/* * Kernel-based Virtual Machine driver for Linux * * This module enables machines with Intel VT-x extensions to run virtual * machines without emulation or binary translation. * * Copyright (C) 2006 Qumranet, Inc. * Copyright 2010 Red Hat, Inc. and/or its affiliates. * * Authors: * Avi Kivity * Yaniv Kamay * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include "irq.h" #include "mmu.h" #include "cpuid.h" #include #include #include #include #include #include #include #include #include #include #include "kvm_cache_regs.h" #include "x86.h" #include #include #include #include #include #include #include #include #include "trace.h" #define __ex(x) __kvm_handle_fault_on_reboot(x) #define __ex_clear(x, reg) \ ____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg) MODULE_AUTHOR("Qumranet"); MODULE_LICENSE("GPL"); static bool __read_mostly enable_vpid = 1; module_param_named(vpid, enable_vpid, bool, 0444); static bool __read_mostly flexpriority_enabled = 1; module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO); static bool __read_mostly enable_ept = 1; module_param_named(ept, enable_ept, bool, S_IRUGO); static bool __read_mostly enable_unrestricted_guest = 1; module_param_named(unrestricted_guest, enable_unrestricted_guest, bool, S_IRUGO); static bool __read_mostly emulate_invalid_guest_state = 0; module_param(emulate_invalid_guest_state, bool, S_IRUGO); static bool __read_mostly vmm_exclusive = 1; module_param(vmm_exclusive, bool, S_IRUGO); static bool __read_mostly yield_on_hlt = 1; module_param(yield_on_hlt, bool, S_IRUGO); static bool __read_mostly fasteoi = 1; module_param(fasteoi, bool, S_IRUGO); /* * If nested=1, nested virtualization is supported, i.e., guests may use * VMX and be a hypervisor for its own guests. If nested=0, guests may not * use VMX instructions. */ static bool __read_mostly nested = 0; module_param(nested, bool, S_IRUGO); #define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST \ (X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD) #define KVM_GUEST_CR0_MASK \ (KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE) #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST \ (X86_CR0_WP | X86_CR0_NE) #define KVM_VM_CR0_ALWAYS_ON \ (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE) #define KVM_CR4_GUEST_OWNED_BITS \ (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \ | X86_CR4_OSXMMEXCPT) #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE) #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE) #define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM)) /* * These 2 parameters are used to config the controls for Pause-Loop Exiting: * ple_gap: upper bound on the amount of time between two successive * executions of PAUSE in a loop. Also indicate if ple enabled. * According to test, this time is usually smaller than 128 cycles. * ple_window: upper bound on the amount of time a guest is allowed to execute * in a PAUSE loop. Tests indicate that most spinlocks are held for * less than 2^12 cycles * Time is measured based on a counter that runs at the same rate as the TSC, * refer SDM volume 3b section 21.6.13 & 22.1.3. */ #define KVM_VMX_DEFAULT_PLE_GAP 128 #define KVM_VMX_DEFAULT_PLE_WINDOW 4096 static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP; module_param(ple_gap, int, S_IRUGO); static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW; module_param(ple_window, int, S_IRUGO); #define NR_AUTOLOAD_MSRS 8 #define VMCS02_POOL_SIZE 1 struct vmcs { u32 revision_id; u32 abort; char data[0]; }; /* * Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also * remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs * loaded on this CPU (so we can clear them if the CPU goes down). */ struct loaded_vmcs { struct vmcs *vmcs; int cpu; int launched; struct list_head loaded_vmcss_on_cpu_link; }; struct shared_msr_entry { unsigned index; u64 data; u64 mask; }; /* * struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a * single nested guest (L2), hence the name vmcs12. Any VMX implementation has * a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is * stored in guest memory specified by VMPTRLD, but is opaque to the guest, * which must access it using VMREAD/VMWRITE/VMCLEAR instructions. * More than one of these structures may exist, if L1 runs multiple L2 guests. * nested_vmx_run() will use the data here to build a vmcs02: a VMCS for the * underlying hardware which will be used to run L2. * This structure is packed to ensure that its layout is identical across * machines (necessary for live migration). * If there are changes in this struct, VMCS12_REVISION must be changed. */ typedef u64 natural_width; struct __packed vmcs12 { /* According to the Intel spec, a VMCS region must start with the * following two fields. Then follow implementation-specific data. */ u32 revision_id; u32 abort; u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */ u32 padding[7]; /* room for future expansion */ u64 io_bitmap_a; u64 io_bitmap_b; u64 msr_bitmap; u64 vm_exit_msr_store_addr; u64 vm_exit_msr_load_addr; u64 vm_entry_msr_load_addr; u64 tsc_offset; u64 virtual_apic_page_addr; u64 apic_access_addr; u64 ept_pointer; u64 guest_physical_address; u64 vmcs_link_pointer; u64 guest_ia32_debugctl; u64 guest_ia32_pat; u64 guest_ia32_efer; u64 guest_ia32_perf_global_ctrl; u64 guest_pdptr0; u64 guest_pdptr1; u64 guest_pdptr2; u64 guest_pdptr3; u64 host_ia32_pat; u64 host_ia32_efer; u64 host_ia32_perf_global_ctrl; u64 padding64[8]; /* room for future expansion */ /* * To allow migration of L1 (complete with its L2 guests) between * machines of different natural widths (32 or 64 bit), we cannot have * unsigned long fields with no explict size. We use u64 (aliased * natural_width) instead. Luckily, x86 is little-endian. */ natural_width cr0_guest_host_mask; natural_width cr4_guest_host_mask; natural_width cr0_read_shadow; natural_width cr4_read_shadow; natural_width cr3_target_value0; natural_width cr3_target_value1; natural_width cr3_target_value2; natural_width cr3_target_value3; natural_width exit_qualification; natural_width guest_linear_address; natural_width guest_cr0; natural_width guest_cr3; natural_width guest_cr4; natural_width guest_es_base; natural_width guest_cs_base; natural_width guest_ss_base; natural_width guest_ds_base; natural_width guest_fs_base; natural_width guest_gs_base; natural_width guest_ldtr_base; natural_width guest_tr_base; natural_width guest_gdtr_base; natural_width guest_idtr_base; natural_width guest_dr7; natural_width guest_rsp; natural_width guest_rip; natural_width guest_rflags; natural_width guest_pending_dbg_exceptions; natural_width guest_sysenter_esp; natural_width guest_sysenter_eip; natural_width host_cr0; natural_width host_cr3; natural_width host_cr4; natural_width host_fs_base; natural_width host_gs_base; natural_width host_tr_base; natural_width host_gdtr_base; natural_width host_idtr_base; natural_width host_ia32_sysenter_esp; natural_width host_ia32_sysenter_eip; natural_width host_rsp; natural_width host_rip; natural_width paddingl[8]; /* room for future expansion */ u32 pin_based_vm_exec_control; u32 cpu_based_vm_exec_control; u32 exception_bitmap; u32 page_fault_error_code_mask; u32 page_fault_error_code_match; u32 cr3_target_count; u32 vm_exit_controls; u32 vm_exit_msr_store_count; u32 vm_exit_msr_load_count; u32 vm_entry_controls; u32 vm_entry_msr_load_count; u32 vm_entry_intr_info_field; u32 vm_entry_exception_error_code; u32 vm_entry_instruction_len; u32 tpr_threshold; u32 secondary_vm_exec_control; u32 vm_instruction_error; u32 vm_exit_reason; u32 vm_exit_intr_info; u32 vm_exit_intr_error_code; u32 idt_vectoring_info_field; u32 idt_vectoring_error_code; u32 vm_exit_instruction_len; u32 vmx_instruction_info; u32 guest_es_limit; u32 guest_cs_limit; u32 guest_ss_limit; u32 guest_ds_limit; u32 guest_fs_limit; u32 guest_gs_limit; u32 guest_ldtr_limit; u32 guest_tr_limit; u32 guest_gdtr_limit; u32 guest_idtr_limit; u32 guest_es_ar_bytes; u32 guest_cs_ar_bytes; u32 guest_ss_ar_bytes; u32 guest_ds_ar_bytes; u32 guest_fs_ar_bytes; u32 guest_gs_ar_bytes; u32 guest_ldtr_ar_bytes; u32 guest_tr_ar_bytes; u32 guest_interruptibility_info; u32 guest_activity_state; u32 guest_sysenter_cs; u32 host_ia32_sysenter_cs; u32 padding32[8]; /* room for future expansion */ u16 virtual_processor_id; u16 guest_es_selector; u16 guest_cs_selector; u16 guest_ss_selector; u16 guest_ds_selector; u16 guest_fs_selector; u16 guest_gs_selector; u16 guest_ldtr_selector; u16 guest_tr_selector; u16 host_es_selector; u16 host_cs_selector; u16 host_ss_selector; u16 host_ds_selector; u16 host_fs_selector; u16 host_gs_selector; u16 host_tr_selector; }; /* * VMCS12_REVISION is an arbitrary id that should be changed if the content or * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and * VMPTRLD verifies that the VMCS region that L1 is loading contains this id. */ #define VMCS12_REVISION 0x11e57ed0 /* * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region * and any VMCS region. Although only sizeof(struct vmcs12) are used by the * current implementation, 4K are reserved to avoid future complications. */ #define VMCS12_SIZE 0x1000 /* Used to remember the last vmcs02 used for some recently used vmcs12s */ struct vmcs02_list { struct list_head list; gpa_t vmptr; struct loaded_vmcs vmcs02; }; /* * The nested_vmx structure is part of vcpu_vmx, and holds information we need * for correct emulation of VMX (i.e., nested VMX) on this vcpu. */ struct nested_vmx { /* Has the level1 guest done vmxon? */ bool vmxon; /* The guest-physical address of the current VMCS L1 keeps for L2 */ gpa_t current_vmptr; /* The host-usable pointer to the above */ struct page *current_vmcs12_page; struct vmcs12 *current_vmcs12; /* vmcs02_list cache of VMCSs recently used to run L2 guests */ struct list_head vmcs02_pool; int vmcs02_num; u64 vmcs01_tsc_offset; /* L2 must run next, and mustn't decide to exit to L1. */ bool nested_run_pending; /* * Guest pages referred to in vmcs02 with host-physical pointers, so * we must keep them pinned while L2 runs. */ struct page *apic_access_page; }; struct vcpu_vmx { struct kvm_vcpu vcpu; unsigned long host_rsp; u8 fail; u8 cpl; bool nmi_known_unmasked; u32 exit_intr_info; u32 idt_vectoring_info; ulong rflags; struct shared_msr_entry *guest_msrs; int nmsrs; int save_nmsrs; #ifdef CONFIG_X86_64 u64 msr_host_kernel_gs_base; u64 msr_guest_kernel_gs_base; #endif /* * loaded_vmcs points to the VMCS currently used in this vcpu. For a * non-nested (L1) guest, it always points to vmcs01. For a nested * guest (L2), it points to a different VMCS. */ struct loaded_vmcs vmcs01; struct loaded_vmcs *loaded_vmcs; bool __launched; /* temporary, used in vmx_vcpu_run */ struct msr_autoload { unsigned nr; struct vmx_msr_entry guest[NR_AUTOLOAD_MSRS]; struct vmx_msr_entry host[NR_AUTOLOAD_MSRS]; } msr_autoload; struct { int loaded; u16 fs_sel, gs_sel, ldt_sel; int gs_ldt_reload_needed; int fs_reload_needed; } host_state; struct { int vm86_active; ulong save_rflags; struct kvm_save_segment { u16 selector; unsigned long base; u32 limit; u32 ar; } tr, es, ds, fs, gs; } rmode; struct { u32 bitmask; /* 4 bits per segment (1 bit per field) */ struct kvm_save_segment seg[8]; } segment_cache; int vpid; bool emulation_required; /* Support for vnmi-less CPUs */ int soft_vnmi_blocked; ktime_t entry_time; s64 vnmi_blocked_time; u32 exit_reason; bool rdtscp_enabled; /* Support for a guest hypervisor (nested VMX) */ struct nested_vmx nested; }; enum segment_cache_field { SEG_FIELD_SEL = 0, SEG_FIELD_BASE = 1, SEG_FIELD_LIMIT = 2, SEG_FIELD_AR = 3, SEG_FIELD_NR = 4 }; static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu) { return container_of(vcpu, struct vcpu_vmx, vcpu); } #define VMCS12_OFFSET(x) offsetof(struct vmcs12, x) #define FIELD(number, name) [number] = VMCS12_OFFSET(name) #define FIELD64(number, name) [number] = VMCS12_OFFSET(name), \ [number##_HIGH] = VMCS12_OFFSET(name)+4 static unsigned short vmcs_field_to_offset_table[] = { FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id), FIELD(GUEST_ES_SELECTOR, guest_es_selector), FIELD(GUEST_CS_SELECTOR, guest_cs_selector), FIELD(GUEST_SS_SELECTOR, guest_ss_selector), FIELD(GUEST_DS_SELECTOR, guest_ds_selector), FIELD(GUEST_FS_SELECTOR, guest_fs_selector), FIELD(GUEST_GS_SELECTOR, guest_gs_selector), FIELD(GUEST_LDTR_SELECTOR, guest_ldtr_selector), FIELD(GUEST_TR_SELECTOR, guest_tr_selector), FIELD(HOST_ES_SELECTOR, host_es_selector), FIELD(HOST_CS_SELECTOR, host_cs_selector), FIELD(HOST_SS_SELECTOR, host_ss_selector), FIELD(HOST_DS_SELECTOR, host_ds_selector), FIELD(HOST_FS_SELECTOR, host_fs_selector), FIELD(HOST_GS_SELECTOR, host_gs_selector), FIELD(HOST_TR_SELECTOR, host_tr_selector), FIELD64(IO_BITMAP_A, io_bitmap_a), FIELD64(IO_BITMAP_B, io_bitmap_b), FIELD64(MSR_BITMAP, msr_bitmap), FIELD64(VM_EXIT_MSR_STORE_ADDR, vm_exit_msr_store_addr), FIELD64(VM_EXIT_MSR_LOAD_ADDR, vm_exit_msr_load_addr), FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr), FIELD64(TSC_OFFSET, tsc_offset), FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr), FIELD64(APIC_ACCESS_ADDR, apic_access_addr), FIELD64(EPT_POINTER, ept_pointer), FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address), FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer), FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl), FIELD64(GUEST_IA32_PAT, guest_ia32_pat), FIELD64(GUEST_IA32_EFER, guest_ia32_efer), FIELD64(GUEST_IA32_PERF_GLOBAL_CTRL, guest_ia32_perf_global_ctrl), FIELD64(GUEST_PDPTR0, guest_pdptr0), FIELD64(GUEST_PDPTR1, guest_pdptr1), FIELD64(GUEST_PDPTR2, guest_pdptr2), FIELD64(GUEST_PDPTR3, guest_pdptr3), FIELD64(HOST_IA32_PAT, host_ia32_pat), FIELD64(HOST_IA32_EFER, host_ia32_efer), FIELD64(HOST_IA32_PERF_GLOBAL_CTRL, host_ia32_perf_global_ctrl), FIELD(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control), FIELD(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control), FIELD(EXCEPTION_BITMAP, exception_bitmap), FIELD(PAGE_FAULT_ERROR_CODE_MASK, page_fault_error_code_mask), FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match), FIELD(CR3_TARGET_COUNT, cr3_target_count), FIELD(VM_EXIT_CONTROLS, vm_exit_controls), FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count), FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count), FIELD(VM_ENTRY_CONTROLS, vm_entry_controls), FIELD(VM_ENTRY_MSR_LOAD_COUNT, vm_entry_msr_load_count), FIELD(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field), FIELD(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code), FIELD(VM_ENTRY_INSTRUCTION_LEN, vm_entry_instruction_len), FIELD(TPR_THRESHOLD, tpr_threshold), FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control), FIELD(VM_INSTRUCTION_ERROR, vm_instruction_error), FIELD(VM_EXIT_REASON, vm_exit_reason), FIELD(VM_EXIT_INTR_INFO, vm_exit_intr_info), FIELD(VM_EXIT_INTR_ERROR_CODE, vm_exit_intr_error_code), FIELD(IDT_VECTORING_INFO_FIELD, idt_vectoring_info_field), FIELD(IDT_VECTORING_ERROR_CODE, idt_vectoring_error_code), FIELD(VM_EXIT_INSTRUCTION_LEN, vm_exit_instruction_len), FIELD(VMX_INSTRUCTION_INFO, vmx_instruction_info), FIELD(GUEST_ES_LIMIT, guest_es_limit), FIELD(GUEST_CS_LIMIT, guest_cs_limit), FIELD(GUEST_SS_LIMIT, guest_ss_limit), FIELD(GUEST_DS_LIMIT, guest_ds_limit), FIELD(GUEST_FS_LIMIT, guest_fs_limit), FIELD(GUEST_GS_LIMIT, guest_gs_limit), FIELD(GUEST_LDTR_LIMIT, guest_ldtr_limit), FIELD(GUEST_TR_LIMIT, guest_tr_limit), FIELD(GUEST_GDTR_LIMIT, guest_gdtr_limit), FIELD(GUEST_IDTR_LIMIT, guest_idtr_limit), FIELD(GUEST_ES_AR_BYTES, guest_es_ar_bytes), FIELD(GUEST_CS_AR_BYTES, guest_cs_ar_bytes), FIELD(GUEST_SS_AR_BYTES, guest_ss_ar_bytes), FIELD(GUEST_DS_AR_BYTES, guest_ds_ar_bytes), FIELD(GUEST_FS_AR_BYTES, guest_fs_ar_bytes), FIELD(GUEST_GS_AR_BYTES, guest_gs_ar_bytes), FIELD(GUEST_LDTR_AR_BYTES, guest_ldtr_ar_bytes), FIELD(GUEST_TR_AR_BYTES, guest_tr_ar_bytes), FIELD(GUEST_INTERRUPTIBILITY_INFO, guest_interruptibility_info), FIELD(GUEST_ACTIVITY_STATE, guest_activity_state), FIELD(GUEST_SYSENTER_CS, guest_sysenter_cs), FIELD(HOST_IA32_SYSENTER_CS, host_ia32_sysenter_cs), FIELD(CR0_GUEST_HOST_MASK, cr0_guest_host_mask), FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask), FIELD(CR0_READ_SHADOW, cr0_read_shadow), FIELD(CR4_READ_SHADOW, cr4_read_shadow), FIELD(CR3_TARGET_VALUE0, cr3_target_value0), FIELD(CR3_TARGET_VALUE1, cr3_target_value1), FIELD(CR3_TARGET_VALUE2, cr3_target_value2), FIELD(CR3_TARGET_VALUE3, cr3_target_value3), FIELD(EXIT_QUALIFICATION, exit_qualification), FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address), FIELD(GUEST_CR0, guest_cr0), FIELD(GUEST_CR3, guest_cr3), FIELD(GUEST_CR4, guest_cr4), FIELD(GUEST_ES_BASE, guest_es_base), FIELD(GUEST_CS_BASE, guest_cs_base), FIELD(GUEST_SS_BASE, guest_ss_base), FIELD(GUEST_DS_BASE, guest_ds_base), FIELD(GUEST_FS_BASE, guest_fs_base), FIELD(GUEST_GS_BASE, guest_gs_base), FIELD(GUEST_LDTR_BASE, guest_ldtr_base), FIELD(GUEST_TR_BASE, guest_tr_base), FIELD(GUEST_GDTR_BASE, guest_gdtr_base), FIELD(GUEST_IDTR_BASE, guest_idtr_base), FIELD(GUEST_DR7, guest_dr7), FIELD(GUEST_RSP, guest_rsp), FIELD(GUEST_RIP, guest_rip), FIELD(GUEST_RFLAGS, guest_rflags), FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions), FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp), FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip), FIELD(HOST_CR0, host_cr0), FIELD(HOST_CR3, host_cr3), FIELD(HOST_CR4, host_cr4), FIELD(HOST_FS_BASE, host_fs_base), FIELD(HOST_GS_BASE, host_gs_base), FIELD(HOST_TR_BASE, host_tr_base), FIELD(HOST_GDTR_BASE, host_gdtr_base), FIELD(HOST_IDTR_BASE, host_idtr_base), FIELD(HOST_IA32_SYSENTER_ESP, host_ia32_sysenter_esp), FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip), FIELD(HOST_RSP, host_rsp), FIELD(HOST_RIP, host_rip), }; static const int max_vmcs_field = ARRAY_SIZE(vmcs_field_to_offset_table); static inline short vmcs_field_to_offset(unsigned long field) { if (field >= max_vmcs_field || vmcs_field_to_offset_table[field] == 0) return -1; return vmcs_field_to_offset_table[field]; } static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu) { return to_vmx(vcpu)->nested.current_vmcs12; } static struct page *nested_get_page(struct kvm_vcpu *vcpu, gpa_t addr) { struct page *page = gfn_to_page(vcpu->kvm, addr >> PAGE_SHIFT); if (is_error_page(page)) { kvm_release_page_clean(page); return NULL; } return page; } static void nested_release_page(struct page *page) { kvm_release_page_dirty(page); } static void nested_release_page_clean(struct page *page) { kvm_release_page_clean(page); } static u64 construct_eptp(unsigned long root_hpa); static void kvm_cpu_vmxon(u64 addr); static void kvm_cpu_vmxoff(void); static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3); static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr); static DEFINE_PER_CPU(struct vmcs *, vmxarea); static DEFINE_PER_CPU(struct vmcs *, current_vmcs); /* * We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed * when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it. */ static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu); static DEFINE_PER_CPU(struct desc_ptr, host_gdt); static unsigned long *vmx_io_bitmap_a; static unsigned long *vmx_io_bitmap_b; static unsigned long *vmx_msr_bitmap_legacy; static unsigned long *vmx_msr_bitmap_longmode; static bool cpu_has_load_ia32_efer; static bool cpu_has_load_perf_global_ctrl; static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS); static DEFINE_SPINLOCK(vmx_vpid_lock); static struct vmcs_config { int size; int order; u32 revision_id; u32 pin_based_exec_ctrl; u32 cpu_based_exec_ctrl; u32 cpu_based_2nd_exec_ctrl; u32 vmexit_ctrl; u32 vmentry_ctrl; } vmcs_config; static struct vmx_capability { u32 ept; u32 vpid; } vmx_capability; #define VMX_SEGMENT_FIELD(seg) \ [VCPU_SREG_##seg] = { \ .selector = GUEST_##seg##_SELECTOR, \ .base = GUEST_##seg##_BASE, \ .limit = GUEST_##seg##_LIMIT, \ .ar_bytes = GUEST_##seg##_AR_BYTES, \ } static struct kvm_vmx_segment_field { unsigned selector; unsigned base; unsigned limit; unsigned ar_bytes; } kvm_vmx_segment_fields[] = { VMX_SEGMENT_FIELD(CS), VMX_SEGMENT_FIELD(DS), VMX_SEGMENT_FIELD(ES), VMX_SEGMENT_FIELD(FS), VMX_SEGMENT_FIELD(GS), VMX_SEGMENT_FIELD(SS), VMX_SEGMENT_FIELD(TR), VMX_SEGMENT_FIELD(LDTR), }; static u64 host_efer; static void ept_save_pdptrs(struct kvm_vcpu *vcpu); /* * Keep MSR_STAR at the end, as setup_msrs() will try to optimize it * away by decrementing the array size. */ static const u32 vmx_msr_index[] = { #ifdef CONFIG_X86_64 MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, #endif MSR_EFER, MSR_TSC_AUX, MSR_STAR, }; #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index) static inline bool is_page_fault(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK); } static inline bool is_no_device(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK); } static inline bool is_invalid_opcode(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK); } static inline bool is_external_interrupt(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK); } static inline bool is_machine_check(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK); } static inline bool cpu_has_vmx_msr_bitmap(void) { return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS; } static inline bool cpu_has_vmx_tpr_shadow(void) { return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW; } static inline bool vm_need_tpr_shadow(struct kvm *kvm) { return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)); } static inline bool cpu_has_secondary_exec_ctrls(void) { return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; } static inline bool cpu_has_vmx_virtualize_apic_accesses(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; } static inline bool cpu_has_vmx_flexpriority(void) { return cpu_has_vmx_tpr_shadow() && cpu_has_vmx_virtualize_apic_accesses(); } static inline bool cpu_has_vmx_ept_execute_only(void) { return vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT; } static inline bool cpu_has_vmx_eptp_uncacheable(void) { return vmx_capability.ept & VMX_EPTP_UC_BIT; } static inline bool cpu_has_vmx_eptp_writeback(void) { return vmx_capability.ept & VMX_EPTP_WB_BIT; } static inline bool cpu_has_vmx_ept_2m_page(void) { return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT; } static inline bool cpu_has_vmx_ept_1g_page(void) { return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT; } static inline bool cpu_has_vmx_ept_4levels(void) { return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT; } static inline bool cpu_has_vmx_invept_individual_addr(void) { return vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT; } static inline bool cpu_has_vmx_invept_context(void) { return vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT; } static inline bool cpu_has_vmx_invept_global(void) { return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT; } static inline bool cpu_has_vmx_invvpid_single(void) { return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT; } static inline bool cpu_has_vmx_invvpid_global(void) { return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT; } static inline bool cpu_has_vmx_ept(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_EPT; } static inline bool cpu_has_vmx_unrestricted_guest(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_UNRESTRICTED_GUEST; } static inline bool cpu_has_vmx_ple(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_PAUSE_LOOP_EXITING; } static inline bool vm_need_virtualize_apic_accesses(struct kvm *kvm) { return flexpriority_enabled && irqchip_in_kernel(kvm); } static inline bool cpu_has_vmx_vpid(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_VPID; } static inline bool cpu_has_vmx_rdtscp(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_RDTSCP; } static inline bool cpu_has_virtual_nmis(void) { return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS; } static inline bool cpu_has_vmx_wbinvd_exit(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_WBINVD_EXITING; } static inline bool report_flexpriority(void) { return flexpriority_enabled; } static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit) { return vmcs12->cpu_based_vm_exec_control & bit; } static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit) { return (vmcs12->cpu_based_vm_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) && (vmcs12->secondary_vm_exec_control & bit); } static inline bool nested_cpu_has_virtual_nmis(struct vmcs12 *vmcs12, struct kvm_vcpu *vcpu) { return vmcs12->pin_based_vm_exec_control & PIN_BASED_VIRTUAL_NMIS; } static inline bool is_exception(u32 intr_info) { return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK)) == (INTR_TYPE_HARD_EXCEPTION | INTR_INFO_VALID_MASK); } static void nested_vmx_vmexit(struct kvm_vcpu *vcpu); static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, u32 reason, unsigned long qualification); static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr) { int i; for (i = 0; i < vmx->nmsrs; ++i) if (vmx_msr_index[vmx->guest_msrs[i].index] == msr) return i; return -1; } static inline void __invvpid(int ext, u16 vpid, gva_t gva) { struct { u64 vpid : 16; u64 rsvd : 48; u64 gva; } operand = { vpid, 0, gva }; asm volatile (__ex(ASM_VMX_INVVPID) /* CF==1 or ZF==1 --> rc = -1 */ "; ja 1f ; ud2 ; 1:" : : "a"(&operand), "c"(ext) : "cc", "memory"); } static inline void __invept(int ext, u64 eptp, gpa_t gpa) { struct { u64 eptp, gpa; } operand = {eptp, gpa}; asm volatile (__ex(ASM_VMX_INVEPT) /* CF==1 or ZF==1 --> rc = -1 */ "; ja 1f ; ud2 ; 1:\n" : : "a" (&operand), "c" (ext) : "cc", "memory"); } static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr) { int i; i = __find_msr_index(vmx, msr); if (i >= 0) return &vmx->guest_msrs[i]; return NULL; } static void vmcs_clear(struct vmcs *vmcs) { u64 phys_addr = __pa(vmcs); u8 error; asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0" : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr) : "cc", "memory"); if (error) printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n", vmcs, phys_addr); } static inline void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs) { vmcs_clear(loaded_vmcs->vmcs); loaded_vmcs->cpu = -1; loaded_vmcs->launched = 0; } static void vmcs_load(struct vmcs *vmcs) { u64 phys_addr = __pa(vmcs); u8 error; asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0" : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr) : "cc", "memory"); if (error) printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n", vmcs, phys_addr); } static void __loaded_vmcs_clear(void *arg) { struct loaded_vmcs *loaded_vmcs = arg; int cpu = raw_smp_processor_id(); if (loaded_vmcs->cpu != cpu) return; /* vcpu migration can race with cpu offline */ if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs) per_cpu(current_vmcs, cpu) = NULL; list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link); loaded_vmcs_init(loaded_vmcs); } static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs) { if (loaded_vmcs->cpu != -1) smp_call_function_single( loaded_vmcs->cpu, __loaded_vmcs_clear, loaded_vmcs, 1); } static inline void vpid_sync_vcpu_single(struct vcpu_vmx *vmx) { if (vmx->vpid == 0) return; if (cpu_has_vmx_invvpid_single()) __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0); } static inline void vpid_sync_vcpu_global(void) { if (cpu_has_vmx_invvpid_global()) __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0); } static inline void vpid_sync_context(struct vcpu_vmx *vmx) { if (cpu_has_vmx_invvpid_single()) vpid_sync_vcpu_single(vmx); else vpid_sync_vcpu_global(); } static inline void ept_sync_global(void) { if (cpu_has_vmx_invept_global()) __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0); } static inline void ept_sync_context(u64 eptp) { if (enable_ept) { if (cpu_has_vmx_invept_context()) __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0); else ept_sync_global(); } } static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa) { if (enable_ept) { if (cpu_has_vmx_invept_individual_addr()) __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR, eptp, gpa); else ept_sync_context(eptp); } } static __always_inline unsigned long vmcs_readl(unsigned long field) { unsigned long value; asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0") : "=a"(value) : "d"(field) : "cc"); return value; } static __always_inline u16 vmcs_read16(unsigned long field) { return vmcs_readl(field); } static __always_inline u32 vmcs_read32(unsigned long field) { return vmcs_readl(field); } static __always_inline u64 vmcs_read64(unsigned long field) { #ifdef CONFIG_X86_64 return vmcs_readl(field); #else return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32); #endif } static noinline void vmwrite_error(unsigned long field, unsigned long value) { printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n", field, value, vmcs_read32(VM_INSTRUCTION_ERROR)); dump_stack(); } static void vmcs_writel(unsigned long field, unsigned long value) { u8 error; asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0" : "=q"(error) : "a"(value), "d"(field) : "cc"); if (unlikely(error)) vmwrite_error(field, value); } static void vmcs_write16(unsigned long field, u16 value) { vmcs_writel(field, value); } static void vmcs_write32(unsigned long field, u32 value) { vmcs_writel(field, value); } static void vmcs_write64(unsigned long field, u64 value) { vmcs_writel(field, value); #ifndef CONFIG_X86_64 asm volatile (""); vmcs_writel(field+1, value >> 32); #endif } static void vmcs_clear_bits(unsigned long field, u32 mask) { vmcs_writel(field, vmcs_readl(field) & ~mask); } static void vmcs_set_bits(unsigned long field, u32 mask) { vmcs_writel(field, vmcs_readl(field) | mask); } static void vmx_segment_cache_clear(struct vcpu_vmx *vmx) { vmx->segment_cache.bitmask = 0; } static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg, unsigned field) { bool ret; u32 mask = 1 << (seg * SEG_FIELD_NR + field); if (!(vmx->vcpu.arch.regs_avail & (1 << VCPU_EXREG_SEGMENTS))) { vmx->vcpu.arch.regs_avail |= (1 << VCPU_EXREG_SEGMENTS); vmx->segment_cache.bitmask = 0; } ret = vmx->segment_cache.bitmask & mask; vmx->segment_cache.bitmask |= mask; return ret; } static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg) { u16 *p = &vmx->segment_cache.seg[seg].selector; if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL)) *p = vmcs_read16(kvm_vmx_segment_fields[seg].selector); return *p; } static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg) { ulong *p = &vmx->segment_cache.seg[seg].base; if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE)) *p = vmcs_readl(kvm_vmx_segment_fields[seg].base); return *p; } static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg) { u32 *p = &vmx->segment_cache.seg[seg].limit; if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT)) *p = vmcs_read32(kvm_vmx_segment_fields[seg].limit); return *p; } static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg) { u32 *p = &vmx->segment_cache.seg[seg].ar; if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR)) *p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes); return *p; } static void update_exception_bitmap(struct kvm_vcpu *vcpu) { u32 eb; eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) | (1u << NM_VECTOR) | (1u << DB_VECTOR); if ((vcpu->guest_debug & (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) == (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) eb |= 1u << BP_VECTOR; if (to_vmx(vcpu)->rmode.vm86_active) eb = ~0; if (enable_ept) eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */ if (vcpu->fpu_active) eb &= ~(1u << NM_VECTOR); /* When we are running a nested L2 guest and L1 specified for it a * certain exception bitmap, we must trap the same exceptions and pass * them to L1. When running L2, we will only handle the exceptions * specified above if L1 did not want them. */ if (is_guest_mode(vcpu)) eb |= get_vmcs12(vcpu)->exception_bitmap; vmcs_write32(EXCEPTION_BITMAP, eb); } static void clear_atomic_switch_msr_special(unsigned long entry, unsigned long exit) { vmcs_clear_bits(VM_ENTRY_CONTROLS, entry); vmcs_clear_bits(VM_EXIT_CONTROLS, exit); } static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr) { unsigned i; struct msr_autoload *m = &vmx->msr_autoload; switch (msr) { case MSR_EFER: if (cpu_has_load_ia32_efer) { clear_atomic_switch_msr_special(VM_ENTRY_LOAD_IA32_EFER, VM_EXIT_LOAD_IA32_EFER); return; } break; case MSR_CORE_PERF_GLOBAL_CTRL: if (cpu_has_load_perf_global_ctrl) { clear_atomic_switch_msr_special( VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL, VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL); return; } break; } for (i = 0; i < m->nr; ++i) if (m->guest[i].index == msr) break; if (i == m->nr) return; --m->nr; m->guest[i] = m->guest[m->nr]; m->host[i] = m->host[m->nr]; vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr); vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr); } static void add_atomic_switch_msr_special(unsigned long entry, unsigned long exit, unsigned long guest_val_vmcs, unsigned long host_val_vmcs, u64 guest_val, u64 host_val) { vmcs_write64(guest_val_vmcs, guest_val); vmcs_write64(host_val_vmcs, host_val); vmcs_set_bits(VM_ENTRY_CONTROLS, entry); vmcs_set_bits(VM_EXIT_CONTROLS, exit); } static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, u64 guest_val, u64 host_val) { unsigned i; struct msr_autoload *m = &vmx->msr_autoload; switch (msr) { case MSR_EFER: if (cpu_has_load_ia32_efer) { add_atomic_switch_msr_special(VM_ENTRY_LOAD_IA32_EFER, VM_EXIT_LOAD_IA32_EFER, GUEST_IA32_EFER, HOST_IA32_EFER, guest_val, host_val); return; } break; case MSR_CORE_PERF_GLOBAL_CTRL: if (cpu_has_load_perf_global_ctrl) { add_atomic_switch_msr_special( VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL, VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL, GUEST_IA32_PERF_GLOBAL_CTRL, HOST_IA32_PERF_GLOBAL_CTRL, guest_val, host_val); return; } break; } for (i = 0; i < m->nr; ++i) if (m->guest[i].index == msr) break; if (i == NR_AUTOLOAD_MSRS) { printk_once(KERN_WARNING"Not enough mst switch entries. " "Can't add msr %x\n", msr); return; } else if (i == m->nr) { ++m->nr; vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr); vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr); } m->guest[i].index = msr; m->guest[i].value = guest_val; m->host[i].index = msr; m->host[i].value = host_val; } static void reload_tss(void) { /* * VT restores TR but not its size. Useless. */ struct desc_ptr *gdt = &__get_cpu_var(host_gdt); struct desc_struct *descs; descs = (void *)gdt->address; descs[GDT_ENTRY_TSS].type = 9; /* available TSS */ load_TR_desc(); } static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) { u64 guest_efer; u64 ignore_bits; guest_efer = vmx->vcpu.arch.efer; /* * NX is emulated; LMA and LME handled by hardware; SCE meaninless * outside long mode */ ignore_bits = EFER_NX | EFER_SCE; #ifdef CONFIG_X86_64 ignore_bits |= EFER_LMA | EFER_LME; /* SCE is meaningful only in long mode on Intel */ if (guest_efer & EFER_LMA) ignore_bits &= ~(u64)EFER_SCE; #endif guest_efer &= ~ignore_bits; guest_efer |= host_efer & ignore_bits; vmx->guest_msrs[efer_offset].data = guest_efer; vmx->guest_msrs[efer_offset].mask = ~ignore_bits; clear_atomic_switch_msr(vmx, MSR_EFER); /* On ept, can't emulate nx, and must switch nx atomically */ if (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX)) { guest_efer = vmx->vcpu.arch.efer; if (!(guest_efer & EFER_LMA)) guest_efer &= ~EFER_LME; add_atomic_switch_msr(vmx, MSR_EFER, guest_efer, host_efer); return false; } return true; } static unsigned long segment_base(u16 selector) { struct desc_ptr *gdt = &__get_cpu_var(host_gdt); struct desc_struct *d; unsigned long table_base; unsigned long v; if (!(selector & ~3)) return 0; table_base = gdt->address; if (selector & 4) { /* from ldt */ u16 ldt_selector = kvm_read_ldt(); if (!(ldt_selector & ~3)) return 0; table_base = segment_base(ldt_selector); } d = (struct desc_struct *)(table_base + (selector & ~7)); v = get_desc_base(d); #ifdef CONFIG_X86_64 if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11)) v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32; #endif return v; } static inline unsigned long kvm_read_tr_base(void) { u16 tr; asm("str %0" : "=g"(tr)); return segment_base(tr); } static void vmx_save_host_state(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); int i; if (vmx->host_state.loaded) return; vmx->host_state.loaded = 1; /* * Set host fs and gs selectors. Unfortunately, 22.2.3 does not * allow segment selectors with cpl > 0 or ti == 1. */ vmx->host_state.ldt_sel = kvm_read_ldt(); vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel; savesegment(fs, vmx->host_state.fs_sel); if (!(vmx->host_state.fs_sel & 7)) { vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel); vmx->host_state.fs_reload_needed = 0; } else { vmcs_write16(HOST_FS_SELECTOR, 0); vmx->host_state.fs_reload_needed = 1; } savesegment(gs, vmx->host_state.gs_sel); if (!(vmx->host_state.gs_sel & 7)) vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel); else { vmcs_write16(HOST_GS_SELECTOR, 0); vmx->host_state.gs_ldt_reload_needed = 1; } #ifdef CONFIG_X86_64 vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE)); vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE)); #else vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel)); vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel)); #endif #ifdef CONFIG_X86_64 rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); if (is_long_mode(&vmx->vcpu)) wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); #endif for (i = 0; i < vmx->save_nmsrs; ++i) kvm_set_shared_msr(vmx->guest_msrs[i].index, vmx->guest_msrs[i].data, vmx->guest_msrs[i].mask); } static void __vmx_load_host_state(struct vcpu_vmx *vmx) { if (!vmx->host_state.loaded) return; ++vmx->vcpu.stat.host_state_reload; vmx->host_state.loaded = 0; #ifdef CONFIG_X86_64 if (is_long_mode(&vmx->vcpu)) rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); #endif if (vmx->host_state.gs_ldt_reload_needed) { kvm_load_ldt(vmx->host_state.ldt_sel); #ifdef CONFIG_X86_64 load_gs_index(vmx->host_state.gs_sel); #else loadsegment(gs, vmx->host_state.gs_sel); #endif } if (vmx->host_state.fs_reload_needed) loadsegment(fs, vmx->host_state.fs_sel); reload_tss(); #ifdef CONFIG_X86_64 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); #endif if (user_has_fpu()) clts(); load_gdt(&__get_cpu_var(host_gdt)); } static void vmx_load_host_state(struct vcpu_vmx *vmx) { preempt_disable(); __vmx_load_host_state(vmx); preempt_enable(); } /* * Switches to specified vcpu, until a matching vcpu_put(), but assumes * vcpu mutex is already taken. */ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); if (!vmm_exclusive) kvm_cpu_vmxon(phys_addr); else if (vmx->loaded_vmcs->cpu != cpu) loaded_vmcs_clear(vmx->loaded_vmcs); if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) { per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs; vmcs_load(vmx->loaded_vmcs->vmcs); } if (vmx->loaded_vmcs->cpu != cpu) { struct desc_ptr *gdt = &__get_cpu_var(host_gdt); unsigned long sysenter_esp; kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); local_irq_disable(); list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link, &per_cpu(loaded_vmcss_on_cpu, cpu)); local_irq_enable(); /* * Linux uses per-cpu TSS and GDT, so set these when switching * processors. */ vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */ vmcs_writel(HOST_GDTR_BASE, gdt->address); /* 22.2.4 */ rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp); vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */ vmx->loaded_vmcs->cpu = cpu; } } static void vmx_vcpu_put(struct kvm_vcpu *vcpu) { __vmx_load_host_state(to_vmx(vcpu)); if (!vmm_exclusive) { __loaded_vmcs_clear(to_vmx(vcpu)->loaded_vmcs); vcpu->cpu = -1; kvm_cpu_vmxoff(); } } static void vmx_fpu_activate(struct kvm_vcpu *vcpu) { ulong cr0; if (vcpu->fpu_active) return; vcpu->fpu_active = 1; cr0 = vmcs_readl(GUEST_CR0); cr0 &= ~(X86_CR0_TS | X86_CR0_MP); cr0 |= kvm_read_cr0_bits(vcpu, X86_CR0_TS | X86_CR0_MP); vmcs_writel(GUEST_CR0, cr0); update_exception_bitmap(vcpu); vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS; if (is_guest_mode(vcpu)) vcpu->arch.cr0_guest_owned_bits &= ~get_vmcs12(vcpu)->cr0_guest_host_mask; vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); } static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu); /* * Return the cr0 value that a nested guest would read. This is a combination * of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by * its hypervisor (cr0_read_shadow). */ static inline unsigned long nested_read_cr0(struct vmcs12 *fields) { return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) | (fields->cr0_read_shadow & fields->cr0_guest_host_mask); } static inline unsigned long nested_read_cr4(struct vmcs12 *fields) { return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) | (fields->cr4_read_shadow & fields->cr4_guest_host_mask); } static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu) { /* Note that there is no vcpu->fpu_active = 0 here. The caller must * set this *before* calling this function. */ vmx_decache_cr0_guest_bits(vcpu); vmcs_set_bits(GUEST_CR0, X86_CR0_TS | X86_CR0_MP); update_exception_bitmap(vcpu); vcpu->arch.cr0_guest_owned_bits = 0; vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); if (is_guest_mode(vcpu)) { /* * L1's specified read shadow might not contain the TS bit, * so now that we turned on shadowing of this bit, we need to * set this bit of the shadow. Like in nested_vmx_run we need * nested_read_cr0(vmcs12), but vmcs12->guest_cr0 is not yet * up-to-date here because we just decached cr0.TS (and we'll * only update vmcs12->guest_cr0 on nested exit). */ struct vmcs12 *vmcs12 = get_vmcs12(vcpu); vmcs12->guest_cr0 = (vmcs12->guest_cr0 & ~X86_CR0_TS) | (vcpu->arch.cr0 & X86_CR0_TS); vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12)); } else vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0); } static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu) { unsigned long rflags, save_rflags; if (!test_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail)) { __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail); rflags = vmcs_readl(GUEST_RFLAGS); if (to_vmx(vcpu)->rmode.vm86_active) { rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS; save_rflags = to_vmx(vcpu)->rmode.save_rflags; rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS; } to_vmx(vcpu)->rflags = rflags; } return to_vmx(vcpu)->rflags; } static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) { __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail); __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail); to_vmx(vcpu)->rflags = rflags; if (to_vmx(vcpu)->rmode.vm86_active) { to_vmx(vcpu)->rmode.save_rflags = rflags; rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; } vmcs_writel(GUEST_RFLAGS, rflags); } static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) { u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); int ret = 0; if (interruptibility & GUEST_INTR_STATE_STI) ret |= KVM_X86_SHADOW_INT_STI; if (interruptibility & GUEST_INTR_STATE_MOV_SS) ret |= KVM_X86_SHADOW_INT_MOV_SS; return ret & mask; } static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) { u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); u32 interruptibility = interruptibility_old; interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS); if (mask & KVM_X86_SHADOW_INT_MOV_SS) interruptibility |= GUEST_INTR_STATE_MOV_SS; else if (mask & KVM_X86_SHADOW_INT_STI) interruptibility |= GUEST_INTR_STATE_STI; if ((interruptibility != interruptibility_old)) vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility); } static void skip_emulated_instruction(struct kvm_vcpu *vcpu) { unsigned long rip; rip = kvm_rip_read(vcpu); rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN); kvm_rip_write(vcpu, rip); /* skipping an emulated instruction also counts */ vmx_set_interrupt_shadow(vcpu, 0); } static void vmx_clear_hlt(struct kvm_vcpu *vcpu) { /* Ensure that we clear the HLT state in the VMCS. We don't need to * explicitly skip the instruction because if the HLT state is set, then * the instruction is already executing and RIP has already been * advanced. */ if (!yield_on_hlt && vmcs_read32(GUEST_ACTIVITY_STATE) == GUEST_ACTIVITY_HLT) vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE); } /* * KVM wants to inject page-faults which it got to the guest. This function * checks whether in a nested guest, we need to inject them to L1 or L2. * This function assumes it is called with the exit reason in vmcs02 being * a #PF exception (this is the only case in which KVM injects a #PF when L2 * is running). */ static int nested_pf_handled(struct kvm_vcpu *vcpu) { struct vmcs12 *vmcs12 = get_vmcs12(vcpu); /* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */ if (!(vmcs12->exception_bitmap & PF_VECTOR)) return 0; nested_vmx_vmexit(vcpu); return 1; } static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr, bool has_error_code, u32 error_code, bool reinject) { struct vcpu_vmx *vmx = to_vmx(vcpu); u32 intr_info = nr | INTR_INFO_VALID_MASK; if (nr == PF_VECTOR && is_guest_mode(vcpu) && nested_pf_handled(vcpu)) return; if (has_error_code) { vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code); intr_info |= INTR_INFO_DELIVER_CODE_MASK; } if (vmx->rmode.vm86_active) { int inc_eip = 0; if (kvm_exception_is_soft(nr)) inc_eip = vcpu->arch.event_exit_inst_len; if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE) kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); return; } if (kvm_exception_is_soft(nr)) { vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, vmx->vcpu.arch.event_exit_inst_len); intr_info |= INTR_TYPE_SOFT_EXCEPTION; } else intr_info |= INTR_TYPE_HARD_EXCEPTION; vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); vmx_clear_hlt(vcpu); } static bool vmx_rdtscp_supported(void) { return cpu_has_vmx_rdtscp(); } /* * Swap MSR entry in host/guest MSR entry array. */ static void move_msr_up(struct vcpu_vmx *vmx, int from, int to) { struct shared_msr_entry tmp; tmp = vmx->guest_msrs[to]; vmx->guest_msrs[to] = vmx->guest_msrs[from]; vmx->guest_msrs[from] = tmp; } /* * Set up the vmcs to automatically save and restore system * msrs. Don't touch the 64-bit msrs if the guest is in legacy * mode, as fiddling with msrs is very expensive. */ static void setup_msrs(struct vcpu_vmx *vmx) { int save_nmsrs, index; unsigned long *msr_bitmap; save_nmsrs = 0; #ifdef CONFIG_X86_64 if (is_long_mode(&vmx->vcpu)) { index = __find_msr_index(vmx, MSR_SYSCALL_MASK); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); index = __find_msr_index(vmx, MSR_LSTAR); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); index = __find_msr_index(vmx, MSR_CSTAR); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); index = __find_msr_index(vmx, MSR_TSC_AUX); if (index >= 0 && vmx->rdtscp_enabled) move_msr_up(vmx, index, save_nmsrs++); /* * MSR_STAR is only needed on long mode guests, and only * if efer.sce is enabled. */ index = __find_msr_index(vmx, MSR_STAR); if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE)) move_msr_up(vmx, index, save_nmsrs++); } #endif index = __find_msr_index(vmx, MSR_EFER); if (index >= 0 && update_transition_efer(vmx, index)) move_msr_up(vmx, index, save_nmsrs++); vmx->save_nmsrs = save_nmsrs; if (cpu_has_vmx_msr_bitmap()) { if (is_long_mode(&vmx->vcpu)) msr_bitmap = vmx_msr_bitmap_longmode; else msr_bitmap = vmx_msr_bitmap_legacy; vmcs_write64(MSR_BITMAP, __pa(msr_bitmap)); } } /* * reads and returns guest's timestamp counter "register" * guest_tsc = host_tsc + tsc_offset -- 21.3 */ static u64 guest_read_tsc(void) { u64 host_tsc, tsc_offset; rdtscll(host_tsc); tsc_offset = vmcs_read64(TSC_OFFSET); return host_tsc + tsc_offset; } /* * Like guest_read_tsc, but always returns L1's notion of the timestamp * counter, even if a nested guest (L2) is currently running. */ u64 vmx_read_l1_tsc(struct kvm_vcpu *vcpu) { u64 host_tsc, tsc_offset; rdtscll(host_tsc); tsc_offset = is_guest_mode(vcpu) ? to_vmx(vcpu)->nested.vmcs01_tsc_offset : vmcs_read64(TSC_OFFSET); return host_tsc + tsc_offset; } /* * Empty call-back. Needs to be implemented when VMX enables the SET_TSC_KHZ * ioctl. In this case the call-back should update internal vmx state to make * the changes effective. */ static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz) { /* Nothing to do here */ } /* * writes 'offset' into guest's timestamp counter offset register */ static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) { if (is_guest_mode(vcpu)) { /* * We're here if L1 chose not to trap WRMSR to TSC. According * to the spec, this should set L1's TSC; The offset that L1 * set for L2 remains unchanged, and still needs to be added * to the newly set TSC to get L2's TSC. */ struct vmcs12 *vmcs12; to_vmx(vcpu)->nested.vmcs01_tsc_offset = offset; /* recalculate vmcs02.TSC_OFFSET: */ vmcs12 = get_vmcs12(vcpu); vmcs_write64(TSC_OFFSET, offset + (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ? vmcs12->tsc_offset : 0)); } else { vmcs_write64(TSC_OFFSET, offset); } } static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment) { u64 offset = vmcs_read64(TSC_OFFSET); vmcs_write64(TSC_OFFSET, offset + adjustment); if (is_guest_mode(vcpu)) { /* Even when running L2, the adjustment needs to apply to L1 */ to_vmx(vcpu)->nested.vmcs01_tsc_offset += adjustment; } } static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) { return target_tsc - native_read_tsc(); } static bool guest_cpuid_has_vmx(struct kvm_vcpu *vcpu) { struct kvm_cpuid_entry2 *best = kvm_find_cpuid_entry(vcpu, 1, 0); return best && (best->ecx & (1 << (X86_FEATURE_VMX & 31))); } /* * nested_vmx_allowed() checks whether a guest should be allowed to use VMX * instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for * all guests if the "nested" module option is off, and can also be disabled * for a single guest by disabling its VMX cpuid bit. */ static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu) { return nested && guest_cpuid_has_vmx(vcpu); } /* * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be * returned for the various VMX controls MSRs when nested VMX is enabled. * The same values should also be used to verify that vmcs12 control fields are * valid during nested entry from L1 to L2. * Each of these control msrs has a low and high 32-bit half: A low bit is on * if the corresponding bit in the (32-bit) control field *must* be on, and a * bit in the high half is on if the corresponding bit in the control field * may be on. See also vmx_control_verify(). * TODO: allow these variables to be modified (downgraded) by module options * or other means. */ static u32 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high; static u32 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high; static u32 nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high; static u32 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high; static u32 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high; static __init void nested_vmx_setup_ctls_msrs(void) { /* * Note that as a general rule, the high half of the MSRs (bits in * the control fields which may be 1) should be initialized by the * intersection of the underlying hardware's MSR (i.e., features which * can be supported) and the list of features we want to expose - * because they are known to be properly supported in our code. * Also, usually, the low half of the MSRs (bits which must be 1) can * be set to 0, meaning that L1 may turn off any of these bits. The * reason is that if one of these bits is necessary, it will appear * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control * fields of vmcs01 and vmcs02, will turn these bits off - and * nested_vmx_exit_handled() will not pass related exits to L1. * These rules have exceptions below. */ /* pin-based controls */ /* * According to the Intel spec, if bit 55 of VMX_BASIC is off (as it is * in our case), bits 1, 2 and 4 (i.e., 0x16) must be 1 in this MSR. */ nested_vmx_pinbased_ctls_low = 0x16 ; nested_vmx_pinbased_ctls_high = 0x16 | PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING | PIN_BASED_VIRTUAL_NMIS; /* exit controls */ nested_vmx_exit_ctls_low = 0; /* Note that guest use of VM_EXIT_ACK_INTR_ON_EXIT is not supported. */ #ifdef CONFIG_X86_64 nested_vmx_exit_ctls_high = VM_EXIT_HOST_ADDR_SPACE_SIZE; #else nested_vmx_exit_ctls_high = 0; #endif /* entry controls */ rdmsr(MSR_IA32_VMX_ENTRY_CTLS, nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high); nested_vmx_entry_ctls_low = 0; nested_vmx_entry_ctls_high &= VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_IA32E_MODE; /* cpu-based controls */ rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high); nested_vmx_procbased_ctls_low = 0; nested_vmx_procbased_ctls_high &= CPU_BASED_VIRTUAL_INTR_PENDING | CPU_BASED_USE_TSC_OFFSETING | CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING | CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING | #ifdef CONFIG_X86_64 CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING | #endif CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING | CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING | CPU_BASED_RDPMC_EXITING | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; /* * We can allow some features even when not supported by the * hardware. For example, L1 can specify an MSR bitmap - and we * can use it to avoid exits to L1 - even when L0 runs L2 * without MSR bitmaps. */ nested_vmx_procbased_ctls_high |= CPU_BASED_USE_MSR_BITMAPS; /* secondary cpu-based controls */ rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2, nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high); nested_vmx_secondary_ctls_low = 0; nested_vmx_secondary_ctls_high &= SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; } static inline bool vmx_control_verify(u32 control, u32 low, u32 high) { /* * Bits 0 in high must be 0, and bits 1 in low must be 1. */ return ((control & high) | low) == control; } static inline u64 vmx_control_msr(u32 low, u32 high) { return low | ((u64)high << 32); } /* * If we allow our guest to use VMX instructions (i.e., nested VMX), we should * also let it use VMX-specific MSRs. * vmx_get_vmx_msr() and vmx_set_vmx_msr() return 1 when we handled a * VMX-specific MSR, or 0 when we haven't (and the caller should handle it * like all other MSRs). */ static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) { if (!nested_vmx_allowed(vcpu) && msr_index >= MSR_IA32_VMX_BASIC && msr_index <= MSR_IA32_VMX_TRUE_ENTRY_CTLS) { /* * According to the spec, processors which do not support VMX * should throw a #GP(0) when VMX capability MSRs are read. */ kvm_queue_exception_e(vcpu, GP_VECTOR, 0); return 1; } switch (msr_index) { case MSR_IA32_FEATURE_CONTROL: *pdata = 0; break; case MSR_IA32_VMX_BASIC: /* * This MSR reports some information about VMX support. We * should return information about the VMX we emulate for the * guest, and the VMCS structure we give it - not about the * VMX support of the underlying hardware. */ *pdata = VMCS12_REVISION | ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) | (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT); break; case MSR_IA32_VMX_TRUE_PINBASED_CTLS: case MSR_IA32_VMX_PINBASED_CTLS: *pdata = vmx_control_msr(nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high); break; case MSR_IA32_VMX_TRUE_PROCBASED_CTLS: case MSR_IA32_VMX_PROCBASED_CTLS: *pdata = vmx_control_msr(nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high); break; case MSR_IA32_VMX_TRUE_EXIT_CTLS: case MSR_IA32_VMX_EXIT_CTLS: *pdata = vmx_control_msr(nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high); break; case MSR_IA32_VMX_TRUE_ENTRY_CTLS: case MSR_IA32_VMX_ENTRY_CTLS: *pdata = vmx_control_msr(nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high); break; case MSR_IA32_VMX_MISC: *pdata = 0; break; /* * These MSRs specify bits which the guest must keep fixed (on or off) * while L1 is in VMXON mode (in L1's root mode, or running an L2). * We picked the standard core2 setting. */ #define VMXON_CR0_ALWAYSON (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE) #define VMXON_CR4_ALWAYSON X86_CR4_VMXE case MSR_IA32_VMX_CR0_FIXED0: *pdata = VMXON_CR0_ALWAYSON; break; case MSR_IA32_VMX_CR0_FIXED1: *pdata = -1ULL; break; case MSR_IA32_VMX_CR4_FIXED0: *pdata = VMXON_CR4_ALWAYSON; break; case MSR_IA32_VMX_CR4_FIXED1: *pdata = -1ULL; break; case MSR_IA32_VMX_VMCS_ENUM: *pdata = 0x1f; break; case MSR_IA32_VMX_PROCBASED_CTLS2: *pdata = vmx_control_msr(nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high); break; case MSR_IA32_VMX_EPT_VPID_CAP: /* Currently, no nested ept or nested vpid */ *pdata = 0; break; default: return 0; } return 1; } static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) { if (!nested_vmx_allowed(vcpu)) return 0; if (msr_index == MSR_IA32_FEATURE_CONTROL) /* TODO: the right thing. */ return 1; /* * No need to treat VMX capability MSRs specially: If we don't handle * them, handle_wrmsr will #GP(0), which is correct (they are readonly) */ return 0; } /* * Reads an msr value (of 'msr_index') into 'pdata'. * Returns 0 on success, non-0 otherwise. * Assumes vcpu_load() was already called. */ static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) { u64 data; struct shared_msr_entry *msr; if (!pdata) { printk(KERN_ERR "BUG: get_msr called with NULL pdata\n"); return -EINVAL; } switch (msr_index) { #ifdef CONFIG_X86_64 case MSR_FS_BASE: data = vmcs_readl(GUEST_FS_BASE); break; case MSR_GS_BASE: data = vmcs_readl(GUEST_GS_BASE); break; case MSR_KERNEL_GS_BASE: vmx_load_host_state(to_vmx(vcpu)); data = to_vmx(vcpu)->msr_guest_kernel_gs_base; break; #endif case MSR_EFER: return kvm_get_msr_common(vcpu, msr_index, pdata); case MSR_IA32_TSC: data = guest_read_tsc(); break; case MSR_IA32_SYSENTER_CS: data = vmcs_read32(GUEST_SYSENTER_CS); break; case MSR_IA32_SYSENTER_EIP: data = vmcs_readl(GUEST_SYSENTER_EIP); break; case MSR_IA32_SYSENTER_ESP: data = vmcs_readl(GUEST_SYSENTER_ESP); break; case MSR_TSC_AUX: if (!to_vmx(vcpu)->rdtscp_enabled) return 1; /* Otherwise falls through */ default: if (vmx_get_vmx_msr(vcpu, msr_index, pdata)) return 0; msr = find_msr_entry(to_vmx(vcpu), msr_index); if (msr) { data = msr->data; break; } return kvm_get_msr_common(vcpu, msr_index, pdata); } *pdata = data; return 0; } /* * Writes msr value into into the appropriate "register". * Returns 0 on success, non-0 otherwise. * Assumes vcpu_load() was already called. */ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct shared_msr_entry *msr; int ret = 0; switch (msr_index) { case MSR_EFER: ret = kvm_set_msr_common(vcpu, msr_index, data); break; #ifdef CONFIG_X86_64 case MSR_FS_BASE: vmx_segment_cache_clear(vmx); vmcs_writel(GUEST_FS_BASE, data); break; case MSR_GS_BASE: vmx_segment_cache_clear(vmx); vmcs_writel(GUEST_GS_BASE, data); break; case MSR_KERNEL_GS_BASE: vmx_load_host_state(vmx); vmx->msr_guest_kernel_gs_base = data; break; #endif case MSR_IA32_SYSENTER_CS: vmcs_write32(GUEST_SYSENTER_CS, data); break; case MSR_IA32_SYSENTER_EIP: vmcs_writel(GUEST_SYSENTER_EIP, data); break; case MSR_IA32_SYSENTER_ESP: vmcs_writel(GUEST_SYSENTER_ESP, data); break; case MSR_IA32_TSC: kvm_write_tsc(vcpu, data); break; case MSR_IA32_CR_PAT: if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { vmcs_write64(GUEST_IA32_PAT, data); vcpu->arch.pat = data; break; } ret = kvm_set_msr_common(vcpu, msr_index, data); break; case MSR_TSC_AUX: if (!vmx->rdtscp_enabled) return 1; /* Check reserved bit, higher 32 bits should be zero */ if ((data >> 32) != 0) return 1; /* Otherwise falls through */ default: if (vmx_set_vmx_msr(vcpu, msr_index, data)) break; msr = find_msr_entry(vmx, msr_index); if (msr) { msr->data = data; break; } ret = kvm_set_msr_common(vcpu, msr_index, data); } return ret; } static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) { __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); switch (reg) { case VCPU_REGS_RSP: vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); break; case VCPU_REGS_RIP: vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP); break; case VCPU_EXREG_PDPTR: if (enable_ept) ept_save_pdptrs(vcpu); break; default: break; } } static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) { if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]); else vmcs_writel(GUEST_DR7, vcpu->arch.dr7); update_exception_bitmap(vcpu); } static __init int cpu_has_kvm_support(void) { return cpu_has_vmx(); } static __init int vmx_disabled_by_bios(void) { u64 msr; rdmsrl(MSR_IA32_FEATURE_CONTROL, msr); if (msr & FEATURE_CONTROL_LOCKED) { /* launched w/ TXT and VMX disabled */ if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) && tboot_enabled()) return 1; /* launched w/o TXT and VMX only enabled w/ TXT */ if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) && !tboot_enabled()) { printk(KERN_WARNING "kvm: disable TXT in the BIOS or " "activate TXT before enabling KVM\n"); return 1; } /* launched w/o TXT and VMX disabled */ if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) && !tboot_enabled()) return 1; } return 0; } static void kvm_cpu_vmxon(u64 addr) { asm volatile (ASM_VMX_VMXON_RAX : : "a"(&addr), "m"(addr) : "memory", "cc"); } static int hardware_enable(void *garbage) { int cpu = raw_smp_processor_id(); u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); u64 old, test_bits; if (read_cr4() & X86_CR4_VMXE) return -EBUSY; INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu)); rdmsrl(MSR_IA32_FEATURE_CONTROL, old); test_bits = FEATURE_CONTROL_LOCKED; test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; if (tboot_enabled()) test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX; if ((old & test_bits) != test_bits) { /* enable and lock */ wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits); } write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */ if (vmm_exclusive) { kvm_cpu_vmxon(phys_addr); ept_sync_global(); } store_gdt(&__get_cpu_var(host_gdt)); return 0; } static void vmclear_local_loaded_vmcss(void) { int cpu = raw_smp_processor_id(); struct loaded_vmcs *v, *n; list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu), loaded_vmcss_on_cpu_link) __loaded_vmcs_clear(v); } /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot() * tricks. */ static void kvm_cpu_vmxoff(void) { asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc"); } static void hardware_disable(void *garbage) { if (vmm_exclusive) { vmclear_local_loaded_vmcss(); kvm_cpu_vmxoff(); } write_cr4(read_cr4() & ~X86_CR4_VMXE); } static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt, u32 msr, u32 *result) { u32 vmx_msr_low, vmx_msr_high; u32 ctl = ctl_min | ctl_opt; rdmsr(msr, vmx_msr_low, vmx_msr_high); ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */ ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */ /* Ensure minimum (required) set of control bits are supported. */ if (ctl_min & ~ctl) return -EIO; *result = ctl; return 0; } static __init bool allow_1_setting(u32 msr, u32 ctl) { u32 vmx_msr_low, vmx_msr_high; rdmsr(msr, vmx_msr_low, vmx_msr_high); return vmx_msr_high & ctl; } static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf) { u32 vmx_msr_low, vmx_msr_high; u32 min, opt, min2, opt2; u32 _pin_based_exec_control = 0; u32 _cpu_based_exec_control = 0; u32 _cpu_based_2nd_exec_control = 0; u32 _vmexit_control = 0; u32 _vmentry_control = 0; min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING; opt = PIN_BASED_VIRTUAL_NMIS; if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS, &_pin_based_exec_control) < 0) return -EIO; min = #ifdef CONFIG_X86_64 CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING | #endif CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING | CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MOV_DR_EXITING | CPU_BASED_USE_TSC_OFFSETING | CPU_BASED_MWAIT_EXITING | CPU_BASED_MONITOR_EXITING | CPU_BASED_INVLPG_EXITING | CPU_BASED_RDPMC_EXITING; if (yield_on_hlt) min |= CPU_BASED_HLT_EXITING; opt = CPU_BASED_TPR_SHADOW | CPU_BASED_USE_MSR_BITMAPS | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS, &_cpu_based_exec_control) < 0) return -EIO; #ifdef CONFIG_X86_64 if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING & ~CPU_BASED_CR8_STORE_EXITING; #endif if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) { min2 = 0; opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | SECONDARY_EXEC_WBINVD_EXITING | SECONDARY_EXEC_ENABLE_VPID | SECONDARY_EXEC_ENABLE_EPT | SECONDARY_EXEC_UNRESTRICTED_GUEST | SECONDARY_EXEC_PAUSE_LOOP_EXITING | SECONDARY_EXEC_RDTSCP; if (adjust_vmx_controls(min2, opt2, MSR_IA32_VMX_PROCBASED_CTLS2, &_cpu_based_2nd_exec_control) < 0) return -EIO; } #ifndef CONFIG_X86_64 if (!(_cpu_based_2nd_exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW; #endif if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) { /* CR3 accesses and invlpg don't need to cause VM Exits when EPT enabled */ _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING | CPU_BASED_INVLPG_EXITING); rdmsr(MSR_IA32_VMX_EPT_VPID_CAP, vmx_capability.ept, vmx_capability.vpid); } min = 0; #ifdef CONFIG_X86_64 min |= VM_EXIT_HOST_ADDR_SPACE_SIZE; #endif opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT; if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS, &_vmexit_control) < 0) return -EIO; min = 0; opt = VM_ENTRY_LOAD_IA32_PAT; if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS, &_vmentry_control) < 0) return -EIO; rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high); /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */ if ((vmx_msr_high & 0x1fff) > PAGE_SIZE) return -EIO; #ifdef CONFIG_X86_64 /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */ if (vmx_msr_high & (1u<<16)) return -EIO; #endif /* Require Write-Back (WB) memory type for VMCS accesses. */ if (((vmx_msr_high >> 18) & 15) != 6) return -EIO; vmcs_conf->size = vmx_msr_high & 0x1fff; vmcs_conf->order = get_order(vmcs_config.size); vmcs_conf->revision_id = vmx_msr_low; vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control; vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control; vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control; vmcs_conf->vmexit_ctrl = _vmexit_control; vmcs_conf->vmentry_ctrl = _vmentry_control; cpu_has_load_ia32_efer = allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS, VM_ENTRY_LOAD_IA32_EFER) && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS, VM_EXIT_LOAD_IA32_EFER); cpu_has_load_perf_global_ctrl = allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS, VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS, VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL); /* * Some cpus support VM_ENTRY_(LOAD|SAVE)_IA32_PERF_GLOBAL_CTRL * but due to arrata below it can't be used. Workaround is to use * msr load mechanism to switch IA32_PERF_GLOBAL_CTRL. * * VM Exit May Incorrectly Clear IA32_PERF_GLOBAL_CTRL [34:32] * * AAK155 (model 26) * AAP115 (model 30) * AAT100 (model 37) * BC86,AAY89,BD102 (model 44) * BA97 (model 46) * */ if (cpu_has_load_perf_global_ctrl && boot_cpu_data.x86 == 0x6) { switch (boot_cpu_data.x86_model) { case 26: case 30: case 37: case 44: case 46: cpu_has_load_perf_global_ctrl = false; printk_once(KERN_WARNING"kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL " "does not work properly. Using workaround\n"); break; default: break; } } return 0; } static struct vmcs *alloc_vmcs_cpu(int cpu) { int node = cpu_to_node(cpu); struct page *pages; struct vmcs *vmcs; pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order); if (!pages) return NULL; vmcs = page_address(pages); memset(vmcs, 0, vmcs_config.size); vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */ return vmcs; } static struct vmcs *alloc_vmcs(void) { return alloc_vmcs_cpu(raw_smp_processor_id()); } static void free_vmcs(struct vmcs *vmcs) { free_pages((unsigned long)vmcs, vmcs_config.order); } /* * Free a VMCS, but before that VMCLEAR it on the CPU where it was last loaded */ static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs) { if (!loaded_vmcs->vmcs) return; loaded_vmcs_clear(loaded_vmcs); free_vmcs(loaded_vmcs->vmcs); loaded_vmcs->vmcs = NULL; } static void free_kvm_area(void) { int cpu; for_each_possible_cpu(cpu) { free_vmcs(per_cpu(vmxarea, cpu)); per_cpu(vmxarea, cpu) = NULL; } } static __init int alloc_kvm_area(void) { int cpu; for_each_possible_cpu(cpu) { struct vmcs *vmcs; vmcs = alloc_vmcs_cpu(cpu); if (!vmcs) { free_kvm_area(); return -ENOMEM; } per_cpu(vmxarea, cpu) = vmcs; } return 0; } static __init int hardware_setup(void) { if (setup_vmcs_config(&vmcs_config) < 0) return -EIO; if (boot_cpu_has(X86_FEATURE_NX)) kvm_enable_efer_bits(EFER_NX); if (!cpu_has_vmx_vpid()) enable_vpid = 0; if (!cpu_has_vmx_ept() || !cpu_has_vmx_ept_4levels()) { enable_ept = 0; enable_unrestricted_guest = 0; } if (!cpu_has_vmx_unrestricted_guest()) enable_unrestricted_guest = 0; if (!cpu_has_vmx_flexpriority()) flexpriority_enabled = 0; if (!cpu_has_vmx_tpr_shadow()) kvm_x86_ops->update_cr8_intercept = NULL; if (enable_ept && !cpu_has_vmx_ept_2m_page()) kvm_disable_largepages(); if (!cpu_has_vmx_ple()) ple_gap = 0; if (nested) nested_vmx_setup_ctls_msrs(); return alloc_kvm_area(); } static __exit void hardware_unsetup(void) { free_kvm_area(); } static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save) { struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) { vmcs_write16(sf->selector, save->selector); vmcs_writel(sf->base, save->base); vmcs_write32(sf->limit, save->limit); vmcs_write32(sf->ar_bytes, save->ar); } else { u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK) << AR_DPL_SHIFT; vmcs_write32(sf->ar_bytes, 0x93 | dpl); } } static void enter_pmode(struct kvm_vcpu *vcpu) { unsigned long flags; struct vcpu_vmx *vmx = to_vmx(vcpu); vmx->emulation_required = 1; vmx->rmode.vm86_active = 0; vmx_segment_cache_clear(vmx); vmcs_write16(GUEST_TR_SELECTOR, vmx->rmode.tr.selector); vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base); vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit); vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar); flags = vmcs_readl(GUEST_RFLAGS); flags &= RMODE_GUEST_OWNED_EFLAGS_BITS; flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS; vmcs_writel(GUEST_RFLAGS, flags); vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) | (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME)); update_exception_bitmap(vcpu); if (emulate_invalid_guest_state) return; fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es); fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds); fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs); fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs); vmx_segment_cache_clear(vmx); vmcs_write16(GUEST_SS_SELECTOR, 0); vmcs_write32(GUEST_SS_AR_BYTES, 0x93); vmcs_write16(GUEST_CS_SELECTOR, vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK); vmcs_write32(GUEST_CS_AR_BYTES, 0x9b); } static gva_t rmode_tss_base(struct kvm *kvm) { if (!kvm->arch.tss_addr) { struct kvm_memslots *slots; struct kvm_memory_slot *slot; gfn_t base_gfn; slots = kvm_memslots(kvm); slot = id_to_memslot(slots, 0); base_gfn = slot->base_gfn + slot->npages - 3; return base_gfn << PAGE_SHIFT; } return kvm->arch.tss_addr; } static void fix_rmode_seg(int seg, struct kvm_save_segment *save) { struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; save->selector = vmcs_read16(sf->selector); save->base = vmcs_readl(sf->base); save->limit = vmcs_read32(sf->limit); save->ar = vmcs_read32(sf->ar_bytes); vmcs_write16(sf->selector, save->base >> 4); vmcs_write32(sf->base, save->base & 0xffff0); vmcs_write32(sf->limit, 0xffff); vmcs_write32(sf->ar_bytes, 0xf3); if (save->base & 0xf) printk_once(KERN_WARNING "kvm: segment base is not paragraph" " aligned when entering protected mode (seg=%d)", seg); } static void enter_rmode(struct kvm_vcpu *vcpu) { unsigned long flags; struct vcpu_vmx *vmx = to_vmx(vcpu); if (enable_unrestricted_guest) return; vmx->emulation_required = 1; vmx->rmode.vm86_active = 1; /* * Very old userspace does not call KVM_SET_TSS_ADDR before entering * vcpu. Call it here with phys address pointing 16M below 4G. */ if (!vcpu->kvm->arch.tss_addr) { printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be " "called before entering vcpu\n"); srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); vmx_set_tss_addr(vcpu->kvm, 0xfeffd000); vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); } vmx_segment_cache_clear(vmx); vmx->rmode.tr.selector = vmcs_read16(GUEST_TR_SELECTOR); vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE); vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm)); vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT); vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES); vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); flags = vmcs_readl(GUEST_RFLAGS); vmx->rmode.save_rflags = flags; flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; vmcs_writel(GUEST_RFLAGS, flags); vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME); update_exception_bitmap(vcpu); if (emulate_invalid_guest_state) goto continue_rmode; vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4); vmcs_write32(GUEST_SS_LIMIT, 0xffff); vmcs_write32(GUEST_SS_AR_BYTES, 0xf3); vmcs_write32(GUEST_CS_AR_BYTES, 0xf3); vmcs_write32(GUEST_CS_LIMIT, 0xffff); if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000) vmcs_writel(GUEST_CS_BASE, 0xf0000); vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4); fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es); fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds); fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs); fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs); continue_rmode: kvm_mmu_reset_context(vcpu); } static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER); if (!msr) return; /* * Force kernel_gs_base reloading before EFER changes, as control * of this msr depends on is_long_mode(). */ vmx_load_host_state(to_vmx(vcpu)); vcpu->arch.efer = efer; if (efer & EFER_LMA) { vmcs_write32(VM_ENTRY_CONTROLS, vmcs_read32(VM_ENTRY_CONTROLS) | VM_ENTRY_IA32E_MODE); msr->data = efer; } else { vmcs_write32(VM_ENTRY_CONTROLS, vmcs_read32(VM_ENTRY_CONTROLS) & ~VM_ENTRY_IA32E_MODE); msr->data = efer & ~EFER_LME; } setup_msrs(vmx); } #ifdef CONFIG_X86_64 static void enter_lmode(struct kvm_vcpu *vcpu) { u32 guest_tr_ar; vmx_segment_cache_clear(to_vmx(vcpu)); guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES); if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) { pr_debug_ratelimited("%s: tss fixup for long mode. \n", __func__); vmcs_write32(GUEST_TR_AR_BYTES, (guest_tr_ar & ~AR_TYPE_MASK) | AR_TYPE_BUSY_64_TSS); } vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA); } static void exit_lmode(struct kvm_vcpu *vcpu) { vmcs_write32(VM_ENTRY_CONTROLS, vmcs_read32(VM_ENTRY_CONTROLS) & ~VM_ENTRY_IA32E_MODE); vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA); } #endif static void vmx_flush_tlb(struct kvm_vcpu *vcpu) { vpid_sync_context(to_vmx(vcpu)); if (enable_ept) { if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) return; ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa)); } } static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) { ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits; vcpu->arch.cr0 &= ~cr0_guest_owned_bits; vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits; } static void vmx_decache_cr3(struct kvm_vcpu *vcpu) { if (enable_ept && is_paging(vcpu)) vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); } static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) { ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; vcpu->arch.cr4 &= ~cr4_guest_owned_bits; vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits; } static void ept_load_pdptrs(struct kvm_vcpu *vcpu) { if (!test_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_dirty)) return; if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { vmcs_write64(GUEST_PDPTR0, vcpu->arch.mmu.pdptrs[0]); vmcs_write64(GUEST_PDPTR1, vcpu->arch.mmu.pdptrs[1]); vmcs_write64(GUEST_PDPTR2, vcpu->arch.mmu.pdptrs[2]); vmcs_write64(GUEST_PDPTR3, vcpu->arch.mmu.pdptrs[3]); } } static void ept_save_pdptrs(struct kvm_vcpu *vcpu) { if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { vcpu->arch.mmu.pdptrs[0] = vmcs_read64(GUEST_PDPTR0); vcpu->arch.mmu.pdptrs[1] = vmcs_read64(GUEST_PDPTR1); vcpu->arch.mmu.pdptrs[2] = vmcs_read64(GUEST_PDPTR2); vcpu->arch.mmu.pdptrs[3] = vmcs_read64(GUEST_PDPTR3); } __set_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_avail); __set_bit(VCPU_EXREG_PDPTR, (unsigned long *)&vcpu->arch.regs_dirty); } static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4); static void ept_update_paging_mode_cr0(unsigned long *hw_cr0, unsigned long cr0, struct kvm_vcpu *vcpu) { if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail)) vmx_decache_cr3(vcpu); if (!(cr0 & X86_CR0_PG)) { /* From paging/starting to nonpaging */ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) | (CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING)); vcpu->arch.cr0 = cr0; vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); } else if (!is_paging(vcpu)) { /* From nonpaging to paging */ vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) & ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING)); vcpu->arch.cr0 = cr0; vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); } if (!(cr0 & X86_CR0_WP)) *hw_cr0 &= ~X86_CR0_WP; } static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) { struct vcpu_vmx *vmx = to_vmx(vcpu); unsigned long hw_cr0; if (enable_unrestricted_guest) hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST) | KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST; else hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON; if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE)) enter_pmode(vcpu); if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE)) enter_rmode(vcpu); #ifdef CONFIG_X86_64 if (vcpu->arch.efer & EFER_LME) { if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) enter_lmode(vcpu); if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) exit_lmode(vcpu); } #endif if (enable_ept) ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu); if (!vcpu->fpu_active) hw_cr0 |= X86_CR0_TS | X86_CR0_MP; vmcs_writel(CR0_READ_SHADOW, cr0); vmcs_writel(GUEST_CR0, hw_cr0); vcpu->arch.cr0 = cr0; __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail); } static u64 construct_eptp(unsigned long root_hpa) { u64 eptp; /* TODO write the value reading from MSR */ eptp = VMX_EPT_DEFAULT_MT | VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT; eptp |= (root_hpa & PAGE_MASK); return eptp; } static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) { unsigned long guest_cr3; u64 eptp; guest_cr3 = cr3; if (enable_ept) { eptp = construct_eptp(cr3); vmcs_write64(EPT_POINTER, eptp); guest_cr3 = is_paging(vcpu) ? kvm_read_cr3(vcpu) : vcpu->kvm->arch.ept_identity_map_addr; ept_load_pdptrs(vcpu); } vmx_flush_tlb(vcpu); vmcs_writel(GUEST_CR3, guest_cr3); } static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) { unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ? KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON); if (cr4 & X86_CR4_VMXE) { /* * To use VMXON (and later other VMX instructions), a guest * must first be able to turn on cr4.VMXE (see handle_vmon()). * So basically the check on whether to allow nested VMX * is here. */ if (!nested_vmx_allowed(vcpu)) return 1; } else if (to_vmx(vcpu)->nested.vmxon) return 1; vcpu->arch.cr4 = cr4; if (enable_ept) { if (!is_paging(vcpu)) { hw_cr4 &= ~X86_CR4_PAE; hw_cr4 |= X86_CR4_PSE; } else if (!(cr4 & X86_CR4_PAE)) { hw_cr4 &= ~X86_CR4_PAE; } } vmcs_writel(CR4_READ_SHADOW, cr4); vmcs_writel(GUEST_CR4, hw_cr4); return 0; } static void vmx_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct kvm_save_segment *save; u32 ar; if (vmx->rmode.vm86_active && (seg == VCPU_SREG_TR || seg == VCPU_SREG_ES || seg == VCPU_SREG_DS || seg == VCPU_SREG_FS || seg == VCPU_SREG_GS) && !emulate_invalid_guest_state) { switch (seg) { case VCPU_SREG_TR: save = &vmx->rmode.tr; break; case VCPU_SREG_ES: save = &vmx->rmode.es; break; case VCPU_SREG_DS: save = &vmx->rmode.ds; break; case VCPU_SREG_FS: save = &vmx->rmode.fs; break; case VCPU_SREG_GS: save = &vmx->rmode.gs; break; default: BUG(); } var->selector = save->selector; var->base = save->base; var->limit = save->limit; ar = save->ar; if (seg == VCPU_SREG_TR || var->selector == vmx_read_guest_seg_selector(vmx, seg)) goto use_saved_rmode_seg; } var->base = vmx_read_guest_seg_base(vmx, seg); var->limit = vmx_read_guest_seg_limit(vmx, seg); var->selector = vmx_read_guest_seg_selector(vmx, seg); ar = vmx_read_guest_seg_ar(vmx, seg); use_saved_rmode_seg: if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state) ar = 0; var->type = ar & 15; var->s = (ar >> 4) & 1; var->dpl = (ar >> 5) & 3; var->present = (ar >> 7) & 1; var->avl = (ar >> 12) & 1; var->l = (ar >> 13) & 1; var->db = (ar >> 14) & 1; var->g = (ar >> 15) & 1; var->unusable = (ar >> 16) & 1; } static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg) { struct kvm_segment s; if (to_vmx(vcpu)->rmode.vm86_active) { vmx_get_segment(vcpu, &s, seg); return s.base; } return vmx_read_guest_seg_base(to_vmx(vcpu), seg); } static int __vmx_get_cpl(struct kvm_vcpu *vcpu) { if (!is_protmode(vcpu)) return 0; if (!is_long_mode(vcpu) && (kvm_get_rflags(vcpu) & X86_EFLAGS_VM)) /* if virtual 8086 */ return 3; return vmx_read_guest_seg_selector(to_vmx(vcpu), VCPU_SREG_CS) & 3; } static int vmx_get_cpl(struct kvm_vcpu *vcpu) { if (!test_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail)) { __set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail); to_vmx(vcpu)->cpl = __vmx_get_cpl(vcpu); } return to_vmx(vcpu)->cpl; } static u32 vmx_segment_access_rights(struct kvm_segment *var) { u32 ar; if (var->unusable) ar = 1 << 16; else { ar = var->type & 15; ar |= (var->s & 1) << 4; ar |= (var->dpl & 3) << 5; ar |= (var->present & 1) << 7; ar |= (var->avl & 1) << 12; ar |= (var->l & 1) << 13; ar |= (var->db & 1) << 14; ar |= (var->g & 1) << 15; } if (ar == 0) /* a 0 value means unusable */ ar = AR_UNUSABLE_MASK; return ar; } static void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; u32 ar; vmx_segment_cache_clear(vmx); if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) { vmcs_write16(sf->selector, var->selector); vmx->rmode.tr.selector = var->selector; vmx->rmode.tr.base = var->base; vmx->rmode.tr.limit = var->limit; vmx->rmode.tr.ar = vmx_segment_access_rights(var); return; } vmcs_writel(sf->base, var->base); vmcs_write32(sf->limit, var->limit); vmcs_write16(sf->selector, var->selector); if (vmx->rmode.vm86_active && var->s) { /* * Hack real-mode segments into vm86 compatibility. */ if (var->base == 0xffff0000 && var->selector == 0xf000) vmcs_writel(sf->base, 0xf0000); ar = 0xf3; } else ar = vmx_segment_access_rights(var); /* * Fix the "Accessed" bit in AR field of segment registers for older * qemu binaries. * IA32 arch specifies that at the time of processor reset the * "Accessed" bit in the AR field of segment registers is 1. And qemu * is setting it to 0 in the usedland code. This causes invalid guest * state vmexit when "unrestricted guest" mode is turned on. * Fix for this setup issue in cpu_reset is being pushed in the qemu * tree. Newer qemu binaries with that qemu fix would not need this * kvm hack. */ if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR)) ar |= 0x1; /* Accessed */ vmcs_write32(sf->ar_bytes, ar); __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail); } static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) { u32 ar = vmx_read_guest_seg_ar(to_vmx(vcpu), VCPU_SREG_CS); *db = (ar >> 14) & 1; *l = (ar >> 13) & 1; } static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) { dt->size = vmcs_read32(GUEST_IDTR_LIMIT); dt->address = vmcs_readl(GUEST_IDTR_BASE); } static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) { vmcs_write32(GUEST_IDTR_LIMIT, dt->size); vmcs_writel(GUEST_IDTR_BASE, dt->address); } static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) { dt->size = vmcs_read32(GUEST_GDTR_LIMIT); dt->address = vmcs_readl(GUEST_GDTR_BASE); } static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) { vmcs_write32(GUEST_GDTR_LIMIT, dt->size); vmcs_writel(GUEST_GDTR_BASE, dt->address); } static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) { struct kvm_segment var; u32 ar; vmx_get_segment(vcpu, &var, seg); ar = vmx_segment_access_rights(&var); if (var.base != (var.selector << 4)) return false; if (var.limit != 0xffff) return false; if (ar != 0xf3) return false; return true; } static bool code_segment_valid(struct kvm_vcpu *vcpu) { struct kvm_segment cs; unsigned int cs_rpl; vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); cs_rpl = cs.selector & SELECTOR_RPL_MASK; if (cs.unusable) return false; if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK)) return false; if (!cs.s) return false; if (cs.type & AR_TYPE_WRITEABLE_MASK) { if (cs.dpl > cs_rpl) return false; } else { if (cs.dpl != cs_rpl) return false; } if (!cs.present) return false; /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */ return true; } static bool stack_segment_valid(struct kvm_vcpu *vcpu) { struct kvm_segment ss; unsigned int ss_rpl; vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); ss_rpl = ss.selector & SELECTOR_RPL_MASK; if (ss.unusable) return true; if (ss.type != 3 && ss.type != 7) return false; if (!ss.s) return false; if (ss.dpl != ss_rpl) /* DPL != RPL */ return false; if (!ss.present) return false; return true; } static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg) { struct kvm_segment var; unsigned int rpl; vmx_get_segment(vcpu, &var, seg); rpl = var.selector & SELECTOR_RPL_MASK; if (var.unusable) return true; if (!var.s) return false; if (!var.present) return false; if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) { if (var.dpl < rpl) /* DPL < RPL */ return false; } /* TODO: Add other members to kvm_segment_field to allow checking for other access * rights flags */ return true; } static bool tr_valid(struct kvm_vcpu *vcpu) { struct kvm_segment tr; vmx_get_segment(vcpu, &tr, VCPU_SREG_TR); if (tr.unusable) return false; if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */ return false; if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */ return false; if (!tr.present) return false; return true; } static bool ldtr_valid(struct kvm_vcpu *vcpu) { struct kvm_segment ldtr; vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR); if (ldtr.unusable) return true; if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */ return false; if (ldtr.type != 2) return false; if (!ldtr.present) return false; return true; } static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu) { struct kvm_segment cs, ss; vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); return ((cs.selector & SELECTOR_RPL_MASK) == (ss.selector & SELECTOR_RPL_MASK)); } /* * Check if guest state is valid. Returns true if valid, false if * not. * We assume that registers are always usable */ static bool guest_state_valid(struct kvm_vcpu *vcpu) { /* real mode guest state checks */ if (!is_protmode(vcpu)) { if (!rmode_segment_valid(vcpu, VCPU_SREG_CS)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_SS)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_DS)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_ES)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_FS)) return false; if (!rmode_segment_valid(vcpu, VCPU_SREG_GS)) return false; } else { /* protected mode guest state checks */ if (!cs_ss_rpl_check(vcpu)) return false; if (!code_segment_valid(vcpu)) return false; if (!stack_segment_valid(vcpu)) return false; if (!data_segment_valid(vcpu, VCPU_SREG_DS)) return false; if (!data_segment_valid(vcpu, VCPU_SREG_ES)) return false; if (!data_segment_valid(vcpu, VCPU_SREG_FS)) return false; if (!data_segment_valid(vcpu, VCPU_SREG_GS)) return false; if (!tr_valid(vcpu)) return false; if (!ldtr_valid(vcpu)) return false; } /* TODO: * - Add checks on RIP * - Add checks on RFLAGS */ return true; } static int init_rmode_tss(struct kvm *kvm) { gfn_t fn; u16 data = 0; int r, idx, ret = 0; idx = srcu_read_lock(&kvm->srcu); fn = rmode_tss_base(kvm) >> PAGE_SHIFT; r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); if (r < 0) goto out; data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE; r = kvm_write_guest_page(kvm, fn++, &data, TSS_IOPB_BASE_OFFSET, sizeof(u16)); if (r < 0) goto out; r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE); if (r < 0) goto out; r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); if (r < 0) goto out; data = ~0; r = kvm_write_guest_page(kvm, fn, &data, RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1, sizeof(u8)); if (r < 0) goto out; ret = 1; out: srcu_read_unlock(&kvm->srcu, idx); return ret; } static int init_rmode_identity_map(struct kvm *kvm) { int i, idx, r, ret; pfn_t identity_map_pfn; u32 tmp; if (!enable_ept) return 1; if (unlikely(!kvm->arch.ept_identity_pagetable)) { printk(KERN_ERR "EPT: identity-mapping pagetable " "haven't been allocated!\n"); return 0; } if (likely(kvm->arch.ept_identity_pagetable_done)) return 1; ret = 0; identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT; idx = srcu_read_lock(&kvm->srcu); r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); if (r < 0) goto out; /* Set up identity-mapping pagetable for EPT in real mode */ for (i = 0; i < PT32_ENT_PER_PAGE; i++) { tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE); r = kvm_write_guest_page(kvm, identity_map_pfn, &tmp, i * sizeof(tmp), sizeof(tmp)); if (r < 0) goto out; } kvm->arch.ept_identity_pagetable_done = true; ret = 1; out: srcu_read_unlock(&kvm->srcu, idx); return ret; } static void seg_setup(int seg) { struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; unsigned int ar; vmcs_write16(sf->selector, 0); vmcs_writel(sf->base, 0); vmcs_write32(sf->limit, 0xffff); if (enable_unrestricted_guest) { ar = 0x93; if (seg == VCPU_SREG_CS) ar |= 0x08; /* code segment */ } else ar = 0xf3; vmcs_write32(sf->ar_bytes, ar); } static int alloc_apic_access_page(struct kvm *kvm) { struct kvm_userspace_memory_region kvm_userspace_mem; int r = 0; mutex_lock(&kvm->slots_lock); if (kvm->arch.apic_access_page) goto out; kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT; kvm_userspace_mem.flags = 0; kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL; kvm_userspace_mem.memory_size = PAGE_SIZE; r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0); if (r) goto out; kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00); out: mutex_unlock(&kvm->slots_lock); return r; } static int alloc_identity_pagetable(struct kvm *kvm) { struct kvm_userspace_memory_region kvm_userspace_mem; int r = 0; mutex_lock(&kvm->slots_lock); if (kvm->arch.ept_identity_pagetable) goto out; kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT; kvm_userspace_mem.flags = 0; kvm_userspace_mem.guest_phys_addr = kvm->arch.ept_identity_map_addr; kvm_userspace_mem.memory_size = PAGE_SIZE; r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0); if (r) goto out; kvm->arch.ept_identity_pagetable = gfn_to_page(kvm, kvm->arch.ept_identity_map_addr >> PAGE_SHIFT); out: mutex_unlock(&kvm->slots_lock); return r; } static void allocate_vpid(struct vcpu_vmx *vmx) { int vpid; vmx->vpid = 0; if (!enable_vpid) return; spin_lock(&vmx_vpid_lock); vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS); if (vpid < VMX_NR_VPIDS) { vmx->vpid = vpid; __set_bit(vpid, vmx_vpid_bitmap); } spin_unlock(&vmx_vpid_lock); } static void free_vpid(struct vcpu_vmx *vmx) { if (!enable_vpid) return; spin_lock(&vmx_vpid_lock); if (vmx->vpid != 0) __clear_bit(vmx->vpid, vmx_vpid_bitmap); spin_unlock(&vmx_vpid_lock); } static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr) { int f = sizeof(unsigned long); if (!cpu_has_vmx_msr_bitmap()) return; /* * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals * have the write-low and read-high bitmap offsets the wrong way round. * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. */ if (msr <= 0x1fff) { __clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */ __clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */ } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { msr &= 0x1fff; __clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */ __clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */ } } static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only) { if (!longmode_only) __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr); __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr); } /* * Set up the vmcs's constant host-state fields, i.e., host-state fields that * will not change in the lifetime of the guest. * Note that host-state that does change is set elsewhere. E.g., host-state * that is set differently for each CPU is set in vmx_vcpu_load(), not here. */ static void vmx_set_constant_host_state(void) { u32 low32, high32; unsigned long tmpl; struct desc_ptr dt; vmcs_writel(HOST_CR0, read_cr0() | X86_CR0_TS); /* 22.2.3 */ vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */ vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */ vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */ vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */ vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */ native_store_idt(&dt); vmcs_writel(HOST_IDTR_BASE, dt.address); /* 22.2.4 */ asm("mov $.Lkvm_vmx_return, %0" : "=r"(tmpl)); vmcs_writel(HOST_RIP, tmpl); /* 22.2.5 */ rdmsr(MSR_IA32_SYSENTER_CS, low32, high32); vmcs_write32(HOST_IA32_SYSENTER_CS, low32); rdmsrl(MSR_IA32_SYSENTER_EIP, tmpl); vmcs_writel(HOST_IA32_SYSENTER_EIP, tmpl); /* 22.2.3 */ if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) { rdmsr(MSR_IA32_CR_PAT, low32, high32); vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32)); } } static void set_cr4_guest_host_mask(struct vcpu_vmx *vmx) { vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS; if (enable_ept) vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE; if (is_guest_mode(&vmx->vcpu)) vmx->vcpu.arch.cr4_guest_owned_bits &= ~get_vmcs12(&vmx->vcpu)->cr4_guest_host_mask; vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits); } static u32 vmx_exec_control(struct vcpu_vmx *vmx) { u32 exec_control = vmcs_config.cpu_based_exec_ctrl; if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) { exec_control &= ~CPU_BASED_TPR_SHADOW; #ifdef CONFIG_X86_64 exec_control |= CPU_BASED_CR8_STORE_EXITING | CPU_BASED_CR8_LOAD_EXITING; #endif } if (!enable_ept) exec_control |= CPU_BASED_CR3_STORE_EXITING | CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_INVLPG_EXITING; return exec_control; } static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx) { u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl; if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; if (vmx->vpid == 0) exec_control &= ~SECONDARY_EXEC_ENABLE_VPID; if (!enable_ept) { exec_control &= ~SECONDARY_EXEC_ENABLE_EPT; enable_unrestricted_guest = 0; } if (!enable_unrestricted_guest) exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST; if (!ple_gap) exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING; return exec_control; } static void ept_set_mmio_spte_mask(void) { /* * EPT Misconfigurations can be generated if the value of bits 2:0 * of an EPT paging-structure entry is 110b (write/execute). * Also, magic bits (0xffull << 49) is set to quickly identify mmio * spte. */ kvm_mmu_set_mmio_spte_mask(0xffull << 49 | 0x6ull); } /* * Sets up the vmcs for emulated real mode. */ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) { #ifdef CONFIG_X86_64 unsigned long a; #endif int i; /* I/O */ vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a)); vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b)); if (cpu_has_vmx_msr_bitmap()) vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy)); vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */ /* Control */ vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmcs_config.pin_based_exec_ctrl); vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmx_exec_control(vmx)); if (cpu_has_secondary_exec_ctrls()) { vmcs_write32(SECONDARY_VM_EXEC_CONTROL, vmx_secondary_exec_control(vmx)); } if (ple_gap) { vmcs_write32(PLE_GAP, ple_gap); vmcs_write32(PLE_WINDOW, ple_window); } vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0); vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0); vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */ vmcs_write16(HOST_FS_SELECTOR, 0); /* 22.2.4 */ vmcs_write16(HOST_GS_SELECTOR, 0); /* 22.2.4 */ vmx_set_constant_host_state(); #ifdef CONFIG_X86_64 rdmsrl(MSR_FS_BASE, a); vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */ rdmsrl(MSR_GS_BASE, a); vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */ #else vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */ vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */ #endif vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0); vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0); vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host)); vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0); vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest)); if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { u32 msr_low, msr_high; u64 host_pat; rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high); host_pat = msr_low | ((u64) msr_high << 32); /* Write the default value follow host pat */ vmcs_write64(GUEST_IA32_PAT, host_pat); /* Keep arch.pat sync with GUEST_IA32_PAT */ vmx->vcpu.arch.pat = host_pat; } for (i = 0; i < NR_VMX_MSR; ++i) { u32 index = vmx_msr_index[i]; u32 data_low, data_high; int j = vmx->nmsrs; if (rdmsr_safe(index, &data_low, &data_high) < 0) continue; if (wrmsr_safe(index, data_low, data_high) < 0) continue; vmx->guest_msrs[j].index = i; vmx->guest_msrs[j].data = 0; vmx->guest_msrs[j].mask = -1ull; ++vmx->nmsrs; } vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl); /* 22.2.1, 20.8.1 */ vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl); vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL); set_cr4_guest_host_mask(vmx); kvm_write_tsc(&vmx->vcpu, 0); return 0; } static int vmx_vcpu_reset(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); u64 msr; int ret; vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)); vmx->rmode.vm86_active = 0; vmx->soft_vnmi_blocked = 0; vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val(); kvm_set_cr8(&vmx->vcpu, 0); msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE; if (kvm_vcpu_is_bsp(&vmx->vcpu)) msr |= MSR_IA32_APICBASE_BSP; kvm_set_apic_base(&vmx->vcpu, msr); ret = fx_init(&vmx->vcpu); if (ret != 0) goto out; vmx_segment_cache_clear(vmx); seg_setup(VCPU_SREG_CS); /* * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh. */ if (kvm_vcpu_is_bsp(&vmx->vcpu)) { vmcs_write16(GUEST_CS_SELECTOR, 0xf000); vmcs_writel(GUEST_CS_BASE, 0x000f0000); } else { vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8); vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12); } seg_setup(VCPU_SREG_DS); seg_setup(VCPU_SREG_ES); seg_setup(VCPU_SREG_FS); seg_setup(VCPU_SREG_GS); seg_setup(VCPU_SREG_SS); vmcs_write16(GUEST_TR_SELECTOR, 0); vmcs_writel(GUEST_TR_BASE, 0); vmcs_write32(GUEST_TR_LIMIT, 0xffff); vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); vmcs_write16(GUEST_LDTR_SELECTOR, 0); vmcs_writel(GUEST_LDTR_BASE, 0); vmcs_write32(GUEST_LDTR_LIMIT, 0xffff); vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082); vmcs_write32(GUEST_SYSENTER_CS, 0); vmcs_writel(GUEST_SYSENTER_ESP, 0); vmcs_writel(GUEST_SYSENTER_EIP, 0); vmcs_writel(GUEST_RFLAGS, 0x02); if (kvm_vcpu_is_bsp(&vmx->vcpu)) kvm_rip_write(vcpu, 0xfff0); else kvm_rip_write(vcpu, 0); kvm_register_write(vcpu, VCPU_REGS_RSP, 0); vmcs_writel(GUEST_DR7, 0x400); vmcs_writel(GUEST_GDTR_BASE, 0); vmcs_write32(GUEST_GDTR_LIMIT, 0xffff); vmcs_writel(GUEST_IDTR_BASE, 0); vmcs_write32(GUEST_IDTR_LIMIT, 0xffff); vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE); vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0); vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0); /* Special registers */ vmcs_write64(GUEST_IA32_DEBUGCTL, 0); setup_msrs(vmx); vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */ if (cpu_has_vmx_tpr_shadow()) { vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0); if (vm_need_tpr_shadow(vmx->vcpu.kvm)) vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, __pa(vmx->vcpu.arch.apic->regs)); vmcs_write32(TPR_THRESHOLD, 0); } if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) vmcs_write64(APIC_ACCESS_ADDR, page_to_phys(vmx->vcpu.kvm->arch.apic_access_page)); if (vmx->vpid != 0) vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET; vmx_set_cr0(&vmx->vcpu, kvm_read_cr0(vcpu)); /* enter rmode */ vmx_set_cr4(&vmx->vcpu, 0); vmx_set_efer(&vmx->vcpu, 0); vmx_fpu_activate(&vmx->vcpu); update_exception_bitmap(&vmx->vcpu); vpid_sync_context(vmx); ret = 0; /* HACK: Don't enable emulation on guest boot/reset */ vmx->emulation_required = 0; out: return ret; } /* * In nested virtualization, check if L1 asked to exit on external interrupts. * For most existing hypervisors, this will always return true. */ static bool nested_exit_on_intr(struct kvm_vcpu *vcpu) { return get_vmcs12(vcpu)->pin_based_vm_exec_control & PIN_BASED_EXT_INTR_MASK; } static void enable_irq_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) { /* * We get here if vmx_interrupt_allowed() said we can't * inject to L1 now because L2 must run. Ask L2 to exit * right after entry, so we can inject to L1 more promptly. */ kvm_make_request(KVM_REQ_IMMEDIATE_EXIT, vcpu); return; } cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); } static void enable_nmi_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; if (!cpu_has_virtual_nmis()) { enable_irq_window(vcpu); return; } if (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) { enable_irq_window(vcpu); return; } cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); } static void vmx_inject_irq(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); uint32_t intr; int irq = vcpu->arch.interrupt.nr; trace_kvm_inj_virq(irq); ++vcpu->stat.irq_injections; if (vmx->rmode.vm86_active) { int inc_eip = 0; if (vcpu->arch.interrupt.soft) inc_eip = vcpu->arch.event_exit_inst_len; if (kvm_inject_realmode_interrupt(vcpu, irq, inc_eip) != EMULATE_DONE) kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); return; } intr = irq | INTR_INFO_VALID_MASK; if (vcpu->arch.interrupt.soft) { intr |= INTR_TYPE_SOFT_INTR; vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, vmx->vcpu.arch.event_exit_inst_len); } else intr |= INTR_TYPE_EXT_INTR; vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr); vmx_clear_hlt(vcpu); } static void vmx_inject_nmi(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); if (is_guest_mode(vcpu)) return; if (!cpu_has_virtual_nmis()) { /* * Tracking the NMI-blocked state in software is built upon * finding the next open IRQ window. This, in turn, depends on * well-behaving guests: They have to keep IRQs disabled at * least as long as the NMI handler runs. Otherwise we may * cause NMI nesting, maybe breaking the guest. But as this is * highly unlikely, we can live with the residual risk. */ vmx->soft_vnmi_blocked = 1; vmx->vnmi_blocked_time = 0; } ++vcpu->stat.nmi_injections; vmx->nmi_known_unmasked = false; if (vmx->rmode.vm86_active) { if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE) kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); return; } vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR); vmx_clear_hlt(vcpu); } static int vmx_nmi_allowed(struct kvm_vcpu *vcpu) { if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked) return 0; return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI | GUEST_INTR_STATE_NMI)); } static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu) { if (!cpu_has_virtual_nmis()) return to_vmx(vcpu)->soft_vnmi_blocked; if (to_vmx(vcpu)->nmi_known_unmasked) return false; return vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI; } static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked) { struct vcpu_vmx *vmx = to_vmx(vcpu); if (!cpu_has_virtual_nmis()) { if (vmx->soft_vnmi_blocked != masked) { vmx->soft_vnmi_blocked = masked; vmx->vnmi_blocked_time = 0; } } else { vmx->nmi_known_unmasked = !masked; if (masked) vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); else vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); } } static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu) { if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) { struct vmcs12 *vmcs12 = get_vmcs12(vcpu); if (to_vmx(vcpu)->nested.nested_run_pending || (vmcs12->idt_vectoring_info_field & VECTORING_INFO_VALID_MASK)) return 0; nested_vmx_vmexit(vcpu); vmcs12->vm_exit_reason = EXIT_REASON_EXTERNAL_INTERRUPT; vmcs12->vm_exit_intr_info = 0; /* fall through to normal code, but now in L1, not L2 */ } return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) && !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS)); } static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr) { int ret; struct kvm_userspace_memory_region tss_mem = { .slot = TSS_PRIVATE_MEMSLOT, .guest_phys_addr = addr, .memory_size = PAGE_SIZE * 3, .flags = 0, }; ret = kvm_set_memory_region(kvm, &tss_mem, 0); if (ret) return ret; kvm->arch.tss_addr = addr; if (!init_rmode_tss(kvm)) return -ENOMEM; return 0; } static int handle_rmode_exception(struct kvm_vcpu *vcpu, int vec, u32 err_code) { /* * Instruction with address size override prefix opcode 0x67 * Cause the #SS fault with 0 error code in VM86 mode. */ if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0) if (emulate_instruction(vcpu, 0) == EMULATE_DONE) return 1; /* * Forward all other exceptions that are valid in real mode. * FIXME: Breaks guest debugging in real mode, needs to be fixed with * the required debugging infrastructure rework. */ switch (vec) { case DB_VECTOR: if (vcpu->guest_debug & (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) return 0; kvm_queue_exception(vcpu, vec); return 1; case BP_VECTOR: /* * Update instruction length as we may reinject the exception * from user space while in guest debugging mode. */ to_vmx(vcpu)->vcpu.arch.event_exit_inst_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) return 0; /* fall through */ case DE_VECTOR: case OF_VECTOR: case BR_VECTOR: case UD_VECTOR: case DF_VECTOR: case SS_VECTOR: case GP_VECTOR: case MF_VECTOR: kvm_queue_exception(vcpu, vec); return 1; } return 0; } /* * Trigger machine check on the host. We assume all the MSRs are already set up * by the CPU and that we still run on the same CPU as the MCE occurred on. * We pass a fake environment to the machine check handler because we want * the guest to be always treated like user space, no matter what context * it used internally. */ static void kvm_machine_check(void) { #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64) struct pt_regs regs = { .cs = 3, /* Fake ring 3 no matter what the guest ran on */ .flags = X86_EFLAGS_IF, }; do_machine_check(®s, 0); #endif } static int handle_machine_check(struct kvm_vcpu *vcpu) { /* already handled by vcpu_run */ return 1; } static int handle_exception(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct kvm_run *kvm_run = vcpu->run; u32 intr_info, ex_no, error_code; unsigned long cr2, rip, dr6; u32 vect_info; enum emulation_result er; vect_info = vmx->idt_vectoring_info; intr_info = vmx->exit_intr_info; if (is_machine_check(intr_info)) return handle_machine_check(vcpu); if ((vect_info & VECTORING_INFO_VALID_MASK) && !is_page_fault(intr_info)) { vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX; vcpu->run->internal.ndata = 2; vcpu->run->internal.data[0] = vect_info; vcpu->run->internal.data[1] = intr_info; return 0; } if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR) return 1; /* already handled by vmx_vcpu_run() */ if (is_no_device(intr_info)) { vmx_fpu_activate(vcpu); return 1; } if (is_invalid_opcode(intr_info)) { er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD); if (er != EMULATE_DONE) kvm_queue_exception(vcpu, UD_VECTOR); return 1; } error_code = 0; if (intr_info & INTR_INFO_DELIVER_CODE_MASK) error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE); if (is_page_fault(intr_info)) { /* EPT won't cause page fault directly */ BUG_ON(enable_ept); cr2 = vmcs_readl(EXIT_QUALIFICATION); trace_kvm_page_fault(cr2, error_code); if (kvm_event_needs_reinjection(vcpu)) kvm_mmu_unprotect_page_virt(vcpu, cr2); return kvm_mmu_page_fault(vcpu, cr2, error_code, NULL, 0); } if (vmx->rmode.vm86_active && handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK, error_code)) { if (vcpu->arch.halt_request) { vcpu->arch.halt_request = 0; return kvm_emulate_halt(vcpu); } return 1; } ex_no = intr_info & INTR_INFO_VECTOR_MASK; switch (ex_no) { case DB_VECTOR: dr6 = vmcs_readl(EXIT_QUALIFICATION); if (!(vcpu->guest_debug & (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) { vcpu->arch.dr6 = dr6 | DR6_FIXED_1; kvm_queue_exception(vcpu, DB_VECTOR); return 1; } kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1; kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7); /* fall through */ case BP_VECTOR: /* * Update instruction length as we may reinject #BP from * user space while in guest debugging mode. Reading it for * #DB as well causes no harm, it is not used in that case. */ vmx->vcpu.arch.event_exit_inst_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); kvm_run->exit_reason = KVM_EXIT_DEBUG; rip = kvm_rip_read(vcpu); kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip; kvm_run->debug.arch.exception = ex_no; break; default: kvm_run->exit_reason = KVM_EXIT_EXCEPTION; kvm_run->ex.exception = ex_no; kvm_run->ex.error_code = error_code; break; } return 0; } static int handle_external_interrupt(struct kvm_vcpu *vcpu) { ++vcpu->stat.irq_exits; return 1; } static int handle_triple_fault(struct kvm_vcpu *vcpu) { vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; return 0; } static int handle_io(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; int size, in, string; unsigned port; exit_qualification = vmcs_readl(EXIT_QUALIFICATION); string = (exit_qualification & 16) != 0; in = (exit_qualification & 8) != 0; ++vcpu->stat.io_exits; if (string || in) return emulate_instruction(vcpu, 0) == EMULATE_DONE; port = exit_qualification >> 16; size = (exit_qualification & 7) + 1; skip_emulated_instruction(vcpu); return kvm_fast_pio_out(vcpu, size, port); } static void vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall) { /* * Patch in the VMCALL instruction: */ hypercall[0] = 0x0f; hypercall[1] = 0x01; hypercall[2] = 0xc1; } /* called to set cr0 as approriate for a mov-to-cr0 exit. */ static int handle_set_cr0(struct kvm_vcpu *vcpu, unsigned long val) { if (to_vmx(vcpu)->nested.vmxon && ((val & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON)) return 1; if (is_guest_mode(vcpu)) { /* * We get here when L2 changed cr0 in a way that did not change * any of L1's shadowed bits (see nested_vmx_exit_handled_cr), * but did change L0 shadowed bits. This can currently happen * with the TS bit: L0 may want to leave TS on (for lazy fpu * loading) while pretending to allow the guest to change it. */ if (kvm_set_cr0(vcpu, (val & vcpu->arch.cr0_guest_owned_bits) | (vcpu->arch.cr0 & ~vcpu->arch.cr0_guest_owned_bits))) return 1; vmcs_writel(CR0_READ_SHADOW, val); return 0; } else return kvm_set_cr0(vcpu, val); } static int handle_set_cr4(struct kvm_vcpu *vcpu, unsigned long val) { if (is_guest_mode(vcpu)) { if (kvm_set_cr4(vcpu, (val & vcpu->arch.cr4_guest_owned_bits) | (vcpu->arch.cr4 & ~vcpu->arch.cr4_guest_owned_bits))) return 1; vmcs_writel(CR4_READ_SHADOW, val); return 0; } else return kvm_set_cr4(vcpu, val); } /* called to set cr0 as approriate for clts instruction exit. */ static void handle_clts(struct kvm_vcpu *vcpu) { if (is_guest_mode(vcpu)) { /* * We get here when L2 did CLTS, and L1 didn't shadow CR0.TS * but we did (!fpu_active). We need to keep GUEST_CR0.TS on, * just pretend it's off (also in arch.cr0 for fpu_activate). */ vmcs_writel(CR0_READ_SHADOW, vmcs_readl(CR0_READ_SHADOW) & ~X86_CR0_TS); vcpu->arch.cr0 &= ~X86_CR0_TS; } else vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS)); } static int handle_cr(struct kvm_vcpu *vcpu) { unsigned long exit_qualification, val; int cr; int reg; int err; exit_qualification = vmcs_readl(EXIT_QUALIFICATION); cr = exit_qualification & 15; reg = (exit_qualification >> 8) & 15; switch ((exit_qualification >> 4) & 3) { case 0: /* mov to cr */ val = kvm_register_read(vcpu, reg); trace_kvm_cr_write(cr, val); switch (cr) { case 0: err = handle_set_cr0(vcpu, val); kvm_complete_insn_gp(vcpu, err); return 1; case 3: err = kvm_set_cr3(vcpu, val); kvm_complete_insn_gp(vcpu, err); return 1; case 4: err = handle_set_cr4(vcpu, val); kvm_complete_insn_gp(vcpu, err); return 1; case 8: { u8 cr8_prev = kvm_get_cr8(vcpu); u8 cr8 = kvm_register_read(vcpu, reg); err = kvm_set_cr8(vcpu, cr8); kvm_complete_insn_gp(vcpu, err); if (irqchip_in_kernel(vcpu->kvm)) return 1; if (cr8_prev <= cr8) return 1; vcpu->run->exit_reason = KVM_EXIT_SET_TPR; return 0; } }; break; case 2: /* clts */ handle_clts(vcpu); trace_kvm_cr_write(0, kvm_read_cr0(vcpu)); skip_emulated_instruction(vcpu); vmx_fpu_activate(vcpu); return 1; case 1: /*mov from cr*/ switch (cr) { case 3: val = kvm_read_cr3(vcpu); kvm_register_write(vcpu, reg, val); trace_kvm_cr_read(cr, val); skip_emulated_instruction(vcpu); return 1; case 8: val = kvm_get_cr8(vcpu); kvm_register_write(vcpu, reg, val); trace_kvm_cr_read(cr, val); skip_emulated_instruction(vcpu); return 1; } break; case 3: /* lmsw */ val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f; trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val); kvm_lmsw(vcpu, val); skip_emulated_instruction(vcpu); return 1; default: break; } vcpu->run->exit_reason = 0; pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n", (int)(exit_qualification >> 4) & 3, cr); return 0; } static int handle_dr(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; int dr, reg; /* Do not handle if the CPL > 0, will trigger GP on re-entry */ if (!kvm_require_cpl(vcpu, 0)) return 1; dr = vmcs_readl(GUEST_DR7); if (dr & DR7_GD) { /* * As the vm-exit takes precedence over the debug trap, we * need to emulate the latter, either for the host or the * guest debugging itself. */ if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { vcpu->run->debug.arch.dr6 = vcpu->arch.dr6; vcpu->run->debug.arch.dr7 = dr; vcpu->run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + vmcs_readl(GUEST_RIP); vcpu->run->debug.arch.exception = DB_VECTOR; vcpu->run->exit_reason = KVM_EXIT_DEBUG; return 0; } else { vcpu->arch.dr7 &= ~DR7_GD; vcpu->arch.dr6 |= DR6_BD; vmcs_writel(GUEST_DR7, vcpu->arch.dr7); kvm_queue_exception(vcpu, DB_VECTOR); return 1; } } exit_qualification = vmcs_readl(EXIT_QUALIFICATION); dr = exit_qualification & DEBUG_REG_ACCESS_NUM; reg = DEBUG_REG_ACCESS_REG(exit_qualification); if (exit_qualification & TYPE_MOV_FROM_DR) { unsigned long val; if (!kvm_get_dr(vcpu, dr, &val)) kvm_register_write(vcpu, reg, val); } else kvm_set_dr(vcpu, dr, vcpu->arch.regs[reg]); skip_emulated_instruction(vcpu); return 1; } static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val) { vmcs_writel(GUEST_DR7, val); } static int handle_cpuid(struct kvm_vcpu *vcpu) { kvm_emulate_cpuid(vcpu); return 1; } static int handle_rdmsr(struct kvm_vcpu *vcpu) { u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; u64 data; if (vmx_get_msr(vcpu, ecx, &data)) { trace_kvm_msr_read_ex(ecx); kvm_inject_gp(vcpu, 0); return 1; } trace_kvm_msr_read(ecx, data); /* FIXME: handling of bits 32:63 of rax, rdx */ vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u; vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u; skip_emulated_instruction(vcpu); return 1; } static int handle_wrmsr(struct kvm_vcpu *vcpu) { u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u) | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32); if (vmx_set_msr(vcpu, ecx, data) != 0) { trace_kvm_msr_write_ex(ecx, data); kvm_inject_gp(vcpu, 0); return 1; } trace_kvm_msr_write(ecx, data); skip_emulated_instruction(vcpu); return 1; } static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu) { kvm_make_request(KVM_REQ_EVENT, vcpu); return 1; } static int handle_interrupt_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; /* clear pending irq */ cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); kvm_make_request(KVM_REQ_EVENT, vcpu); ++vcpu->stat.irq_window_exits; /* * If the user space waits to inject interrupts, exit as soon as * possible */ if (!irqchip_in_kernel(vcpu->kvm) && vcpu->run->request_interrupt_window && !kvm_cpu_has_interrupt(vcpu)) { vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; return 0; } return 1; } static int handle_halt(struct kvm_vcpu *vcpu) { skip_emulated_instruction(vcpu); return kvm_emulate_halt(vcpu); } static int handle_vmcall(struct kvm_vcpu *vcpu) { skip_emulated_instruction(vcpu); kvm_emulate_hypercall(vcpu); return 1; } static int handle_invd(struct kvm_vcpu *vcpu) { return emulate_instruction(vcpu, 0) == EMULATE_DONE; } static int handle_invlpg(struct kvm_vcpu *vcpu) { unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); kvm_mmu_invlpg(vcpu, exit_qualification); skip_emulated_instruction(vcpu); return 1; } static int handle_rdpmc(struct kvm_vcpu *vcpu) { int err; err = kvm_rdpmc(vcpu); kvm_complete_insn_gp(vcpu, err); return 1; } static int handle_wbinvd(struct kvm_vcpu *vcpu) { skip_emulated_instruction(vcpu); kvm_emulate_wbinvd(vcpu); return 1; } static int handle_xsetbv(struct kvm_vcpu *vcpu) { u64 new_bv = kvm_read_edx_eax(vcpu); u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX); if (kvm_set_xcr(vcpu, index, new_bv) == 0) skip_emulated_instruction(vcpu); return 1; } static int handle_apic_access(struct kvm_vcpu *vcpu) { if (likely(fasteoi)) { unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); int access_type, offset; access_type = exit_qualification & APIC_ACCESS_TYPE; offset = exit_qualification & APIC_ACCESS_OFFSET; /* * Sane guest uses MOV to write EOI, with written value * not cared. So make a short-circuit here by avoiding * heavy instruction emulation. */ if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) && (offset == APIC_EOI)) { kvm_lapic_set_eoi(vcpu); skip_emulated_instruction(vcpu); return 1; } } return emulate_instruction(vcpu, 0) == EMULATE_DONE; } static int handle_task_switch(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); unsigned long exit_qualification; bool has_error_code = false; u32 error_code = 0; u16 tss_selector; int reason, type, idt_v; idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK); type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK); exit_qualification = vmcs_readl(EXIT_QUALIFICATION); reason = (u32)exit_qualification >> 30; if (reason == TASK_SWITCH_GATE && idt_v) { switch (type) { case INTR_TYPE_NMI_INTR: vcpu->arch.nmi_injected = false; vmx_set_nmi_mask(vcpu, true); break; case INTR_TYPE_EXT_INTR: case INTR_TYPE_SOFT_INTR: kvm_clear_interrupt_queue(vcpu); break; case INTR_TYPE_HARD_EXCEPTION: if (vmx->idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) { has_error_code = true; error_code = vmcs_read32(IDT_VECTORING_ERROR_CODE); } /* fall through */ case INTR_TYPE_SOFT_EXCEPTION: kvm_clear_exception_queue(vcpu); break; default: break; } } tss_selector = exit_qualification; if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION && type != INTR_TYPE_EXT_INTR && type != INTR_TYPE_NMI_INTR)) skip_emulated_instruction(vcpu); if (kvm_task_switch(vcpu, tss_selector, reason, has_error_code, error_code) == EMULATE_FAIL) { vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; vcpu->run->internal.ndata = 0; return 0; } /* clear all local breakpoint enable flags */ vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55); /* * TODO: What about debug traps on tss switch? * Are we supposed to inject them and update dr6? */ return 1; } static int handle_ept_violation(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; gpa_t gpa; int gla_validity; exit_qualification = vmcs_readl(EXIT_QUALIFICATION); if (exit_qualification & (1 << 6)) { printk(KERN_ERR "EPT: GPA exceeds GAW!\n"); return -EINVAL; } gla_validity = (exit_qualification >> 7) & 0x3; if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) { printk(KERN_ERR "EPT: Handling EPT violation failed!\n"); printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n", (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS), vmcs_readl(GUEST_LINEAR_ADDRESS)); printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n", (long unsigned int)exit_qualification); vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION; return 0; } gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); trace_kvm_page_fault(gpa, exit_qualification); return kvm_mmu_page_fault(vcpu, gpa, exit_qualification & 0x3, NULL, 0); } static u64 ept_rsvd_mask(u64 spte, int level) { int i; u64 mask = 0; for (i = 51; i > boot_cpu_data.x86_phys_bits; i--) mask |= (1ULL << i); if (level > 2) /* bits 7:3 reserved */ mask |= 0xf8; else if (level == 2) { if (spte & (1ULL << 7)) /* 2MB ref, bits 20:12 reserved */ mask |= 0x1ff000; else /* bits 6:3 reserved */ mask |= 0x78; } return mask; } static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte, int level) { printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level); /* 010b (write-only) */ WARN_ON((spte & 0x7) == 0x2); /* 110b (write/execute) */ WARN_ON((spte & 0x7) == 0x6); /* 100b (execute-only) and value not supported by logical processor */ if (!cpu_has_vmx_ept_execute_only()) WARN_ON((spte & 0x7) == 0x4); /* not 000b */ if ((spte & 0x7)) { u64 rsvd_bits = spte & ept_rsvd_mask(spte, level); if (rsvd_bits != 0) { printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n", __func__, rsvd_bits); WARN_ON(1); } if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) { u64 ept_mem_type = (spte & 0x38) >> 3; if (ept_mem_type == 2 || ept_mem_type == 3 || ept_mem_type == 7) { printk(KERN_ERR "%s: ept_mem_type=0x%llx\n", __func__, ept_mem_type); WARN_ON(1); } } } } static int handle_ept_misconfig(struct kvm_vcpu *vcpu) { u64 sptes[4]; int nr_sptes, i, ret; gpa_t gpa; gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); ret = handle_mmio_page_fault_common(vcpu, gpa, true); if (likely(ret == 1)) return x86_emulate_instruction(vcpu, gpa, 0, NULL, 0) == EMULATE_DONE; if (unlikely(!ret)) return 1; /* It is the real ept misconfig */ printk(KERN_ERR "EPT: Misconfiguration.\n"); printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa); nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes); for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i) ept_misconfig_inspect_spte(vcpu, sptes[i-1], i); vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG; return 0; } static int handle_nmi_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; /* clear pending NMI */ cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); ++vcpu->stat.nmi_window_exits; kvm_make_request(KVM_REQ_EVENT, vcpu); return 1; } static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); enum emulation_result err = EMULATE_DONE; int ret = 1; u32 cpu_exec_ctrl; bool intr_window_requested; cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING; while (!guest_state_valid(vcpu)) { if (intr_window_requested && (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF)) return handle_interrupt_window(&vmx->vcpu); err = emulate_instruction(vcpu, 0); if (err == EMULATE_DO_MMIO) { ret = 0; goto out; } if (err != EMULATE_DONE) return 0; if (signal_pending(current)) goto out; if (need_resched()) schedule(); } vmx->emulation_required = 0; out: return ret; } /* * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE * exiting, so only get here on cpu with PAUSE-Loop-Exiting. */ static int handle_pause(struct kvm_vcpu *vcpu) { skip_emulated_instruction(vcpu); kvm_vcpu_on_spin(vcpu); return 1; } static int handle_invalid_op(struct kvm_vcpu *vcpu) { kvm_queue_exception(vcpu, UD_VECTOR); return 1; } /* * To run an L2 guest, we need a vmcs02 based on the L1-specified vmcs12. * We could reuse a single VMCS for all the L2 guests, but we also want the * option to allocate a separate vmcs02 for each separate loaded vmcs12 - this * allows keeping them loaded on the processor, and in the future will allow * optimizations where prepare_vmcs02 doesn't need to set all the fields on * every entry if they never change. * So we keep, in vmx->nested.vmcs02_pool, a cache of size VMCS02_POOL_SIZE * (>=0) with a vmcs02 for each recently loaded vmcs12s, most recent first. * * The following functions allocate and free a vmcs02 in this pool. */ /* Get a VMCS from the pool to use as vmcs02 for the current vmcs12. */ static struct loaded_vmcs *nested_get_current_vmcs02(struct vcpu_vmx *vmx) { struct vmcs02_list *item; list_for_each_entry(item, &vmx->nested.vmcs02_pool, list) if (item->vmptr == vmx->nested.current_vmptr) { list_move(&item->list, &vmx->nested.vmcs02_pool); return &item->vmcs02; } if (vmx->nested.vmcs02_num >= max(VMCS02_POOL_SIZE, 1)) { /* Recycle the least recently used VMCS. */ item = list_entry(vmx->nested.vmcs02_pool.prev, struct vmcs02_list, list); item->vmptr = vmx->nested.current_vmptr; list_move(&item->list, &vmx->nested.vmcs02_pool); return &item->vmcs02; } /* Create a new VMCS */ item = (struct vmcs02_list *) kmalloc(sizeof(struct vmcs02_list), GFP_KERNEL); if (!item) return NULL; item->vmcs02.vmcs = alloc_vmcs(); if (!item->vmcs02.vmcs) { kfree(item); return NULL; } loaded_vmcs_init(&item->vmcs02); item->vmptr = vmx->nested.current_vmptr; list_add(&(item->list), &(vmx->nested.vmcs02_pool)); vmx->nested.vmcs02_num++; return &item->vmcs02; } /* Free and remove from pool a vmcs02 saved for a vmcs12 (if there is one) */ static void nested_free_vmcs02(struct vcpu_vmx *vmx, gpa_t vmptr) { struct vmcs02_list *item; list_for_each_entry(item, &vmx->nested.vmcs02_pool, list) if (item->vmptr == vmptr) { free_loaded_vmcs(&item->vmcs02); list_del(&item->list); kfree(item); vmx->nested.vmcs02_num--; return; } } /* * Free all VMCSs saved for this vcpu, except the one pointed by * vmx->loaded_vmcs. These include the VMCSs in vmcs02_pool (except the one * currently used, if running L2), and vmcs01 when running L2. */ static void nested_free_all_saved_vmcss(struct vcpu_vmx *vmx) { struct vmcs02_list *item, *n; list_for_each_entry_safe(item, n, &vmx->nested.vmcs02_pool, list) { if (vmx->loaded_vmcs != &item->vmcs02) free_loaded_vmcs(&item->vmcs02); list_del(&item->list); kfree(item); } vmx->nested.vmcs02_num = 0; if (vmx->loaded_vmcs != &vmx->vmcs01) free_loaded_vmcs(&vmx->vmcs01); } /* * Emulate the VMXON instruction. * Currently, we just remember that VMX is active, and do not save or even * inspect the argument to VMXON (the so-called "VMXON pointer") because we * do not currently need to store anything in that guest-allocated memory * region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their * argument is different from the VMXON pointer (which the spec says they do). */ static int handle_vmon(struct kvm_vcpu *vcpu) { struct kvm_segment cs; struct vcpu_vmx *vmx = to_vmx(vcpu); /* The Intel VMX Instruction Reference lists a bunch of bits that * are prerequisite to running VMXON, most notably cr4.VMXE must be * set to 1 (see vmx_set_cr4() for when we allow the guest to set this). * Otherwise, we should fail with #UD. We test these now: */ if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE) || !kvm_read_cr0_bits(vcpu, X86_CR0_PE) || (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) { kvm_queue_exception(vcpu, UD_VECTOR); return 1; } vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); if (is_long_mode(vcpu) && !cs.l) { kvm_queue_exception(vcpu, UD_VECTOR); return 1; } if (vmx_get_cpl(vcpu)) { kvm_inject_gp(vcpu, 0); return 1; } INIT_LIST_HEAD(&(vmx->nested.vmcs02_pool)); vmx->nested.vmcs02_num = 0; vmx->nested.vmxon = true; skip_emulated_instruction(vcpu); return 1; } /* * Intel's VMX Instruction Reference specifies a common set of prerequisites * for running VMX instructions (except VMXON, whose prerequisites are * slightly different). It also specifies what exception to inject otherwise. */ static int nested_vmx_check_permission(struct kvm_vcpu *vcpu) { struct kvm_segment cs; struct vcpu_vmx *vmx = to_vmx(vcpu); if (!vmx->nested.vmxon) { kvm_queue_exception(vcpu, UD_VECTOR); return 0; } vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); if ((vmx_get_rflags(vcpu) & X86_EFLAGS_VM) || (is_long_mode(vcpu) && !cs.l)) { kvm_queue_exception(vcpu, UD_VECTOR); return 0; } if (vmx_get_cpl(vcpu)) { kvm_inject_gp(vcpu, 0); return 0; } return 1; } /* * Free whatever needs to be freed from vmx->nested when L1 goes down, or * just stops using VMX. */ static void free_nested(struct vcpu_vmx *vmx) { if (!vmx->nested.vmxon) return; vmx->nested.vmxon = false; if (vmx->nested.current_vmptr != -1ull) { kunmap(vmx->nested.current_vmcs12_page); nested_release_page(vmx->nested.current_vmcs12_page); vmx->nested.current_vmptr = -1ull; vmx->nested.current_vmcs12 = NULL; } /* Unpin physical memory we referred to in current vmcs02 */ if (vmx->nested.apic_access_page) { nested_release_page(vmx->nested.apic_access_page); vmx->nested.apic_access_page = 0; } nested_free_all_saved_vmcss(vmx); } /* Emulate the VMXOFF instruction */ static int handle_vmoff(struct kvm_vcpu *vcpu) { if (!nested_vmx_check_permission(vcpu)) return 1; free_nested(to_vmx(vcpu)); skip_emulated_instruction(vcpu); return 1; } /* * Decode the memory-address operand of a vmx instruction, as recorded on an * exit caused by such an instruction (run by a guest hypervisor). * On success, returns 0. When the operand is invalid, returns 1 and throws * #UD or #GP. */ static int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification, u32 vmx_instruction_info, gva_t *ret) { /* * According to Vol. 3B, "Information for VM Exits Due to Instruction * Execution", on an exit, vmx_instruction_info holds most of the * addressing components of the operand. Only the displacement part * is put in exit_qualification (see 3B, "Basic VM-Exit Information"). * For how an actual address is calculated from all these components, * refer to Vol. 1, "Operand Addressing". */ int scaling = vmx_instruction_info & 3; int addr_size = (vmx_instruction_info >> 7) & 7; bool is_reg = vmx_instruction_info & (1u << 10); int seg_reg = (vmx_instruction_info >> 15) & 7; int index_reg = (vmx_instruction_info >> 18) & 0xf; bool index_is_valid = !(vmx_instruction_info & (1u << 22)); int base_reg = (vmx_instruction_info >> 23) & 0xf; bool base_is_valid = !(vmx_instruction_info & (1u << 27)); if (is_reg) { kvm_queue_exception(vcpu, UD_VECTOR); return 1; } /* Addr = segment_base + offset */ /* offset = base + [index * scale] + displacement */ *ret = vmx_get_segment_base(vcpu, seg_reg); if (base_is_valid) *ret += kvm_register_read(vcpu, base_reg); if (index_is_valid) *ret += kvm_register_read(vcpu, index_reg)<nested.current_vmptr == -1ull) { /* * failValid writes the error number to the current VMCS, which * can't be done there isn't a current VMCS. */ nested_vmx_failInvalid(vcpu); return; } vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu) & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_SF | X86_EFLAGS_OF)) | X86_EFLAGS_ZF); get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error; } /* Emulate the VMCLEAR instruction */ static int handle_vmclear(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); gva_t gva; gpa_t vmptr; struct vmcs12 *vmcs12; struct page *page; struct x86_exception e; if (!nested_vmx_check_permission(vcpu)) return 1; if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION), vmcs_read32(VMX_INSTRUCTION_INFO), &gva)) return 1; if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr, sizeof(vmptr), &e)) { kvm_inject_page_fault(vcpu, &e); return 1; } if (!IS_ALIGNED(vmptr, PAGE_SIZE)) { nested_vmx_failValid(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS); skip_emulated_instruction(vcpu); return 1; } if (vmptr == vmx->nested.current_vmptr) { kunmap(vmx->nested.current_vmcs12_page); nested_release_page(vmx->nested.current_vmcs12_page); vmx->nested.current_vmptr = -1ull; vmx->nested.current_vmcs12 = NULL; } page = nested_get_page(vcpu, vmptr); if (page == NULL) { /* * For accurate processor emulation, VMCLEAR beyond available * physical memory should do nothing at all. However, it is * possible that a nested vmx bug, not a guest hypervisor bug, * resulted in this case, so let's shut down before doing any * more damage: */ kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); return 1; } vmcs12 = kmap(page); vmcs12->launch_state = 0; kunmap(page); nested_release_page(page); nested_free_vmcs02(vmx, vmptr); skip_emulated_instruction(vcpu); nested_vmx_succeed(vcpu); return 1; } static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch); /* Emulate the VMLAUNCH instruction */ static int handle_vmlaunch(struct kvm_vcpu *vcpu) { return nested_vmx_run(vcpu, true); } /* Emulate the VMRESUME instruction */ static int handle_vmresume(struct kvm_vcpu *vcpu) { return nested_vmx_run(vcpu, false); } enum vmcs_field_type { VMCS_FIELD_TYPE_U16 = 0, VMCS_FIELD_TYPE_U64 = 1, VMCS_FIELD_TYPE_U32 = 2, VMCS_FIELD_TYPE_NATURAL_WIDTH = 3 }; static inline int vmcs_field_type(unsigned long field) { if (0x1 & field) /* the *_HIGH fields are all 32 bit */ return VMCS_FIELD_TYPE_U32; return (field >> 13) & 0x3 ; } static inline int vmcs_field_readonly(unsigned long field) { return (((field >> 10) & 0x3) == 1); } /* * Read a vmcs12 field. Since these can have varying lengths and we return * one type, we chose the biggest type (u64) and zero-extend the return value * to that size. Note that the caller, handle_vmread, might need to use only * some of the bits we return here (e.g., on 32-bit guests, only 32 bits of * 64-bit fields are to be returned). */ static inline bool vmcs12_read_any(struct kvm_vcpu *vcpu, unsigned long field, u64 *ret) { short offset = vmcs_field_to_offset(field); char *p; if (offset < 0) return 0; p = ((char *)(get_vmcs12(vcpu))) + offset; switch (vmcs_field_type(field)) { case VMCS_FIELD_TYPE_NATURAL_WIDTH: *ret = *((natural_width *)p); return 1; case VMCS_FIELD_TYPE_U16: *ret = *((u16 *)p); return 1; case VMCS_FIELD_TYPE_U32: *ret = *((u32 *)p); return 1; case VMCS_FIELD_TYPE_U64: *ret = *((u64 *)p); return 1; default: return 0; /* can never happen. */ } } /* * VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was * used before) all generate the same failure when it is missing. */ static int nested_vmx_check_vmcs12(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); if (vmx->nested.current_vmptr == -1ull) { nested_vmx_failInvalid(vcpu); skip_emulated_instruction(vcpu); return 0; } return 1; } static int handle_vmread(struct kvm_vcpu *vcpu) { unsigned long field; u64 field_value; unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); gva_t gva = 0; if (!nested_vmx_check_permission(vcpu) || !nested_vmx_check_vmcs12(vcpu)) return 1; /* Decode instruction info and find the field to read */ field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); /* Read the field, zero-extended to a u64 field_value */ if (!vmcs12_read_any(vcpu, field, &field_value)) { nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT); skip_emulated_instruction(vcpu); return 1; } /* * Now copy part of this value to register or memory, as requested. * Note that the number of bits actually copied is 32 or 64 depending * on the guest's mode (32 or 64 bit), not on the given field's length. */ if (vmx_instruction_info & (1u << 10)) { kvm_register_write(vcpu, (((vmx_instruction_info) >> 3) & 0xf), field_value); } else { if (get_vmx_mem_address(vcpu, exit_qualification, vmx_instruction_info, &gva)) return 1; /* _system ok, as nested_vmx_check_permission verified cpl=0 */ kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, gva, &field_value, (is_long_mode(vcpu) ? 8 : 4), NULL); } nested_vmx_succeed(vcpu); skip_emulated_instruction(vcpu); return 1; } static int handle_vmwrite(struct kvm_vcpu *vcpu) { unsigned long field; gva_t gva; unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); char *p; short offset; /* The value to write might be 32 or 64 bits, depending on L1's long * mode, and eventually we need to write that into a field of several * possible lengths. The code below first zero-extends the value to 64 * bit (field_value), and then copies only the approriate number of * bits into the vmcs12 field. */ u64 field_value = 0; struct x86_exception e; if (!nested_vmx_check_permission(vcpu) || !nested_vmx_check_vmcs12(vcpu)) return 1; if (vmx_instruction_info & (1u << 10)) field_value = kvm_register_read(vcpu, (((vmx_instruction_info) >> 3) & 0xf)); else { if (get_vmx_mem_address(vcpu, exit_qualification, vmx_instruction_info, &gva)) return 1; if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &field_value, (is_long_mode(vcpu) ? 8 : 4), &e)) { kvm_inject_page_fault(vcpu, &e); return 1; } } field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); if (vmcs_field_readonly(field)) { nested_vmx_failValid(vcpu, VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT); skip_emulated_instruction(vcpu); return 1; } offset = vmcs_field_to_offset(field); if (offset < 0) { nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT); skip_emulated_instruction(vcpu); return 1; } p = ((char *) get_vmcs12(vcpu)) + offset; switch (vmcs_field_type(field)) { case VMCS_FIELD_TYPE_U16: *(u16 *)p = field_value; break; case VMCS_FIELD_TYPE_U32: *(u32 *)p = field_value; break; case VMCS_FIELD_TYPE_U64: *(u64 *)p = field_value; break; case VMCS_FIELD_TYPE_NATURAL_WIDTH: *(natural_width *)p = field_value; break; default: nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT); skip_emulated_instruction(vcpu); return 1; } nested_vmx_succeed(vcpu); skip_emulated_instruction(vcpu); return 1; } /* Emulate the VMPTRLD instruction */ static int handle_vmptrld(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); gva_t gva; gpa_t vmptr; struct x86_exception e; if (!nested_vmx_check_permission(vcpu)) return 1; if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION), vmcs_read32(VMX_INSTRUCTION_INFO), &gva)) return 1; if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr, sizeof(vmptr), &e)) { kvm_inject_page_fault(vcpu, &e); return 1; } if (!IS_ALIGNED(vmptr, PAGE_SIZE)) { nested_vmx_failValid(vcpu, VMXERR_VMPTRLD_INVALID_ADDRESS); skip_emulated_instruction(vcpu); return 1; } if (vmx->nested.current_vmptr != vmptr) { struct vmcs12 *new_vmcs12; struct page *page; page = nested_get_page(vcpu, vmptr); if (page == NULL) { nested_vmx_failInvalid(vcpu); skip_emulated_instruction(vcpu); return 1; } new_vmcs12 = kmap(page); if (new_vmcs12->revision_id != VMCS12_REVISION) { kunmap(page); nested_release_page_clean(page); nested_vmx_failValid(vcpu, VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID); skip_emulated_instruction(vcpu); return 1; } if (vmx->nested.current_vmptr != -1ull) { kunmap(vmx->nested.current_vmcs12_page); nested_release_page(vmx->nested.current_vmcs12_page); } vmx->nested.current_vmptr = vmptr; vmx->nested.current_vmcs12 = new_vmcs12; vmx->nested.current_vmcs12_page = page; } nested_vmx_succeed(vcpu); skip_emulated_instruction(vcpu); return 1; } /* Emulate the VMPTRST instruction */ static int handle_vmptrst(struct kvm_vcpu *vcpu) { unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); gva_t vmcs_gva; struct x86_exception e; if (!nested_vmx_check_permission(vcpu)) return 1; if (get_vmx_mem_address(vcpu, exit_qualification, vmx_instruction_info, &vmcs_gva)) return 1; /* ok to use *_system, as nested_vmx_check_permission verified cpl=0 */ if (kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, vmcs_gva, (void *)&to_vmx(vcpu)->nested.current_vmptr, sizeof(u64), &e)) { kvm_inject_page_fault(vcpu, &e); return 1; } nested_vmx_succeed(vcpu); skip_emulated_instruction(vcpu); return 1; } /* * The exit handlers return 1 if the exit was handled fully and guest execution * may resume. Otherwise they set the kvm_run parameter to indicate what needs * to be done to userspace and return 0. */ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = { [EXIT_REASON_EXCEPTION_NMI] = handle_exception, [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt, [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault, [EXIT_REASON_NMI_WINDOW] = handle_nmi_window, [EXIT_REASON_IO_INSTRUCTION] = handle_io, [EXIT_REASON_CR_ACCESS] = handle_cr, [EXIT_REASON_DR_ACCESS] = handle_dr, [EXIT_REASON_CPUID] = handle_cpuid, [EXIT_REASON_MSR_READ] = handle_rdmsr, [EXIT_REASON_MSR_WRITE] = handle_wrmsr, [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window, [EXIT_REASON_HLT] = handle_halt, [EXIT_REASON_INVD] = handle_invd, [EXIT_REASON_INVLPG] = handle_invlpg, [EXIT_REASON_RDPMC] = handle_rdpmc, [EXIT_REASON_VMCALL] = handle_vmcall, [EXIT_REASON_VMCLEAR] = handle_vmclear, [EXIT_REASON_VMLAUNCH] = handle_vmlaunch, [EXIT_REASON_VMPTRLD] = handle_vmptrld, [EXIT_REASON_VMPTRST] = handle_vmptrst, [EXIT_REASON_VMREAD] = handle_vmread, [EXIT_REASON_VMRESUME] = handle_vmresume, [EXIT_REASON_VMWRITE] = handle_vmwrite, [EXIT_REASON_VMOFF] = handle_vmoff, [EXIT_REASON_VMON] = handle_vmon, [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold, [EXIT_REASON_APIC_ACCESS] = handle_apic_access, [EXIT_REASON_WBINVD] = handle_wbinvd, [EXIT_REASON_XSETBV] = handle_xsetbv, [EXIT_REASON_TASK_SWITCH] = handle_task_switch, [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check, [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation, [EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig, [EXIT_REASON_PAUSE_INSTRUCTION] = handle_pause, [EXIT_REASON_MWAIT_INSTRUCTION] = handle_invalid_op, [EXIT_REASON_MONITOR_INSTRUCTION] = handle_invalid_op, }; static const int kvm_vmx_max_exit_handlers = ARRAY_SIZE(kvm_vmx_exit_handlers); /* * Return 1 if we should exit from L2 to L1 to handle an MSR access access, * rather than handle it ourselves in L0. I.e., check whether L1 expressed * disinterest in the current event (read or write a specific MSR) by using an * MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps. */ static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, u32 exit_reason) { u32 msr_index = vcpu->arch.regs[VCPU_REGS_RCX]; gpa_t bitmap; if (!nested_cpu_has(get_vmcs12(vcpu), CPU_BASED_USE_MSR_BITMAPS)) return 1; /* * The MSR_BITMAP page is divided into four 1024-byte bitmaps, * for the four combinations of read/write and low/high MSR numbers. * First we need to figure out which of the four to use: */ bitmap = vmcs12->msr_bitmap; if (exit_reason == EXIT_REASON_MSR_WRITE) bitmap += 2048; if (msr_index >= 0xc0000000) { msr_index -= 0xc0000000; bitmap += 1024; } /* Then read the msr_index'th bit from this bitmap: */ if (msr_index < 1024*8) { unsigned char b; kvm_read_guest(vcpu->kvm, bitmap + msr_index/8, &b, 1); return 1 & (b >> (msr_index & 7)); } else return 1; /* let L1 handle the wrong parameter */ } /* * Return 1 if we should exit from L2 to L1 to handle a CR access exit, * rather than handle it ourselves in L0. I.e., check if L1 wanted to * intercept (via guest_host_mask etc.) the current event. */ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); int cr = exit_qualification & 15; int reg = (exit_qualification >> 8) & 15; unsigned long val = kvm_register_read(vcpu, reg); switch ((exit_qualification >> 4) & 3) { case 0: /* mov to cr */ switch (cr) { case 0: if (vmcs12->cr0_guest_host_mask & (val ^ vmcs12->cr0_read_shadow)) return 1; break; case 3: if ((vmcs12->cr3_target_count >= 1 && vmcs12->cr3_target_value0 == val) || (vmcs12->cr3_target_count >= 2 && vmcs12->cr3_target_value1 == val) || (vmcs12->cr3_target_count >= 3 && vmcs12->cr3_target_value2 == val) || (vmcs12->cr3_target_count >= 4 && vmcs12->cr3_target_value3 == val)) return 0; if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING)) return 1; break; case 4: if (vmcs12->cr4_guest_host_mask & (vmcs12->cr4_read_shadow ^ val)) return 1; break; case 8: if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING)) return 1; break; } break; case 2: /* clts */ if ((vmcs12->cr0_guest_host_mask & X86_CR0_TS) && (vmcs12->cr0_read_shadow & X86_CR0_TS)) return 1; break; case 1: /* mov from cr */ switch (cr) { case 3: if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_CR3_STORE_EXITING) return 1; break; case 8: if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_CR8_STORE_EXITING) return 1; break; } break; case 3: /* lmsw */ /* * lmsw can change bits 1..3 of cr0, and only set bit 0 of * cr0. Other attempted changes are ignored, with no exit. */ if (vmcs12->cr0_guest_host_mask & 0xe & (val ^ vmcs12->cr0_read_shadow)) return 1; if ((vmcs12->cr0_guest_host_mask & 0x1) && !(vmcs12->cr0_read_shadow & 0x1) && (val & 0x1)) return 1; break; } return 0; } /* * Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we * should handle it ourselves in L0 (and then continue L2). Only call this * when in is_guest_mode (L2). */ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu) { u32 exit_reason = vmcs_read32(VM_EXIT_REASON); u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO); struct vcpu_vmx *vmx = to_vmx(vcpu); struct vmcs12 *vmcs12 = get_vmcs12(vcpu); if (vmx->nested.nested_run_pending) return 0; if (unlikely(vmx->fail)) { pr_info_ratelimited("%s failed vm entry %x\n", __func__, vmcs_read32(VM_INSTRUCTION_ERROR)); return 1; } switch (exit_reason) { case EXIT_REASON_EXCEPTION_NMI: if (!is_exception(intr_info)) return 0; else if (is_page_fault(intr_info)) return enable_ept; return vmcs12->exception_bitmap & (1u << (intr_info & INTR_INFO_VECTOR_MASK)); case EXIT_REASON_EXTERNAL_INTERRUPT: return 0; case EXIT_REASON_TRIPLE_FAULT: return 1; case EXIT_REASON_PENDING_INTERRUPT: case EXIT_REASON_NMI_WINDOW: /* * prepare_vmcs02() set the CPU_BASED_VIRTUAL_INTR_PENDING bit * (aka Interrupt Window Exiting) only when L1 turned it on, * so if we got a PENDING_INTERRUPT exit, this must be for L1. * Same for NMI Window Exiting. */ return 1; case EXIT_REASON_TASK_SWITCH: return 1; case EXIT_REASON_CPUID: return 1; case EXIT_REASON_HLT: return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING); case EXIT_REASON_INVD: return 1; case EXIT_REASON_INVLPG: return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING); case EXIT_REASON_RDPMC: return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING); case EXIT_REASON_RDTSC: return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING); case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR: case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD: case EXIT_REASON_VMPTRST: case EXIT_REASON_VMREAD: case EXIT_REASON_VMRESUME: case EXIT_REASON_VMWRITE: case EXIT_REASON_VMOFF: case EXIT_REASON_VMON: /* * VMX instructions trap unconditionally. This allows L1 to * emulate them for its L2 guest, i.e., allows 3-level nesting! */ return 1; case EXIT_REASON_CR_ACCESS: return nested_vmx_exit_handled_cr(vcpu, vmcs12); case EXIT_REASON_DR_ACCESS: return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING); case EXIT_REASON_IO_INSTRUCTION: /* TODO: support IO bitmaps */ return 1; case EXIT_REASON_MSR_READ: case EXIT_REASON_MSR_WRITE: return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason); case EXIT_REASON_INVALID_STATE: return 1; case EXIT_REASON_MWAIT_INSTRUCTION: return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING); case EXIT_REASON_MONITOR_INSTRUCTION: return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING); case EXIT_REASON_PAUSE_INSTRUCTION: return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) || nested_cpu_has2(vmcs12, SECONDARY_EXEC_PAUSE_LOOP_EXITING); case EXIT_REASON_MCE_DURING_VMENTRY: return 0; case EXIT_REASON_TPR_BELOW_THRESHOLD: return 1; case EXIT_REASON_APIC_ACCESS: return nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES); case EXIT_REASON_EPT_VIOLATION: case EXIT_REASON_EPT_MISCONFIG: return 0; case EXIT_REASON_WBINVD: return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING); case EXIT_REASON_XSETBV: return 1; default: return 1; } } static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2) { *info1 = vmcs_readl(EXIT_QUALIFICATION); *info2 = vmcs_read32(VM_EXIT_INTR_INFO); } /* * The guest has exited. See if we can fix it or if we need userspace * assistance. */ static int vmx_handle_exit(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); u32 exit_reason = vmx->exit_reason; u32 vectoring_info = vmx->idt_vectoring_info; /* If guest state is invalid, start emulating */ if (vmx->emulation_required && emulate_invalid_guest_state) return handle_invalid_guest_state(vcpu); /* * the KVM_REQ_EVENT optimization bit is only on for one entry, and if * we did not inject a still-pending event to L1 now because of * nested_run_pending, we need to re-enable this bit. */ if (vmx->nested.nested_run_pending) kvm_make_request(KVM_REQ_EVENT, vcpu); if (!is_guest_mode(vcpu) && (exit_reason == EXIT_REASON_VMLAUNCH || exit_reason == EXIT_REASON_VMRESUME)) vmx->nested.nested_run_pending = 1; else vmx->nested.nested_run_pending = 0; if (is_guest_mode(vcpu) && nested_vmx_exit_handled(vcpu)) { nested_vmx_vmexit(vcpu); return 1; } if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) { vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; vcpu->run->fail_entry.hardware_entry_failure_reason = exit_reason; return 0; } if (unlikely(vmx->fail)) { vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; vcpu->run->fail_entry.hardware_entry_failure_reason = vmcs_read32(VM_INSTRUCTION_ERROR); return 0; } if ((vectoring_info & VECTORING_INFO_VALID_MASK) && (exit_reason != EXIT_REASON_EXCEPTION_NMI && exit_reason != EXIT_REASON_EPT_VIOLATION && exit_reason != EXIT_REASON_TASK_SWITCH)) printk(KERN_WARNING "%s: unexpected, valid vectoring info " "(0x%x) and exit reason is 0x%x\n", __func__, vectoring_info, exit_reason); if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked && !(is_guest_mode(vcpu) && nested_cpu_has_virtual_nmis( get_vmcs12(vcpu), vcpu)))) { if (vmx_interrupt_allowed(vcpu)) { vmx->soft_vnmi_blocked = 0; } else if (vmx->vnmi_blocked_time > 1000000000LL && vcpu->arch.nmi_pending) { /* * This CPU don't support us in finding the end of an * NMI-blocked window if the guest runs with IRQs * disabled. So we pull the trigger after 1 s of * futile waiting, but inform the user about this. */ printk(KERN_WARNING "%s: Breaking out of NMI-blocked " "state on VCPU %d after 1 s timeout\n", __func__, vcpu->vcpu_id); vmx->soft_vnmi_blocked = 0; } } if (exit_reason < kvm_vmx_max_exit_handlers && kvm_vmx_exit_handlers[exit_reason]) return kvm_vmx_exit_handlers[exit_reason](vcpu); else { vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; vcpu->run->hw.hardware_exit_reason = exit_reason; } return 0; } static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr) { if (irr == -1 || tpr < irr) { vmcs_write32(TPR_THRESHOLD, 0); return; } vmcs_write32(TPR_THRESHOLD, irr); } static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx) { u32 exit_intr_info; if (!(vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY || vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI)) return; vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); exit_intr_info = vmx->exit_intr_info; /* Handle machine checks before interrupts are enabled */ if (is_machine_check(exit_intr_info)) kvm_machine_check(); /* We need to handle NMIs before interrupts are enabled */ if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR && (exit_intr_info & INTR_INFO_VALID_MASK)) { kvm_before_handle_nmi(&vmx->vcpu); asm("int $2"); kvm_after_handle_nmi(&vmx->vcpu); } } static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx) { u32 exit_intr_info; bool unblock_nmi; u8 vector; bool idtv_info_valid; idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK; if (cpu_has_virtual_nmis()) { if (vmx->nmi_known_unmasked) return; /* * Can't use vmx->exit_intr_info since we're not sure what * the exit reason is. */ exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0; vector = exit_intr_info & INTR_INFO_VECTOR_MASK; /* * SDM 3: 27.7.1.2 (September 2008) * Re-set bit "block by NMI" before VM entry if vmexit caused by * a guest IRET fault. * SDM 3: 23.2.2 (September 2008) * Bit 12 is undefined in any of the following cases: * If the VM exit sets the valid bit in the IDT-vectoring * information field. * If the VM exit is due to a double fault. */ if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi && vector != DF_VECTOR && !idtv_info_valid) vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); else vmx->nmi_known_unmasked = !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI); } else if (unlikely(vmx->soft_vnmi_blocked)) vmx->vnmi_blocked_time += ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time)); } static void __vmx_complete_interrupts(struct vcpu_vmx *vmx, u32 idt_vectoring_info, int instr_len_field, int error_code_field) { u8 vector; int type; bool idtv_info_valid; idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK; vmx->vcpu.arch.nmi_injected = false; kvm_clear_exception_queue(&vmx->vcpu); kvm_clear_interrupt_queue(&vmx->vcpu); if (!idtv_info_valid) return; kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu); vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK; type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK; switch (type) { case INTR_TYPE_NMI_INTR: vmx->vcpu.arch.nmi_injected = true; /* * SDM 3: 27.7.1.2 (September 2008) * Clear bit "block by NMI" before VM entry if a NMI * delivery faulted. */ vmx_set_nmi_mask(&vmx->vcpu, false); break; case INTR_TYPE_SOFT_EXCEPTION: vmx->vcpu.arch.event_exit_inst_len = vmcs_read32(instr_len_field); /* fall through */ case INTR_TYPE_HARD_EXCEPTION: if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) { u32 err = vmcs_read32(error_code_field); kvm_queue_exception_e(&vmx->vcpu, vector, err); } else kvm_queue_exception(&vmx->vcpu, vector); break; case INTR_TYPE_SOFT_INTR: vmx->vcpu.arch.event_exit_inst_len = vmcs_read32(instr_len_field); /* fall through */ case INTR_TYPE_EXT_INTR: kvm_queue_interrupt(&vmx->vcpu, vector, type == INTR_TYPE_SOFT_INTR); break; default: break; } } static void vmx_complete_interrupts(struct vcpu_vmx *vmx) { if (is_guest_mode(&vmx->vcpu)) return; __vmx_complete_interrupts(vmx, vmx->idt_vectoring_info, VM_EXIT_INSTRUCTION_LEN, IDT_VECTORING_ERROR_CODE); } static void vmx_cancel_injection(struct kvm_vcpu *vcpu) { if (is_guest_mode(vcpu)) return; __vmx_complete_interrupts(to_vmx(vcpu), vmcs_read32(VM_ENTRY_INTR_INFO_FIELD), VM_ENTRY_INSTRUCTION_LEN, VM_ENTRY_EXCEPTION_ERROR_CODE); vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); } static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) { int i, nr_msrs; struct perf_guest_switch_msr *msrs; msrs = perf_guest_get_msrs(&nr_msrs); if (!msrs) return; for (i = 0; i < nr_msrs; i++) if (msrs[i].host == msrs[i].guest) clear_atomic_switch_msr(vmx, msrs[i].msr); else add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest, msrs[i].host); } #ifdef CONFIG_X86_64 #define R "r" #define Q "q" #else #define R "e" #define Q "l" #endif static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); if (is_guest_mode(vcpu) && !vmx->nested.nested_run_pending) { struct vmcs12 *vmcs12 = get_vmcs12(vcpu); if (vmcs12->idt_vectoring_info_field & VECTORING_INFO_VALID_MASK) { vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, vmcs12->idt_vectoring_info_field); vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, vmcs12->vm_exit_instruction_len); if (vmcs12->idt_vectoring_info_field & VECTORING_INFO_DELIVER_CODE_MASK) vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, vmcs12->idt_vectoring_error_code); } } /* Record the guest's net vcpu time for enforced NMI injections. */ if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) vmx->entry_time = ktime_get(); /* Don't enter VMX if guest state is invalid, let the exit handler start emulation until we arrive back to a valid state */ if (vmx->emulation_required && emulate_invalid_guest_state) return; if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty)) vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]); if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty)) vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]); /* When single-stepping over STI and MOV SS, we must clear the * corresponding interruptibility bits in the guest state. Otherwise * vmentry fails as it then expects bit 14 (BS) in pending debug * exceptions being set, but that's not correct for the guest debugging * case. */ if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) vmx_set_interrupt_shadow(vcpu, 0); atomic_switch_perf_msrs(vmx); vmx->__launched = vmx->loaded_vmcs->launched; asm( /* Store host registers */ "push %%"R"dx; push %%"R"bp;" "push %%"R"cx \n\t" /* placeholder for guest rcx */ "push %%"R"cx \n\t" "cmp %%"R"sp, %c[host_rsp](%0) \n\t" "je 1f \n\t" "mov %%"R"sp, %c[host_rsp](%0) \n\t" __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t" "1: \n\t" /* Reload cr2 if changed */ "mov %c[cr2](%0), %%"R"ax \n\t" "mov %%cr2, %%"R"dx \n\t" "cmp %%"R"ax, %%"R"dx \n\t" "je 2f \n\t" "mov %%"R"ax, %%cr2 \n\t" "2: \n\t" /* Check if vmlaunch of vmresume is needed */ "cmpl $0, %c[launched](%0) \n\t" /* Load guest registers. Don't clobber flags. */ "mov %c[rax](%0), %%"R"ax \n\t" "mov %c[rbx](%0), %%"R"bx \n\t" "mov %c[rdx](%0), %%"R"dx \n\t" "mov %c[rsi](%0), %%"R"si \n\t" "mov %c[rdi](%0), %%"R"di \n\t" "mov %c[rbp](%0), %%"R"bp \n\t" #ifdef CONFIG_X86_64 "mov %c[r8](%0), %%r8 \n\t" "mov %c[r9](%0), %%r9 \n\t" "mov %c[r10](%0), %%r10 \n\t" "mov %c[r11](%0), %%r11 \n\t" "mov %c[r12](%0), %%r12 \n\t" "mov %c[r13](%0), %%r13 \n\t" "mov %c[r14](%0), %%r14 \n\t" "mov %c[r15](%0), %%r15 \n\t" #endif "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */ /* Enter guest mode */ "jne .Llaunched \n\t" __ex(ASM_VMX_VMLAUNCH) "\n\t" "jmp .Lkvm_vmx_return \n\t" ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t" ".Lkvm_vmx_return: " /* Save guest registers, load host registers, keep flags */ "mov %0, %c[wordsize](%%"R"sp) \n\t" "pop %0 \n\t" "mov %%"R"ax, %c[rax](%0) \n\t" "mov %%"R"bx, %c[rbx](%0) \n\t" "pop"Q" %c[rcx](%0) \n\t" "mov %%"R"dx, %c[rdx](%0) \n\t" "mov %%"R"si, %c[rsi](%0) \n\t" "mov %%"R"di, %c[rdi](%0) \n\t" "mov %%"R"bp, %c[rbp](%0) \n\t" #ifdef CONFIG_X86_64 "mov %%r8, %c[r8](%0) \n\t" "mov %%r9, %c[r9](%0) \n\t" "mov %%r10, %c[r10](%0) \n\t" "mov %%r11, %c[r11](%0) \n\t" "mov %%r12, %c[r12](%0) \n\t" "mov %%r13, %c[r13](%0) \n\t" "mov %%r14, %c[r14](%0) \n\t" "mov %%r15, %c[r15](%0) \n\t" #endif "mov %%cr2, %%"R"ax \n\t" "mov %%"R"ax, %c[cr2](%0) \n\t" "pop %%"R"bp; pop %%"R"dx \n\t" "setbe %c[fail](%0) \n\t" : : "c"(vmx), "d"((unsigned long)HOST_RSP), [launched]"i"(offsetof(struct vcpu_vmx, __launched)), [fail]"i"(offsetof(struct vcpu_vmx, fail)), [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)), [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])), [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])), [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])), [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])), [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])), [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])), [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])), #ifdef CONFIG_X86_64 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])), [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])), [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])), [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])), [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])), [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])), [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])), [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])), #endif [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)), [wordsize]"i"(sizeof(ulong)) : "cc", "memory" , R"ax", R"bx", R"di", R"si" #ifdef CONFIG_X86_64 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" #endif ); vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP) | (1 << VCPU_EXREG_RFLAGS) | (1 << VCPU_EXREG_CPL) | (1 << VCPU_EXREG_PDPTR) | (1 << VCPU_EXREG_SEGMENTS) | (1 << VCPU_EXREG_CR3)); vcpu->arch.regs_dirty = 0; vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); if (is_guest_mode(vcpu)) { struct vmcs12 *vmcs12 = get_vmcs12(vcpu); vmcs12->idt_vectoring_info_field = vmx->idt_vectoring_info; if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) { vmcs12->idt_vectoring_error_code = vmcs_read32(IDT_VECTORING_ERROR_CODE); vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); } } asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS)); vmx->loaded_vmcs->launched = 1; vmx->exit_reason = vmcs_read32(VM_EXIT_REASON); trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX); vmx_complete_atomic_exit(vmx); vmx_recover_nmi_blocking(vmx); vmx_complete_interrupts(vmx); } #undef R #undef Q static void vmx_free_vcpu(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); free_vpid(vmx); free_nested(vmx); free_loaded_vmcs(vmx->loaded_vmcs); kfree(vmx->guest_msrs); kvm_vcpu_uninit(vcpu); kmem_cache_free(kvm_vcpu_cache, vmx); } static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) { int err; struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); int cpu; if (!vmx) return ERR_PTR(-ENOMEM); allocate_vpid(vmx); err = kvm_vcpu_init(&vmx->vcpu, kvm, id); if (err) goto free_vcpu; vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL); err = -ENOMEM; if (!vmx->guest_msrs) { goto uninit_vcpu; } vmx->loaded_vmcs = &vmx->vmcs01; vmx->loaded_vmcs->vmcs = alloc_vmcs(); if (!vmx->loaded_vmcs->vmcs) goto free_msrs; if (!vmm_exclusive) kvm_cpu_vmxon(__pa(per_cpu(vmxarea, raw_smp_processor_id()))); loaded_vmcs_init(vmx->loaded_vmcs); if (!vmm_exclusive) kvm_cpu_vmxoff(); cpu = get_cpu(); vmx_vcpu_load(&vmx->vcpu, cpu); vmx->vcpu.cpu = cpu; err = vmx_vcpu_setup(vmx); vmx_vcpu_put(&vmx->vcpu); put_cpu(); if (err) goto free_vmcs; if (vm_need_virtualize_apic_accesses(kvm)) err = alloc_apic_access_page(kvm); if (err) goto free_vmcs; if (enable_ept) { if (!kvm->arch.ept_identity_map_addr) kvm->arch.ept_identity_map_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR; err = -ENOMEM; if (alloc_identity_pagetable(kvm) != 0) goto free_vmcs; if (!init_rmode_identity_map(kvm)) goto free_vmcs; } vmx->nested.current_vmptr = -1ull; vmx->nested.current_vmcs12 = NULL; return &vmx->vcpu; free_vmcs: free_vmcs(vmx->loaded_vmcs->vmcs); free_msrs: kfree(vmx->guest_msrs); uninit_vcpu: kvm_vcpu_uninit(&vmx->vcpu); free_vcpu: free_vpid(vmx); kmem_cache_free(kvm_vcpu_cache, vmx); return ERR_PTR(err); } static void __init vmx_check_processor_compat(void *rtn) { struct vmcs_config vmcs_conf; *(int *)rtn = 0; if (setup_vmcs_config(&vmcs_conf) < 0) *(int *)rtn = -EIO; if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) { printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n", smp_processor_id()); *(int *)rtn = -EIO; } } static int get_ept_level(void) { return VMX_EPT_DEFAULT_GAW + 1; } static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) { u64 ret; /* For VT-d and EPT combination * 1. MMIO: always map as UC * 2. EPT with VT-d: * a. VT-d without snooping control feature: can't guarantee the * result, try to trust guest. * b. VT-d with snooping control feature: snooping control feature of * VT-d engine can guarantee the cache correctness. Just set it * to WB to keep consistent with host. So the same as item 3. * 3. EPT without VT-d: always map as WB and set IPAT=1 to keep * consistent with host MTRR */ if (is_mmio) ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT; else if (vcpu->kvm->arch.iommu_domain && !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)) ret = kvm_get_guest_memory_type(vcpu, gfn) << VMX_EPT_MT_EPTE_SHIFT; else ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT) | VMX_EPT_IPAT_BIT; return ret; } static int vmx_get_lpage_level(void) { if (enable_ept && !cpu_has_vmx_ept_1g_page()) return PT_DIRECTORY_LEVEL; else /* For shadow and EPT supported 1GB page */ return PT_PDPE_LEVEL; } static void vmx_cpuid_update(struct kvm_vcpu *vcpu) { struct kvm_cpuid_entry2 *best; struct vcpu_vmx *vmx = to_vmx(vcpu); u32 exec_control; vmx->rdtscp_enabled = false; if (vmx_rdtscp_supported()) { exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); if (exec_control & SECONDARY_EXEC_RDTSCP) { best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); if (best && (best->edx & bit(X86_FEATURE_RDTSCP))) vmx->rdtscp_enabled = true; else { exec_control &= ~SECONDARY_EXEC_RDTSCP; vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); } } } } static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry) { if (func == 1 && nested) entry->ecx |= bit(X86_FEATURE_VMX); } /* * prepare_vmcs02 is called when the L1 guest hypervisor runs its nested * L2 guest. L1 has a vmcs for L2 (vmcs12), and this function "merges" it * with L0's requirements for its guest (a.k.a. vmsc01), so we can run the L2 * guest in a way that will both be appropriate to L1's requests, and our * needs. In addition to modifying the active vmcs (which is vmcs02), this * function also has additional necessary side-effects, like setting various * vcpu->arch fields. */ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { struct vcpu_vmx *vmx = to_vmx(vcpu); u32 exec_control; vmcs_write16(GUEST_ES_SELECTOR, vmcs12->guest_es_selector); vmcs_write16(GUEST_CS_SELECTOR, vmcs12->guest_cs_selector); vmcs_write16(GUEST_SS_SELECTOR, vmcs12->guest_ss_selector); vmcs_write16(GUEST_DS_SELECTOR, vmcs12->guest_ds_selector); vmcs_write16(GUEST_FS_SELECTOR, vmcs12->guest_fs_selector); vmcs_write16(GUEST_GS_SELECTOR, vmcs12->guest_gs_selector); vmcs_write16(GUEST_LDTR_SELECTOR, vmcs12->guest_ldtr_selector); vmcs_write16(GUEST_TR_SELECTOR, vmcs12->guest_tr_selector); vmcs_write32(GUEST_ES_LIMIT, vmcs12->guest_es_limit); vmcs_write32(GUEST_CS_LIMIT, vmcs12->guest_cs_limit); vmcs_write32(GUEST_SS_LIMIT, vmcs12->guest_ss_limit); vmcs_write32(GUEST_DS_LIMIT, vmcs12->guest_ds_limit); vmcs_write32(GUEST_FS_LIMIT, vmcs12->guest_fs_limit); vmcs_write32(GUEST_GS_LIMIT, vmcs12->guest_gs_limit); vmcs_write32(GUEST_LDTR_LIMIT, vmcs12->guest_ldtr_limit); vmcs_write32(GUEST_TR_LIMIT, vmcs12->guest_tr_limit); vmcs_write32(GUEST_GDTR_LIMIT, vmcs12->guest_gdtr_limit); vmcs_write32(GUEST_IDTR_LIMIT, vmcs12->guest_idtr_limit); vmcs_write32(GUEST_ES_AR_BYTES, vmcs12->guest_es_ar_bytes); vmcs_write32(GUEST_CS_AR_BYTES, vmcs12->guest_cs_ar_bytes); vmcs_write32(GUEST_SS_AR_BYTES, vmcs12->guest_ss_ar_bytes); vmcs_write32(GUEST_DS_AR_BYTES, vmcs12->guest_ds_ar_bytes); vmcs_write32(GUEST_FS_AR_BYTES, vmcs12->guest_fs_ar_bytes); vmcs_write32(GUEST_GS_AR_BYTES, vmcs12->guest_gs_ar_bytes); vmcs_write32(GUEST_LDTR_AR_BYTES, vmcs12->guest_ldtr_ar_bytes); vmcs_write32(GUEST_TR_AR_BYTES, vmcs12->guest_tr_ar_bytes); vmcs_writel(GUEST_ES_BASE, vmcs12->guest_es_base); vmcs_writel(GUEST_CS_BASE, vmcs12->guest_cs_base); vmcs_writel(GUEST_SS_BASE, vmcs12->guest_ss_base); vmcs_writel(GUEST_DS_BASE, vmcs12->guest_ds_base); vmcs_writel(GUEST_FS_BASE, vmcs12->guest_fs_base); vmcs_writel(GUEST_GS_BASE, vmcs12->guest_gs_base); vmcs_writel(GUEST_LDTR_BASE, vmcs12->guest_ldtr_base); vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base); vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base); vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base); vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl); vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, vmcs12->vm_entry_intr_info_field); vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, vmcs12->vm_entry_exception_error_code); vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, vmcs12->vm_entry_instruction_len); vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, vmcs12->guest_interruptibility_info); vmcs_write32(GUEST_ACTIVITY_STATE, vmcs12->guest_activity_state); vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs); vmcs_writel(GUEST_DR7, vmcs12->guest_dr7); vmcs_writel(GUEST_RFLAGS, vmcs12->guest_rflags); vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS, vmcs12->guest_pending_dbg_exceptions); vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->guest_sysenter_esp); vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->guest_sysenter_eip); vmcs_write64(VMCS_LINK_POINTER, -1ull); vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, (vmcs_config.pin_based_exec_ctrl | vmcs12->pin_based_vm_exec_control)); /* * Whether page-faults are trapped is determined by a combination of * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF. * If enable_ept, L0 doesn't care about page faults and we should * set all of these to L1's desires. However, if !enable_ept, L0 does * care about (at least some) page faults, and because it is not easy * (if at all possible?) to merge L0 and L1's desires, we simply ask * to exit on each and every L2 page fault. This is done by setting * MASK=MATCH=0 and (see below) EB.PF=1. * Note that below we don't need special code to set EB.PF beyond the * "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept, * vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when * !enable_ept, EB.PF is 1, so the "or" will always be 1. * * A problem with this approach (when !enable_ept) is that L1 may be * injected with more page faults than it asked for. This could have * caused problems, but in practice existing hypervisors don't care. * To fix this, we will need to emulate the PFEC checking (on the L1 * page tables), using walk_addr(), when injecting PFs to L1. */ vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, enable_ept ? vmcs12->page_fault_error_code_mask : 0); vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, enable_ept ? vmcs12->page_fault_error_code_match : 0); if (cpu_has_secondary_exec_ctrls()) { u32 exec_control = vmx_secondary_exec_control(vmx); if (!vmx->rdtscp_enabled) exec_control &= ~SECONDARY_EXEC_RDTSCP; /* Take the following fields only from vmcs12 */ exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; if (nested_cpu_has(vmcs12, CPU_BASED_ACTIVATE_SECONDARY_CONTROLS)) exec_control |= vmcs12->secondary_vm_exec_control; if (exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) { /* * Translate L1 physical address to host physical * address for vmcs02. Keep the page pinned, so this * physical address remains valid. We keep a reference * to it so we can release it later. */ if (vmx->nested.apic_access_page) /* shouldn't happen */ nested_release_page(vmx->nested.apic_access_page); vmx->nested.apic_access_page = nested_get_page(vcpu, vmcs12->apic_access_addr); /* * If translation failed, no matter: This feature asks * to exit when accessing the given address, and if it * can never be accessed, this feature won't do * anything anyway. */ if (!vmx->nested.apic_access_page) exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; else vmcs_write64(APIC_ACCESS_ADDR, page_to_phys(vmx->nested.apic_access_page)); } vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); } /* * Set host-state according to L0's settings (vmcs12 is irrelevant here) * Some constant fields are set here by vmx_set_constant_host_state(). * Other fields are different per CPU, and will be set later when * vmx_vcpu_load() is called, and when vmx_save_host_state() is called. */ vmx_set_constant_host_state(); /* * HOST_RSP is normally set correctly in vmx_vcpu_run() just before * entry, but only if the current (host) sp changed from the value * we wrote last (vmx->host_rsp). This cache is no longer relevant * if we switch vmcs, and rather than hold a separate cache per vmcs, * here we just force the write to happen on entry. */ vmx->host_rsp = 0; exec_control = vmx_exec_control(vmx); /* L0's desires */ exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING; exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING; exec_control &= ~CPU_BASED_TPR_SHADOW; exec_control |= vmcs12->cpu_based_vm_exec_control; /* * Merging of IO and MSR bitmaps not currently supported. * Rather, exit every time. */ exec_control &= ~CPU_BASED_USE_MSR_BITMAPS; exec_control &= ~CPU_BASED_USE_IO_BITMAPS; exec_control |= CPU_BASED_UNCOND_IO_EXITING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control); /* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the * bitwise-or of what L1 wants to trap for L2, and what we want to * trap. Note that CR0.TS also needs updating - we do this later. */ update_exception_bitmap(vcpu); vcpu->arch.cr0_guest_owned_bits &= ~vmcs12->cr0_guest_host_mask; vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); /* Note: IA32_MODE, LOAD_IA32_EFER are modified by vmx_set_efer below */ vmcs_write32(VM_EXIT_CONTROLS, vmcs12->vm_exit_controls | vmcs_config.vmexit_ctrl); vmcs_write32(VM_ENTRY_CONTROLS, vmcs12->vm_entry_controls | (vmcs_config.vmentry_ctrl & ~VM_ENTRY_IA32E_MODE)); if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT) vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat); else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); set_cr4_guest_host_mask(vmx); if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING) vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset + vmcs12->tsc_offset); else vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset); if (enable_vpid) { /* * Trivially support vpid by letting L2s share their parent * L1's vpid. TODO: move to a more elaborate solution, giving * each L2 its own vpid and exposing the vpid feature to L1. */ vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); vmx_flush_tlb(vcpu); } if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER) vcpu->arch.efer = vmcs12->guest_ia32_efer; if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) vcpu->arch.efer |= (EFER_LMA | EFER_LME); else vcpu->arch.efer &= ~(EFER_LMA | EFER_LME); /* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */ vmx_set_efer(vcpu, vcpu->arch.efer); /* * This sets GUEST_CR0 to vmcs12->guest_cr0, with possibly a modified * TS bit (for lazy fpu) and bits which we consider mandatory enabled. * The CR0_READ_SHADOW is what L2 should have expected to read given * the specifications by L1; It's not enough to take * vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we we * have more bits than L1 expected. */ vmx_set_cr0(vcpu, vmcs12->guest_cr0); vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12)); vmx_set_cr4(vcpu, vmcs12->guest_cr4); vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12)); /* shadow page tables on either EPT or shadow page tables */ kvm_set_cr3(vcpu, vmcs12->guest_cr3); kvm_mmu_reset_context(vcpu); kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp); kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->guest_rip); } /* * nested_vmx_run() handles a nested entry, i.e., a VMLAUNCH or VMRESUME on L1 * for running an L2 nested guest. */ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) { struct vmcs12 *vmcs12; struct vcpu_vmx *vmx = to_vmx(vcpu); int cpu; struct loaded_vmcs *vmcs02; if (!nested_vmx_check_permission(vcpu) || !nested_vmx_check_vmcs12(vcpu)) return 1; skip_emulated_instruction(vcpu); vmcs12 = get_vmcs12(vcpu); /* * The nested entry process starts with enforcing various prerequisites * on vmcs12 as required by the Intel SDM, and act appropriately when * they fail: As the SDM explains, some conditions should cause the * instruction to fail, while others will cause the instruction to seem * to succeed, but return an EXIT_REASON_INVALID_STATE. * To speed up the normal (success) code path, we should avoid checking * for misconfigurations which will anyway be caught by the processor * when using the merged vmcs02. */ if (vmcs12->launch_state == launch) { nested_vmx_failValid(vcpu, launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS : VMXERR_VMRESUME_NONLAUNCHED_VMCS); return 1; } if ((vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_MSR_BITMAPS) && !IS_ALIGNED(vmcs12->msr_bitmap, PAGE_SIZE)) { /*TODO: Also verify bits beyond physical address width are 0*/ nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); return 1; } if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) && !IS_ALIGNED(vmcs12->apic_access_addr, PAGE_SIZE)) { /*TODO: Also verify bits beyond physical address width are 0*/ nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); return 1; } if (vmcs12->vm_entry_msr_load_count > 0 || vmcs12->vm_exit_msr_load_count > 0 || vmcs12->vm_exit_msr_store_count > 0) { pr_warn_ratelimited("%s: VMCS MSR_{LOAD,STORE} unsupported\n", __func__); nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); return 1; } if (!vmx_control_verify(vmcs12->cpu_based_vm_exec_control, nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high) || !vmx_control_verify(vmcs12->secondary_vm_exec_control, nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high) || !vmx_control_verify(vmcs12->pin_based_vm_exec_control, nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high) || !vmx_control_verify(vmcs12->vm_exit_controls, nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high) || !vmx_control_verify(vmcs12->vm_entry_controls, nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high)) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); return 1; } if (((vmcs12->host_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) || ((vmcs12->host_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); return 1; } if (((vmcs12->guest_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) || ((vmcs12->guest_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) { nested_vmx_entry_failure(vcpu, vmcs12, EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT); return 1; } if (vmcs12->vmcs_link_pointer != -1ull) { nested_vmx_entry_failure(vcpu, vmcs12, EXIT_REASON_INVALID_STATE, ENTRY_FAIL_VMCS_LINK_PTR); return 1; } /* * We're finally done with prerequisite checking, and can start with * the nested entry. */ vmcs02 = nested_get_current_vmcs02(vmx); if (!vmcs02) return -ENOMEM; enter_guest_mode(vcpu); vmx->nested.vmcs01_tsc_offset = vmcs_read64(TSC_OFFSET); cpu = get_cpu(); vmx->loaded_vmcs = vmcs02; vmx_vcpu_put(vcpu); vmx_vcpu_load(vcpu, cpu); vcpu->cpu = cpu; put_cpu(); vmcs12->launch_state = 1; prepare_vmcs02(vcpu, vmcs12); /* * Note no nested_vmx_succeed or nested_vmx_fail here. At this point * we are no longer running L1, and VMLAUNCH/VMRESUME has not yet * returned as far as L1 is concerned. It will only return (and set * the success flag) when L2 exits (see nested_vmx_vmexit()). */ return 1; } /* * On a nested exit from L2 to L1, vmcs12.guest_cr0 might not be up-to-date * because L2 may have changed some cr0 bits directly (CRO_GUEST_HOST_MASK). * This function returns the new value we should put in vmcs12.guest_cr0. * It's not enough to just return the vmcs02 GUEST_CR0. Rather, * 1. Bits that neither L0 nor L1 trapped, were set directly by L2 and are now * available in vmcs02 GUEST_CR0. (Note: It's enough to check that L0 * didn't trap the bit, because if L1 did, so would L0). * 2. Bits that L1 asked to trap (and therefore L0 also did) could not have * been modified by L2, and L1 knows it. So just leave the old value of * the bit from vmcs12.guest_cr0. Note that the bit from vmcs02 GUEST_CR0 * isn't relevant, because if L0 traps this bit it can set it to anything. * 3. Bits that L1 didn't trap, but L0 did. L1 believes the guest could have * changed these bits, and therefore they need to be updated, but L0 * didn't necessarily allow them to be changed in GUEST_CR0 - and rather * put them in vmcs02 CR0_READ_SHADOW. So take these bits from there. */ static inline unsigned long vmcs12_guest_cr0(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { return /*1*/ (vmcs_readl(GUEST_CR0) & vcpu->arch.cr0_guest_owned_bits) | /*2*/ (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask) | /*3*/ (vmcs_readl(CR0_READ_SHADOW) & ~(vmcs12->cr0_guest_host_mask | vcpu->arch.cr0_guest_owned_bits)); } static inline unsigned long vmcs12_guest_cr4(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { return /*1*/ (vmcs_readl(GUEST_CR4) & vcpu->arch.cr4_guest_owned_bits) | /*2*/ (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask) | /*3*/ (vmcs_readl(CR4_READ_SHADOW) & ~(vmcs12->cr4_guest_host_mask | vcpu->arch.cr4_guest_owned_bits)); } /* * prepare_vmcs12 is part of what we need to do when the nested L2 guest exits * and we want to prepare to run its L1 parent. L1 keeps a vmcs for L2 (vmcs12), * and this function updates it to reflect the changes to the guest state while * L2 was running (and perhaps made some exits which were handled directly by L0 * without going back to L1), and to reflect the exit reason. * Note that we do not have to copy here all VMCS fields, just those that * could have changed by the L2 guest or the exit - i.e., the guest-state and * exit-information fields only. Other fields are modified by L1 with VMWRITE, * which already writes to vmcs12 directly. */ void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { /* update guest state fields: */ vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12); vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12); kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7); vmcs12->guest_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP); vmcs12->guest_rip = kvm_register_read(vcpu, VCPU_REGS_RIP); vmcs12->guest_rflags = vmcs_readl(GUEST_RFLAGS); vmcs12->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR); vmcs12->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR); vmcs12->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR); vmcs12->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR); vmcs12->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR); vmcs12->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR); vmcs12->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR); vmcs12->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR); vmcs12->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT); vmcs12->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT); vmcs12->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT); vmcs12->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT); vmcs12->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT); vmcs12->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT); vmcs12->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT); vmcs12->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT); vmcs12->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT); vmcs12->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT); vmcs12->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES); vmcs12->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES); vmcs12->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES); vmcs12->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES); vmcs12->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES); vmcs12->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES); vmcs12->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES); vmcs12->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES); vmcs12->guest_es_base = vmcs_readl(GUEST_ES_BASE); vmcs12->guest_cs_base = vmcs_readl(GUEST_CS_BASE); vmcs12->guest_ss_base = vmcs_readl(GUEST_SS_BASE); vmcs12->guest_ds_base = vmcs_readl(GUEST_DS_BASE); vmcs12->guest_fs_base = vmcs_readl(GUEST_FS_BASE); vmcs12->guest_gs_base = vmcs_readl(GUEST_GS_BASE); vmcs12->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE); vmcs12->guest_tr_base = vmcs_readl(GUEST_TR_BASE); vmcs12->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE); vmcs12->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE); vmcs12->guest_activity_state = vmcs_read32(GUEST_ACTIVITY_STATE); vmcs12->guest_interruptibility_info = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); vmcs12->guest_pending_dbg_exceptions = vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS); /* TODO: These cannot have changed unless we have MSR bitmaps and * the relevant bit asks not to trap the change */ vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL); if (vmcs12->vm_entry_controls & VM_EXIT_SAVE_IA32_PAT) vmcs12->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT); vmcs12->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS); vmcs12->guest_sysenter_esp = vmcs_readl(GUEST_SYSENTER_ESP); vmcs12->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP); /* update exit information fields: */ vmcs12->vm_exit_reason = vmcs_read32(VM_EXIT_REASON); vmcs12->exit_qualification = vmcs_readl(EXIT_QUALIFICATION); vmcs12->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); vmcs12->vm_exit_intr_error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE); vmcs12->idt_vectoring_info_field = vmcs_read32(IDT_VECTORING_INFO_FIELD); vmcs12->idt_vectoring_error_code = vmcs_read32(IDT_VECTORING_ERROR_CODE); vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); /* clear vm-entry fields which are to be cleared on exit */ if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK; } /* * A part of what we need to when the nested L2 guest exits and we want to * run its L1 parent, is to reset L1's guest state to the host state specified * in vmcs12. * This function is to be called not only on normal nested exit, but also on * a nested entry failure, as explained in Intel's spec, 3B.23.7 ("VM-Entry * Failures During or After Loading Guest State"). * This function should be called when the active VMCS is L1's (vmcs01). */ void load_vmcs12_host_state(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) vcpu->arch.efer = vmcs12->host_ia32_efer; if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE) vcpu->arch.efer |= (EFER_LMA | EFER_LME); else vcpu->arch.efer &= ~(EFER_LMA | EFER_LME); vmx_set_efer(vcpu, vcpu->arch.efer); kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->host_rsp); kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->host_rip); /* * Note that calling vmx_set_cr0 is important, even if cr0 hasn't * actually changed, because it depends on the current state of * fpu_active (which may have changed). * Note that vmx_set_cr0 refers to efer set above. */ kvm_set_cr0(vcpu, vmcs12->host_cr0); /* * If we did fpu_activate()/fpu_deactivate() during L2's run, we need * to apply the same changes to L1's vmcs. We just set cr0 correctly, * but we also need to update cr0_guest_host_mask and exception_bitmap. */ update_exception_bitmap(vcpu); vcpu->arch.cr0_guest_owned_bits = (vcpu->fpu_active ? X86_CR0_TS : 0); vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); /* * Note that CR4_GUEST_HOST_MASK is already set in the original vmcs01 * (KVM doesn't change it)- no reason to call set_cr4_guest_host_mask(); */ vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK); kvm_set_cr4(vcpu, vmcs12->host_cr4); /* shadow page tables on either EPT or shadow page tables */ kvm_set_cr3(vcpu, vmcs12->host_cr3); kvm_mmu_reset_context(vcpu); if (enable_vpid) { /* * Trivially support vpid by letting L2s share their parent * L1's vpid. TODO: move to a more elaborate solution, giving * each L2 its own vpid and exposing the vpid feature to L1. */ vmx_flush_tlb(vcpu); } vmcs_write32(GUEST_SYSENTER_CS, vmcs12->host_ia32_sysenter_cs); vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->host_ia32_sysenter_esp); vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->host_ia32_sysenter_eip); vmcs_writel(GUEST_IDTR_BASE, vmcs12->host_idtr_base); vmcs_writel(GUEST_GDTR_BASE, vmcs12->host_gdtr_base); vmcs_writel(GUEST_TR_BASE, vmcs12->host_tr_base); vmcs_writel(GUEST_GS_BASE, vmcs12->host_gs_base); vmcs_writel(GUEST_FS_BASE, vmcs12->host_fs_base); vmcs_write16(GUEST_ES_SELECTOR, vmcs12->host_es_selector); vmcs_write16(GUEST_CS_SELECTOR, vmcs12->host_cs_selector); vmcs_write16(GUEST_SS_SELECTOR, vmcs12->host_ss_selector); vmcs_write16(GUEST_DS_SELECTOR, vmcs12->host_ds_selector); vmcs_write16(GUEST_FS_SELECTOR, vmcs12->host_fs_selector); vmcs_write16(GUEST_GS_SELECTOR, vmcs12->host_gs_selector); vmcs_write16(GUEST_TR_SELECTOR, vmcs12->host_tr_selector); if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT) vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat); if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL, vmcs12->host_ia32_perf_global_ctrl); } /* * Emulate an exit from nested guest (L2) to L1, i.e., prepare to run L1 * and modify vmcs12 to make it see what it would expect to see there if * L2 was its real guest. Must only be called when in L2 (is_guest_mode()) */ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); int cpu; struct vmcs12 *vmcs12 = get_vmcs12(vcpu); leave_guest_mode(vcpu); prepare_vmcs12(vcpu, vmcs12); cpu = get_cpu(); vmx->loaded_vmcs = &vmx->vmcs01; vmx_vcpu_put(vcpu); vmx_vcpu_load(vcpu, cpu); vcpu->cpu = cpu; put_cpu(); /* if no vmcs02 cache requested, remove the one we used */ if (VMCS02_POOL_SIZE == 0) nested_free_vmcs02(vmx, vmx->nested.current_vmptr); load_vmcs12_host_state(vcpu, vmcs12); /* Update TSC_OFFSET if TSC was changed while L2 ran */ vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset); /* This is needed for same reason as it was needed in prepare_vmcs02 */ vmx->host_rsp = 0; /* Unpin physical memory we referred to in vmcs02 */ if (vmx->nested.apic_access_page) { nested_release_page(vmx->nested.apic_access_page); vmx->nested.apic_access_page = 0; } /* * Exiting from L2 to L1, we're now back to L1 which thinks it just * finished a VMLAUNCH or VMRESUME instruction, so we need to set the * success or failure flag accordingly. */ if (unlikely(vmx->fail)) { vmx->fail = 0; nested_vmx_failValid(vcpu, vmcs_read32(VM_INSTRUCTION_ERROR)); } else nested_vmx_succeed(vcpu); } /* * L1's failure to enter L2 is a subset of a normal exit, as explained in * 23.7 "VM-entry failures during or after loading guest state" (this also * lists the acceptable exit-reason and exit-qualification parameters). * It should only be called before L2 actually succeeded to run, and when * vmcs01 is current (it doesn't leave_guest_mode() or switch vmcss). */ static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, u32 reason, unsigned long qualification) { load_vmcs12_host_state(vcpu, vmcs12); vmcs12->vm_exit_reason = reason | VMX_EXIT_REASONS_FAILED_VMENTRY; vmcs12->exit_qualification = qualification; nested_vmx_succeed(vcpu); } static int vmx_check_intercept(struct kvm_vcpu *vcpu, struct x86_instruction_info *info, enum x86_intercept_stage stage) { return X86EMUL_CONTINUE; } static struct kvm_x86_ops vmx_x86_ops = { .cpu_has_kvm_support = cpu_has_kvm_support, .disabled_by_bios = vmx_disabled_by_bios, .hardware_setup = hardware_setup, .hardware_unsetup = hardware_unsetup, .check_processor_compatibility = vmx_check_processor_compat, .hardware_enable = hardware_enable, .hardware_disable = hardware_disable, .cpu_has_accelerated_tpr = report_flexpriority, .vcpu_create = vmx_create_vcpu, .vcpu_free = vmx_free_vcpu, .vcpu_reset = vmx_vcpu_reset, .prepare_guest_switch = vmx_save_host_state, .vcpu_load = vmx_vcpu_load, .vcpu_put = vmx_vcpu_put, .set_guest_debug = set_guest_debug, .get_msr = vmx_get_msr, .set_msr = vmx_set_msr, .get_segment_base = vmx_get_segment_base, .get_segment = vmx_get_segment, .set_segment = vmx_set_segment, .get_cpl = vmx_get_cpl, .get_cs_db_l_bits = vmx_get_cs_db_l_bits, .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits, .decache_cr3 = vmx_decache_cr3, .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits, .set_cr0 = vmx_set_cr0, .set_cr3 = vmx_set_cr3, .set_cr4 = vmx_set_cr4, .set_efer = vmx_set_efer, .get_idt = vmx_get_idt, .set_idt = vmx_set_idt, .get_gdt = vmx_get_gdt, .set_gdt = vmx_set_gdt, .set_dr7 = vmx_set_dr7, .cache_reg = vmx_cache_reg, .get_rflags = vmx_get_rflags, .set_rflags = vmx_set_rflags, .fpu_activate = vmx_fpu_activate, .fpu_deactivate = vmx_fpu_deactivate, .tlb_flush = vmx_flush_tlb, .run = vmx_vcpu_run, .handle_exit = vmx_handle_exit, .skip_emulated_instruction = skip_emulated_instruction, .set_interrupt_shadow = vmx_set_interrupt_shadow, .get_interrupt_shadow = vmx_get_interrupt_shadow, .patch_hypercall = vmx_patch_hypercall, .set_irq = vmx_inject_irq, .set_nmi = vmx_inject_nmi, .queue_exception = vmx_queue_exception, .cancel_injection = vmx_cancel_injection, .interrupt_allowed = vmx_interrupt_allowed, .nmi_allowed = vmx_nmi_allowed, .get_nmi_mask = vmx_get_nmi_mask, .set_nmi_mask = vmx_set_nmi_mask, .enable_nmi_window = enable_nmi_window, .enable_irq_window = enable_irq_window, .update_cr8_intercept = update_cr8_intercept, .set_tss_addr = vmx_set_tss_addr, .get_tdp_level = get_ept_level, .get_mt_mask = vmx_get_mt_mask, .get_exit_info = vmx_get_exit_info, .get_lpage_level = vmx_get_lpage_level, .cpuid_update = vmx_cpuid_update, .rdtscp_supported = vmx_rdtscp_supported, .set_supported_cpuid = vmx_set_supported_cpuid, .has_wbinvd_exit = cpu_has_vmx_wbinvd_exit, .set_tsc_khz = vmx_set_tsc_khz, .write_tsc_offset = vmx_write_tsc_offset, .adjust_tsc_offset = vmx_adjust_tsc_offset, .compute_tsc_offset = vmx_compute_tsc_offset, .read_l1_tsc = vmx_read_l1_tsc, .set_tdp_cr3 = vmx_set_cr3, .check_intercept = vmx_check_intercept, }; static int __init vmx_init(void) { int r, i; rdmsrl_safe(MSR_EFER, &host_efer); for (i = 0; i < NR_VMX_MSR; ++i) kvm_define_shared_msr(i, vmx_msr_index[i]); vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL); if (!vmx_io_bitmap_a) return -ENOMEM; vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL); if (!vmx_io_bitmap_b) { r = -ENOMEM; goto out; } vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL); if (!vmx_msr_bitmap_legacy) { r = -ENOMEM; goto out1; } vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL); if (!vmx_msr_bitmap_longmode) { r = -ENOMEM; goto out2; } /* * Allow direct access to the PC debug port (it is often used for I/O * delays, but the vmexits simply slow things down). */ memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE); clear_bit(0x80, vmx_io_bitmap_a); memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE); memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE); memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE); set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */ r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), __alignof__(struct vcpu_vmx), THIS_MODULE); if (r) goto out3; vmx_disable_intercept_for_msr(MSR_FS_BASE, false); vmx_disable_intercept_for_msr(MSR_GS_BASE, false); vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true); vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false); vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false); vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false); if (enable_ept) { kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull, VMX_EPT_EXECUTABLE_MASK); ept_set_mmio_spte_mask(); kvm_enable_tdp(); } else kvm_disable_tdp(); return 0; out3: free_page((unsigned long)vmx_msr_bitmap_longmode); out2: free_page((unsigned long)vmx_msr_bitmap_legacy); out1: free_page((unsigned long)vmx_io_bitmap_b); out: free_page((unsigned long)vmx_io_bitmap_a); return r; } static void __exit vmx_exit(void) { free_page((unsigned long)vmx_msr_bitmap_legacy); free_page((unsigned long)vmx_msr_bitmap_longmode); free_page((unsigned long)vmx_io_bitmap_b); free_page((unsigned long)vmx_io_bitmap_a); kvm_exit(); } module_init(vmx_init) module_exit(vmx_exit)