/* * Kernel-based Virtual Machine driver for Linux * * derived from drivers/kvm/kvm_main.c * * Copyright (C) 2006 Qumranet, Inc. * * 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 "kvm.h" #include "x86.h" #include "x86_emulate.h" #include "segment_descriptor.h" #include "irq.h" #include #include #include #include #include #include #define MAX_IO_MSRS 256 #define CR0_RESERVED_BITS \ (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \ | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \ | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG)) #define CR4_RESERVED_BITS \ (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\ | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \ | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \ | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE)) #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR) #define EFER_RESERVED_BITS 0xfffffffffffff2fe #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU struct kvm_x86_ops *kvm_x86_ops; struct kvm_stats_debugfs_item debugfs_entries[] = { { "pf_fixed", VCPU_STAT(pf_fixed) }, { "pf_guest", VCPU_STAT(pf_guest) }, { "tlb_flush", VCPU_STAT(tlb_flush) }, { "invlpg", VCPU_STAT(invlpg) }, { "exits", VCPU_STAT(exits) }, { "io_exits", VCPU_STAT(io_exits) }, { "mmio_exits", VCPU_STAT(mmio_exits) }, { "signal_exits", VCPU_STAT(signal_exits) }, { "irq_window", VCPU_STAT(irq_window_exits) }, { "halt_exits", VCPU_STAT(halt_exits) }, { "halt_wakeup", VCPU_STAT(halt_wakeup) }, { "request_irq", VCPU_STAT(request_irq_exits) }, { "irq_exits", VCPU_STAT(irq_exits) }, { "host_state_reload", VCPU_STAT(host_state_reload) }, { "efer_reload", VCPU_STAT(efer_reload) }, { "fpu_reload", VCPU_STAT(fpu_reload) }, { "insn_emulation", VCPU_STAT(insn_emulation) }, { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) }, { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, { "mmu_pte_write", VM_STAT(mmu_pte_write) }, { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) }, { "mmu_flooded", VM_STAT(mmu_flooded) }, { "mmu_recycled", VM_STAT(mmu_recycled) }, { NULL } }; unsigned long segment_base(u16 selector) { struct descriptor_table gdt; struct segment_descriptor *d; unsigned long table_base; unsigned long v; if (selector == 0) return 0; asm("sgdt %0" : "=m"(gdt)); table_base = gdt.base; if (selector & 4) { /* from ldt */ u16 ldt_selector; asm("sldt %0" : "=g"(ldt_selector)); table_base = segment_base(ldt_selector); } d = (struct segment_descriptor *)(table_base + (selector & ~7)); v = d->base_low | ((unsigned long)d->base_mid << 16) | ((unsigned long)d->base_high << 24); #ifdef CONFIG_X86_64 if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11)) v |= ((unsigned long) \ ((struct segment_descriptor_64 *)d)->base_higher) << 32; #endif return v; } EXPORT_SYMBOL_GPL(segment_base); u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) { if (irqchip_in_kernel(vcpu->kvm)) return vcpu->apic_base; else return vcpu->apic_base; } EXPORT_SYMBOL_GPL(kvm_get_apic_base); void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data) { /* TODO: reserve bits check */ if (irqchip_in_kernel(vcpu->kvm)) kvm_lapic_set_base(vcpu, data); else vcpu->apic_base = data; } EXPORT_SYMBOL_GPL(kvm_set_apic_base); static void inject_gp(struct kvm_vcpu *vcpu) { kvm_x86_ops->inject_gp(vcpu, 0); } /* * Load the pae pdptrs. Return true is they are all valid. */ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) { gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; int i; int ret; u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)]; mutex_lock(&vcpu->kvm->lock); ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte, offset * sizeof(u64), sizeof(pdpte)); if (ret < 0) { ret = 0; goto out; } for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) { ret = 0; goto out; } } ret = 1; memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs)); out: mutex_unlock(&vcpu->kvm->lock); return ret; } void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) { if (cr0 & CR0_RESERVED_BITS) { printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n", cr0, vcpu->cr0); inject_gp(vcpu); return; } if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) { printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n"); inject_gp(vcpu); return; } if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) { printk(KERN_DEBUG "set_cr0: #GP, set PG flag " "and a clear PE flag\n"); inject_gp(vcpu); return; } if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { #ifdef CONFIG_X86_64 if ((vcpu->shadow_efer & EFER_LME)) { int cs_db, cs_l; if (!is_pae(vcpu)) { printk(KERN_DEBUG "set_cr0: #GP, start paging " "in long mode while PAE is disabled\n"); inject_gp(vcpu); return; } kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); if (cs_l) { printk(KERN_DEBUG "set_cr0: #GP, start paging " "in long mode while CS.L == 1\n"); inject_gp(vcpu); return; } } else #endif if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) { printk(KERN_DEBUG "set_cr0: #GP, pdptrs " "reserved bits\n"); inject_gp(vcpu); return; } } kvm_x86_ops->set_cr0(vcpu, cr0); vcpu->cr0 = cr0; mutex_lock(&vcpu->kvm->lock); kvm_mmu_reset_context(vcpu); mutex_unlock(&vcpu->kvm->lock); return; } EXPORT_SYMBOL_GPL(set_cr0); void lmsw(struct kvm_vcpu *vcpu, unsigned long msw) { set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f)); } EXPORT_SYMBOL_GPL(lmsw); void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) { if (cr4 & CR4_RESERVED_BITS) { printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n"); inject_gp(vcpu); return; } if (is_long_mode(vcpu)) { if (!(cr4 & X86_CR4_PAE)) { printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while " "in long mode\n"); inject_gp(vcpu); return; } } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE) && !load_pdptrs(vcpu, vcpu->cr3)) { printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n"); inject_gp(vcpu); return; } if (cr4 & X86_CR4_VMXE) { printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n"); inject_gp(vcpu); return; } kvm_x86_ops->set_cr4(vcpu, cr4); vcpu->cr4 = cr4; mutex_lock(&vcpu->kvm->lock); kvm_mmu_reset_context(vcpu); mutex_unlock(&vcpu->kvm->lock); } EXPORT_SYMBOL_GPL(set_cr4); void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) { if (is_long_mode(vcpu)) { if (cr3 & CR3_L_MODE_RESERVED_BITS) { printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n"); inject_gp(vcpu); return; } } else { if (is_pae(vcpu)) { if (cr3 & CR3_PAE_RESERVED_BITS) { printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n"); inject_gp(vcpu); return; } if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) { printk(KERN_DEBUG "set_cr3: #GP, pdptrs " "reserved bits\n"); inject_gp(vcpu); return; } } /* * We don't check reserved bits in nonpae mode, because * this isn't enforced, and VMware depends on this. */ } mutex_lock(&vcpu->kvm->lock); /* * Does the new cr3 value map to physical memory? (Note, we * catch an invalid cr3 even in real-mode, because it would * cause trouble later on when we turn on paging anyway.) * * A real CPU would silently accept an invalid cr3 and would * attempt to use it - with largely undefined (and often hard * to debug) behavior on the guest side. */ if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT))) inject_gp(vcpu); else { vcpu->cr3 = cr3; vcpu->mmu.new_cr3(vcpu); } mutex_unlock(&vcpu->kvm->lock); } EXPORT_SYMBOL_GPL(set_cr3); void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) { if (cr8 & CR8_RESERVED_BITS) { printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8); inject_gp(vcpu); return; } if (irqchip_in_kernel(vcpu->kvm)) kvm_lapic_set_tpr(vcpu, cr8); else vcpu->cr8 = cr8; } EXPORT_SYMBOL_GPL(set_cr8); unsigned long get_cr8(struct kvm_vcpu *vcpu) { if (irqchip_in_kernel(vcpu->kvm)) return kvm_lapic_get_cr8(vcpu); else return vcpu->cr8; } EXPORT_SYMBOL_GPL(get_cr8); /* * List of msr numbers which we expose to userspace through KVM_GET_MSRS * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. * * This list is modified at module load time to reflect the * capabilities of the host cpu. */ static u32 msrs_to_save[] = { MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, MSR_K6_STAR, #ifdef CONFIG_X86_64 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, #endif MSR_IA32_TIME_STAMP_COUNTER, }; static unsigned num_msrs_to_save; static u32 emulated_msrs[] = { MSR_IA32_MISC_ENABLE, }; #ifdef CONFIG_X86_64 static void set_efer(struct kvm_vcpu *vcpu, u64 efer) { if (efer & EFER_RESERVED_BITS) { printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n", efer); inject_gp(vcpu); return; } if (is_paging(vcpu) && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) { printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n"); inject_gp(vcpu); return; } kvm_x86_ops->set_efer(vcpu, efer); efer &= ~EFER_LMA; efer |= vcpu->shadow_efer & EFER_LMA; vcpu->shadow_efer = efer; } #endif /* * Writes msr value into into the appropriate "register". * Returns 0 on success, non-0 otherwise. * Assumes vcpu_load() was already called. */ int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) { return kvm_x86_ops->set_msr(vcpu, msr_index, data); } /* * Adapt set_msr() to msr_io()'s calling convention */ static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) { return kvm_set_msr(vcpu, index, *data); } int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) { switch (msr) { #ifdef CONFIG_X86_64 case MSR_EFER: set_efer(vcpu, data); break; #endif case MSR_IA32_MC0_STATUS: pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n", __FUNCTION__, data); break; case MSR_IA32_MCG_STATUS: pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n", __FUNCTION__, data); break; case MSR_IA32_UCODE_REV: case MSR_IA32_UCODE_WRITE: case 0x200 ... 0x2ff: /* MTRRs */ break; case MSR_IA32_APICBASE: kvm_set_apic_base(vcpu, data); break; case MSR_IA32_MISC_ENABLE: vcpu->ia32_misc_enable_msr = data; break; default: pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr); return 1; } return 0; } EXPORT_SYMBOL_GPL(kvm_set_msr_common); /* * Reads an msr value (of 'msr_index') into 'pdata'. * Returns 0 on success, non-0 otherwise. * Assumes vcpu_load() was already called. */ int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) { return kvm_x86_ops->get_msr(vcpu, msr_index, pdata); } int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) { u64 data; switch (msr) { case 0xc0010010: /* SYSCFG */ case 0xc0010015: /* HWCR */ case MSR_IA32_PLATFORM_ID: case MSR_IA32_P5_MC_ADDR: case MSR_IA32_P5_MC_TYPE: case MSR_IA32_MC0_CTL: case MSR_IA32_MCG_STATUS: case MSR_IA32_MCG_CAP: case MSR_IA32_MC0_MISC: case MSR_IA32_MC0_MISC+4: case MSR_IA32_MC0_MISC+8: case MSR_IA32_MC0_MISC+12: case MSR_IA32_MC0_MISC+16: case MSR_IA32_UCODE_REV: case MSR_IA32_PERF_STATUS: case MSR_IA32_EBL_CR_POWERON: /* MTRR registers */ case 0xfe: case 0x200 ... 0x2ff: data = 0; break; case 0xcd: /* fsb frequency */ data = 3; break; case MSR_IA32_APICBASE: data = kvm_get_apic_base(vcpu); break; case MSR_IA32_MISC_ENABLE: data = vcpu->ia32_misc_enable_msr; break; #ifdef CONFIG_X86_64 case MSR_EFER: data = vcpu->shadow_efer; break; #endif default: pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr); return 1; } *pdata = data; return 0; } EXPORT_SYMBOL_GPL(kvm_get_msr_common); /* * Read or write a bunch of msrs. All parameters are kernel addresses. * * @return number of msrs set successfully. */ static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, struct kvm_msr_entry *entries, int (*do_msr)(struct kvm_vcpu *vcpu, unsigned index, u64 *data)) { int i; vcpu_load(vcpu); for (i = 0; i < msrs->nmsrs; ++i) if (do_msr(vcpu, entries[i].index, &entries[i].data)) break; vcpu_put(vcpu); return i; } /* * Read or write a bunch of msrs. Parameters are user addresses. * * @return number of msrs set successfully. */ static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, int (*do_msr)(struct kvm_vcpu *vcpu, unsigned index, u64 *data), int writeback) { struct kvm_msrs msrs; struct kvm_msr_entry *entries; int r, n; unsigned size; r = -EFAULT; if (copy_from_user(&msrs, user_msrs, sizeof msrs)) goto out; r = -E2BIG; if (msrs.nmsrs >= MAX_IO_MSRS) goto out; r = -ENOMEM; size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; entries = vmalloc(size); if (!entries) goto out; r = -EFAULT; if (copy_from_user(entries, user_msrs->entries, size)) goto out_free; r = n = __msr_io(vcpu, &msrs, entries, do_msr); if (r < 0) goto out_free; r = -EFAULT; if (writeback && copy_to_user(user_msrs->entries, entries, size)) goto out_free; r = n; out_free: vfree(entries); out: return r; } /* * Make sure that a cpu that is being hot-unplugged does not have any vcpus * cached on it. */ void decache_vcpus_on_cpu(int cpu) { struct kvm *vm; struct kvm_vcpu *vcpu; int i; spin_lock(&kvm_lock); list_for_each_entry(vm, &vm_list, vm_list) for (i = 0; i < KVM_MAX_VCPUS; ++i) { vcpu = vm->vcpus[i]; if (!vcpu) continue; /* * If the vcpu is locked, then it is running on some * other cpu and therefore it is not cached on the * cpu in question. * * If it's not locked, check the last cpu it executed * on. */ if (mutex_trylock(&vcpu->mutex)) { if (vcpu->cpu == cpu) { kvm_x86_ops->vcpu_decache(vcpu); vcpu->cpu = -1; } mutex_unlock(&vcpu->mutex); } } spin_unlock(&kvm_lock); } int kvm_dev_ioctl_check_extension(long ext) { int r; switch (ext) { case KVM_CAP_IRQCHIP: case KVM_CAP_HLT: case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: case KVM_CAP_USER_MEMORY: case KVM_CAP_SET_TSS_ADDR: r = 1; break; default: r = 0; break; } return r; } long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { void __user *argp = (void __user *)arg; long r; switch (ioctl) { case KVM_GET_MSR_INDEX_LIST: { struct kvm_msr_list __user *user_msr_list = argp; struct kvm_msr_list msr_list; unsigned n; r = -EFAULT; if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) goto out; n = msr_list.nmsrs; msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs); if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) goto out; r = -E2BIG; if (n < num_msrs_to_save) goto out; r = -EFAULT; if (copy_to_user(user_msr_list->indices, &msrs_to_save, num_msrs_to_save * sizeof(u32))) goto out; if (copy_to_user(user_msr_list->indices + num_msrs_to_save * sizeof(u32), &emulated_msrs, ARRAY_SIZE(emulated_msrs) * sizeof(u32))) goto out; r = 0; break; } default: r = -EINVAL; } out: return r; } void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { kvm_x86_ops->vcpu_load(vcpu, cpu); } void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { kvm_x86_ops->vcpu_put(vcpu); kvm_put_guest_fpu(vcpu); } static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) { u64 efer; int i; struct kvm_cpuid_entry *e, *entry; rdmsrl(MSR_EFER, efer); entry = NULL; for (i = 0; i < vcpu->cpuid_nent; ++i) { e = &vcpu->cpuid_entries[i]; if (e->function == 0x80000001) { entry = e; break; } } if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) { entry->edx &= ~(1 << 20); printk(KERN_INFO "kvm: guest NX capability removed\n"); } } static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid *cpuid, struct kvm_cpuid_entry __user *entries) { int r; r = -E2BIG; if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) goto out; r = -EFAULT; if (copy_from_user(&vcpu->cpuid_entries, entries, cpuid->nent * sizeof(struct kvm_cpuid_entry))) goto out; vcpu->cpuid_nent = cpuid->nent; cpuid_fix_nx_cap(vcpu); return 0; out: return r; } static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) { vcpu_load(vcpu); memcpy(s->regs, vcpu->apic->regs, sizeof *s); vcpu_put(vcpu); return 0; } static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) { vcpu_load(vcpu); memcpy(vcpu->apic->regs, s->regs, sizeof *s); kvm_apic_post_state_restore(vcpu); vcpu_put(vcpu); return 0; } long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; int r; switch (ioctl) { case KVM_GET_LAPIC: { struct kvm_lapic_state lapic; memset(&lapic, 0, sizeof lapic); r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &lapic, sizeof lapic)) goto out; r = 0; break; } case KVM_SET_LAPIC: { struct kvm_lapic_state lapic; r = -EFAULT; if (copy_from_user(&lapic, argp, sizeof lapic)) goto out; r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);; if (r) goto out; r = 0; break; } case KVM_SET_CPUID: { struct kvm_cpuid __user *cpuid_arg = argp; struct kvm_cpuid cpuid; r = -EFAULT; if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) goto out; r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); if (r) goto out; break; } case KVM_GET_MSRS: r = msr_io(vcpu, argp, kvm_get_msr, 1); break; case KVM_SET_MSRS: r = msr_io(vcpu, argp, do_set_msr, 0); break; default: r = -EINVAL; } out: return r; } static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) { int ret; if (addr > (unsigned int)(-3 * PAGE_SIZE)) return -1; ret = kvm_x86_ops->set_tss_addr(kvm, addr); return ret; } static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, u32 kvm_nr_mmu_pages) { if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) return -EINVAL; mutex_lock(&kvm->lock); kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); kvm->n_requested_mmu_pages = kvm_nr_mmu_pages; mutex_unlock(&kvm->lock); return 0; } static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) { return kvm->n_alloc_mmu_pages; } /* * Set a new alias region. Aliases map a portion of physical memory into * another portion. This is useful for memory windows, for example the PC * VGA region. */ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm, struct kvm_memory_alias *alias) { int r, n; struct kvm_mem_alias *p; r = -EINVAL; /* General sanity checks */ if (alias->memory_size & (PAGE_SIZE - 1)) goto out; if (alias->guest_phys_addr & (PAGE_SIZE - 1)) goto out; if (alias->slot >= KVM_ALIAS_SLOTS) goto out; if (alias->guest_phys_addr + alias->memory_size < alias->guest_phys_addr) goto out; if (alias->target_phys_addr + alias->memory_size < alias->target_phys_addr) goto out; mutex_lock(&kvm->lock); p = &kvm->aliases[alias->slot]; p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT; p->npages = alias->memory_size >> PAGE_SHIFT; p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT; for (n = KVM_ALIAS_SLOTS; n > 0; --n) if (kvm->aliases[n - 1].npages) break; kvm->naliases = n; kvm_mmu_zap_all(kvm); mutex_unlock(&kvm->lock); return 0; out: return r; } static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) { int r; r = 0; switch (chip->chip_id) { case KVM_IRQCHIP_PIC_MASTER: memcpy(&chip->chip.pic, &pic_irqchip(kvm)->pics[0], sizeof(struct kvm_pic_state)); break; case KVM_IRQCHIP_PIC_SLAVE: memcpy(&chip->chip.pic, &pic_irqchip(kvm)->pics[1], sizeof(struct kvm_pic_state)); break; case KVM_IRQCHIP_IOAPIC: memcpy(&chip->chip.ioapic, ioapic_irqchip(kvm), sizeof(struct kvm_ioapic_state)); break; default: r = -EINVAL; break; } return r; } static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) { int r; r = 0; switch (chip->chip_id) { case KVM_IRQCHIP_PIC_MASTER: memcpy(&pic_irqchip(kvm)->pics[0], &chip->chip.pic, sizeof(struct kvm_pic_state)); break; case KVM_IRQCHIP_PIC_SLAVE: memcpy(&pic_irqchip(kvm)->pics[1], &chip->chip.pic, sizeof(struct kvm_pic_state)); break; case KVM_IRQCHIP_IOAPIC: memcpy(ioapic_irqchip(kvm), &chip->chip.ioapic, sizeof(struct kvm_ioapic_state)); break; default: r = -EINVAL; break; } kvm_pic_update_irq(pic_irqchip(kvm)); return r; } /* * Get (and clear) the dirty memory log for a memory slot. */ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) { int r; int n; struct kvm_memory_slot *memslot; int is_dirty = 0; mutex_lock(&kvm->lock); r = kvm_get_dirty_log(kvm, log, &is_dirty); if (r) goto out; /* If nothing is dirty, don't bother messing with page tables. */ if (is_dirty) { kvm_mmu_slot_remove_write_access(kvm, log->slot); kvm_flush_remote_tlbs(kvm); memslot = &kvm->memslots[log->slot]; n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; memset(memslot->dirty_bitmap, 0, n); } r = 0; out: mutex_unlock(&kvm->lock); return r; } long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct kvm *kvm = filp->private_data; void __user *argp = (void __user *)arg; int r = -EINVAL; switch (ioctl) { case KVM_SET_TSS_ADDR: r = kvm_vm_ioctl_set_tss_addr(kvm, arg); if (r < 0) goto out; break; case KVM_SET_MEMORY_REGION: { struct kvm_memory_region kvm_mem; struct kvm_userspace_memory_region kvm_userspace_mem; r = -EFAULT; if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem)) goto out; kvm_userspace_mem.slot = kvm_mem.slot; kvm_userspace_mem.flags = kvm_mem.flags; kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr; kvm_userspace_mem.memory_size = kvm_mem.memory_size; r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0); if (r) goto out; break; } case KVM_SET_NR_MMU_PAGES: r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); if (r) goto out; break; case KVM_GET_NR_MMU_PAGES: r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); break; case KVM_SET_MEMORY_ALIAS: { struct kvm_memory_alias alias; r = -EFAULT; if (copy_from_user(&alias, argp, sizeof alias)) goto out; r = kvm_vm_ioctl_set_memory_alias(kvm, &alias); if (r) goto out; break; } case KVM_CREATE_IRQCHIP: r = -ENOMEM; kvm->vpic = kvm_create_pic(kvm); if (kvm->vpic) { r = kvm_ioapic_init(kvm); if (r) { kfree(kvm->vpic); kvm->vpic = NULL; goto out; } } else goto out; break; case KVM_IRQ_LINE: { struct kvm_irq_level irq_event; r = -EFAULT; if (copy_from_user(&irq_event, argp, sizeof irq_event)) goto out; if (irqchip_in_kernel(kvm)) { mutex_lock(&kvm->lock); if (irq_event.irq < 16) kvm_pic_set_irq(pic_irqchip(kvm), irq_event.irq, irq_event.level); kvm_ioapic_set_irq(kvm->vioapic, irq_event.irq, irq_event.level); mutex_unlock(&kvm->lock); r = 0; } break; } case KVM_GET_IRQCHIP: { /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ struct kvm_irqchip chip; r = -EFAULT; if (copy_from_user(&chip, argp, sizeof chip)) goto out; r = -ENXIO; if (!irqchip_in_kernel(kvm)) goto out; r = kvm_vm_ioctl_get_irqchip(kvm, &chip); if (r) goto out; r = -EFAULT; if (copy_to_user(argp, &chip, sizeof chip)) goto out; r = 0; break; } case KVM_SET_IRQCHIP: { /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ struct kvm_irqchip chip; r = -EFAULT; if (copy_from_user(&chip, argp, sizeof chip)) goto out; r = -ENXIO; if (!irqchip_in_kernel(kvm)) goto out; r = kvm_vm_ioctl_set_irqchip(kvm, &chip); if (r) goto out; r = 0; break; } default: ; } out: return r; } static void kvm_init_msr_list(void) { u32 dummy[2]; unsigned i, j; for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) { if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) continue; if (j < i) msrs_to_save[j] = msrs_to_save[i]; j++; } num_msrs_to_save = j; } /* * Only apic need an MMIO device hook, so shortcut now.. */ static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu, gpa_t addr) { struct kvm_io_device *dev; if (vcpu->apic) { dev = &vcpu->apic->dev; if (dev->in_range(dev, addr)) return dev; } return NULL; } static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu, gpa_t addr) { struct kvm_io_device *dev; dev = vcpu_find_pervcpu_dev(vcpu, addr); if (dev == NULL) dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr); return dev; } int emulator_read_std(unsigned long addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu) { void *data = val; while (bytes) { gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); unsigned offset = addr & (PAGE_SIZE-1); unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset); int ret; if (gpa == UNMAPPED_GVA) return X86EMUL_PROPAGATE_FAULT; ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy); if (ret < 0) return X86EMUL_UNHANDLEABLE; bytes -= tocopy; data += tocopy; addr += tocopy; } return X86EMUL_CONTINUE; } EXPORT_SYMBOL_GPL(emulator_read_std); static int emulator_write_std(unsigned long addr, const void *val, unsigned int bytes, struct kvm_vcpu *vcpu) { pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes); return X86EMUL_UNHANDLEABLE; } static int emulator_read_emulated(unsigned long addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu) { struct kvm_io_device *mmio_dev; gpa_t gpa; if (vcpu->mmio_read_completed) { memcpy(val, vcpu->mmio_data, bytes); vcpu->mmio_read_completed = 0; return X86EMUL_CONTINUE; } gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); /* For APIC access vmexit */ if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) goto mmio; if (emulator_read_std(addr, val, bytes, vcpu) == X86EMUL_CONTINUE) return X86EMUL_CONTINUE; if (gpa == UNMAPPED_GVA) return X86EMUL_PROPAGATE_FAULT; mmio: /* * Is this MMIO handled locally? */ mmio_dev = vcpu_find_mmio_dev(vcpu, gpa); if (mmio_dev) { kvm_iodevice_read(mmio_dev, gpa, bytes, val); return X86EMUL_CONTINUE; } vcpu->mmio_needed = 1; vcpu->mmio_phys_addr = gpa; vcpu->mmio_size = bytes; vcpu->mmio_is_write = 0; return X86EMUL_UNHANDLEABLE; } static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, const void *val, int bytes) { int ret; ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes); if (ret < 0) return 0; kvm_mmu_pte_write(vcpu, gpa, val, bytes); return 1; } static int emulator_write_emulated_onepage(unsigned long addr, const void *val, unsigned int bytes, struct kvm_vcpu *vcpu) { struct kvm_io_device *mmio_dev; gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr); if (gpa == UNMAPPED_GVA) { kvm_x86_ops->inject_page_fault(vcpu, addr, 2); return X86EMUL_PROPAGATE_FAULT; } /* For APIC access vmexit */ if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) goto mmio; if (emulator_write_phys(vcpu, gpa, val, bytes)) return X86EMUL_CONTINUE; mmio: /* * Is this MMIO handled locally? */ mmio_dev = vcpu_find_mmio_dev(vcpu, gpa); if (mmio_dev) { kvm_iodevice_write(mmio_dev, gpa, bytes, val); return X86EMUL_CONTINUE; } vcpu->mmio_needed = 1; vcpu->mmio_phys_addr = gpa; vcpu->mmio_size = bytes; vcpu->mmio_is_write = 1; memcpy(vcpu->mmio_data, val, bytes); return X86EMUL_CONTINUE; } int emulator_write_emulated(unsigned long addr, const void *val, unsigned int bytes, struct kvm_vcpu *vcpu) { /* Crossing a page boundary? */ if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { int rc, now; now = -addr & ~PAGE_MASK; rc = emulator_write_emulated_onepage(addr, val, now, vcpu); if (rc != X86EMUL_CONTINUE) return rc; addr += now; val += now; bytes -= now; } return emulator_write_emulated_onepage(addr, val, bytes, vcpu); } EXPORT_SYMBOL_GPL(emulator_write_emulated); static int emulator_cmpxchg_emulated(unsigned long addr, const void *old, const void *new, unsigned int bytes, struct kvm_vcpu *vcpu) { static int reported; if (!reported) { reported = 1; printk(KERN_WARNING "kvm: emulating exchange as write\n"); } return emulator_write_emulated(addr, new, bytes, vcpu); } static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) { return kvm_x86_ops->get_segment_base(vcpu, seg); } int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address) { return X86EMUL_CONTINUE; } int emulate_clts(struct kvm_vcpu *vcpu) { kvm_x86_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS); return X86EMUL_CONTINUE; } int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest) { struct kvm_vcpu *vcpu = ctxt->vcpu; switch (dr) { case 0 ... 3: *dest = kvm_x86_ops->get_dr(vcpu, dr); return X86EMUL_CONTINUE; default: pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr); return X86EMUL_UNHANDLEABLE; } } int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value) { unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U; int exception; kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception); if (exception) { /* FIXME: better handling */ return X86EMUL_UNHANDLEABLE; } return X86EMUL_CONTINUE; } void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context) { static int reported; u8 opcodes[4]; unsigned long rip = vcpu->rip; unsigned long rip_linear; rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS); if (reported) return; emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu); printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n", context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]); reported = 1; } EXPORT_SYMBOL_GPL(kvm_report_emulation_failure); struct x86_emulate_ops emulate_ops = { .read_std = emulator_read_std, .write_std = emulator_write_std, .read_emulated = emulator_read_emulated, .write_emulated = emulator_write_emulated, .cmpxchg_emulated = emulator_cmpxchg_emulated, }; int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run, unsigned long cr2, u16 error_code, int no_decode) { int r; vcpu->mmio_fault_cr2 = cr2; kvm_x86_ops->cache_regs(vcpu); vcpu->mmio_is_write = 0; vcpu->pio.string = 0; if (!no_decode) { int cs_db, cs_l; kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); vcpu->emulate_ctxt.vcpu = vcpu; vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu); vcpu->emulate_ctxt.cr2 = cr2; vcpu->emulate_ctxt.mode = (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_REAL : cs_l ? X86EMUL_MODE_PROT64 : cs_db ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) { vcpu->emulate_ctxt.cs_base = 0; vcpu->emulate_ctxt.ds_base = 0; vcpu->emulate_ctxt.es_base = 0; vcpu->emulate_ctxt.ss_base = 0; } else { vcpu->emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS); vcpu->emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS); vcpu->emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES); vcpu->emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS); } vcpu->emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS); vcpu->emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS); r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops); ++vcpu->stat.insn_emulation; if (r) { ++vcpu->stat.insn_emulation_fail; if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) return EMULATE_DONE; return EMULATE_FAIL; } } r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops); if (vcpu->pio.string) return EMULATE_DO_MMIO; if ((r || vcpu->mmio_is_write) && run) { run->exit_reason = KVM_EXIT_MMIO; run->mmio.phys_addr = vcpu->mmio_phys_addr; memcpy(run->mmio.data, vcpu->mmio_data, 8); run->mmio.len = vcpu->mmio_size; run->mmio.is_write = vcpu->mmio_is_write; } if (r) { if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) return EMULATE_DONE; if (!vcpu->mmio_needed) { kvm_report_emulation_failure(vcpu, "mmio"); return EMULATE_FAIL; } return EMULATE_DO_MMIO; } kvm_x86_ops->decache_regs(vcpu); kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags); if (vcpu->mmio_is_write) { vcpu->mmio_needed = 0; return EMULATE_DO_MMIO; } return EMULATE_DONE; } EXPORT_SYMBOL_GPL(emulate_instruction); static void free_pio_guest_pages(struct kvm_vcpu *vcpu) { int i; for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i) if (vcpu->pio.guest_pages[i]) { kvm_release_page(vcpu->pio.guest_pages[i]); vcpu->pio.guest_pages[i] = NULL; } } static int pio_copy_data(struct kvm_vcpu *vcpu) { void *p = vcpu->pio_data; void *q; unsigned bytes; int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1; q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE, PAGE_KERNEL); if (!q) { free_pio_guest_pages(vcpu); return -ENOMEM; } q += vcpu->pio.guest_page_offset; bytes = vcpu->pio.size * vcpu->pio.cur_count; if (vcpu->pio.in) memcpy(q, p, bytes); else memcpy(p, q, bytes); q -= vcpu->pio.guest_page_offset; vunmap(q); free_pio_guest_pages(vcpu); return 0; } int complete_pio(struct kvm_vcpu *vcpu) { struct kvm_pio_request *io = &vcpu->pio; long delta; int r; kvm_x86_ops->cache_regs(vcpu); if (!io->string) { if (io->in) memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data, io->size); } else { if (io->in) { r = pio_copy_data(vcpu); if (r) { kvm_x86_ops->cache_regs(vcpu); return r; } } delta = 1; if (io->rep) { delta *= io->cur_count; /* * The size of the register should really depend on * current address size. */ vcpu->regs[VCPU_REGS_RCX] -= delta; } if (io->down) delta = -delta; delta *= io->size; if (io->in) vcpu->regs[VCPU_REGS_RDI] += delta; else vcpu->regs[VCPU_REGS_RSI] += delta; } kvm_x86_ops->decache_regs(vcpu); io->count -= io->cur_count; io->cur_count = 0; return 0; } static void kernel_pio(struct kvm_io_device *pio_dev, struct kvm_vcpu *vcpu, void *pd) { /* TODO: String I/O for in kernel device */ mutex_lock(&vcpu->kvm->lock); if (vcpu->pio.in) kvm_iodevice_read(pio_dev, vcpu->pio.port, vcpu->pio.size, pd); else kvm_iodevice_write(pio_dev, vcpu->pio.port, vcpu->pio.size, pd); mutex_unlock(&vcpu->kvm->lock); } static void pio_string_write(struct kvm_io_device *pio_dev, struct kvm_vcpu *vcpu) { struct kvm_pio_request *io = &vcpu->pio; void *pd = vcpu->pio_data; int i; mutex_lock(&vcpu->kvm->lock); for (i = 0; i < io->cur_count; i++) { kvm_iodevice_write(pio_dev, io->port, io->size, pd); pd += io->size; } mutex_unlock(&vcpu->kvm->lock); } static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu, gpa_t addr) { return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr); } int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, int size, unsigned port) { struct kvm_io_device *pio_dev; vcpu->run->exit_reason = KVM_EXIT_IO; vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; vcpu->run->io.size = vcpu->pio.size = size; vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1; vcpu->run->io.port = vcpu->pio.port = port; vcpu->pio.in = in; vcpu->pio.string = 0; vcpu->pio.down = 0; vcpu->pio.guest_page_offset = 0; vcpu->pio.rep = 0; kvm_x86_ops->cache_regs(vcpu); memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4); kvm_x86_ops->decache_regs(vcpu); kvm_x86_ops->skip_emulated_instruction(vcpu); pio_dev = vcpu_find_pio_dev(vcpu, port); if (pio_dev) { kernel_pio(pio_dev, vcpu, vcpu->pio_data); complete_pio(vcpu); return 1; } return 0; } EXPORT_SYMBOL_GPL(kvm_emulate_pio); int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, int size, unsigned long count, int down, gva_t address, int rep, unsigned port) { unsigned now, in_page; int i, ret = 0; int nr_pages = 1; struct page *page; struct kvm_io_device *pio_dev; vcpu->run->exit_reason = KVM_EXIT_IO; vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; vcpu->run->io.size = vcpu->pio.size = size; vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count; vcpu->run->io.port = vcpu->pio.port = port; vcpu->pio.in = in; vcpu->pio.string = 1; vcpu->pio.down = down; vcpu->pio.guest_page_offset = offset_in_page(address); vcpu->pio.rep = rep; if (!count) { kvm_x86_ops->skip_emulated_instruction(vcpu); return 1; } if (!down) in_page = PAGE_SIZE - offset_in_page(address); else in_page = offset_in_page(address) + size; now = min(count, (unsigned long)in_page / size); if (!now) { /* * String I/O straddles page boundary. Pin two guest pages * so that we satisfy atomicity constraints. Do just one * transaction to avoid complexity. */ nr_pages = 2; now = 1; } if (down) { /* * String I/O in reverse. Yuck. Kill the guest, fix later. */ pr_unimpl(vcpu, "guest string pio down\n"); inject_gp(vcpu); return 1; } vcpu->run->io.count = now; vcpu->pio.cur_count = now; if (vcpu->pio.cur_count == vcpu->pio.count) kvm_x86_ops->skip_emulated_instruction(vcpu); for (i = 0; i < nr_pages; ++i) { mutex_lock(&vcpu->kvm->lock); page = gva_to_page(vcpu, address + i * PAGE_SIZE); vcpu->pio.guest_pages[i] = page; mutex_unlock(&vcpu->kvm->lock); if (!page) { inject_gp(vcpu); free_pio_guest_pages(vcpu); return 1; } } pio_dev = vcpu_find_pio_dev(vcpu, port); if (!vcpu->pio.in) { /* string PIO write */ ret = pio_copy_data(vcpu); if (ret >= 0 && pio_dev) { pio_string_write(pio_dev, vcpu); complete_pio(vcpu); if (vcpu->pio.count == 0) ret = 1; } } else if (pio_dev) pr_unimpl(vcpu, "no string pio read support yet, " "port %x size %d count %ld\n", port, size, count); return ret; } EXPORT_SYMBOL_GPL(kvm_emulate_pio_string); int kvm_arch_init(void *opaque) { int r; struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque; r = kvm_mmu_module_init(); if (r) goto out_fail; kvm_init_msr_list(); if (kvm_x86_ops) { printk(KERN_ERR "kvm: already loaded the other module\n"); r = -EEXIST; goto out; } if (!ops->cpu_has_kvm_support()) { printk(KERN_ERR "kvm: no hardware support\n"); r = -EOPNOTSUPP; goto out; } if (ops->disabled_by_bios()) { printk(KERN_ERR "kvm: disabled by bios\n"); r = -EOPNOTSUPP; goto out; } kvm_x86_ops = ops; kvm_mmu_set_nonpresent_ptes(0ull, 0ull); return 0; out: kvm_mmu_module_exit(); out_fail: return r; } void kvm_arch_exit(void) { kvm_x86_ops = NULL; kvm_mmu_module_exit(); } int kvm_emulate_halt(struct kvm_vcpu *vcpu) { ++vcpu->stat.halt_exits; if (irqchip_in_kernel(vcpu->kvm)) { vcpu->mp_state = VCPU_MP_STATE_HALTED; kvm_vcpu_block(vcpu); if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE) return -EINTR; return 1; } else { vcpu->run->exit_reason = KVM_EXIT_HLT; return 0; } } EXPORT_SYMBOL_GPL(kvm_emulate_halt); int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) { unsigned long nr, a0, a1, a2, a3, ret; kvm_x86_ops->cache_regs(vcpu); nr = vcpu->regs[VCPU_REGS_RAX]; a0 = vcpu->regs[VCPU_REGS_RBX]; a1 = vcpu->regs[VCPU_REGS_RCX]; a2 = vcpu->regs[VCPU_REGS_RDX]; a3 = vcpu->regs[VCPU_REGS_RSI]; if (!is_long_mode(vcpu)) { nr &= 0xFFFFFFFF; a0 &= 0xFFFFFFFF; a1 &= 0xFFFFFFFF; a2 &= 0xFFFFFFFF; a3 &= 0xFFFFFFFF; } switch (nr) { default: ret = -KVM_ENOSYS; break; } vcpu->regs[VCPU_REGS_RAX] = ret; kvm_x86_ops->decache_regs(vcpu); return 0; } EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); int kvm_fix_hypercall(struct kvm_vcpu *vcpu) { char instruction[3]; int ret = 0; mutex_lock(&vcpu->kvm->lock); /* * Blow out the MMU to ensure that no other VCPU has an active mapping * to ensure that the updated hypercall appears atomically across all * VCPUs. */ kvm_mmu_zap_all(vcpu->kvm); kvm_x86_ops->cache_regs(vcpu); kvm_x86_ops->patch_hypercall(vcpu, instruction); if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu) != X86EMUL_CONTINUE) ret = -EFAULT; mutex_unlock(&vcpu->kvm->lock); return ret; } static u64 mk_cr_64(u64 curr_cr, u32 new_val) { return (curr_cr & ~((1ULL << 32) - 1)) | new_val; } void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) { struct descriptor_table dt = { limit, base }; kvm_x86_ops->set_gdt(vcpu, &dt); } void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) { struct descriptor_table dt = { limit, base }; kvm_x86_ops->set_idt(vcpu, &dt); } void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, unsigned long *rflags) { lmsw(vcpu, msw); *rflags = kvm_x86_ops->get_rflags(vcpu); } unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) { kvm_x86_ops->decache_cr4_guest_bits(vcpu); switch (cr) { case 0: return vcpu->cr0; case 2: return vcpu->cr2; case 3: return vcpu->cr3; case 4: return vcpu->cr4; default: vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); return 0; } } void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, unsigned long *rflags) { switch (cr) { case 0: set_cr0(vcpu, mk_cr_64(vcpu->cr0, val)); *rflags = kvm_x86_ops->get_rflags(vcpu); break; case 2: vcpu->cr2 = val; break; case 3: set_cr3(vcpu, val); break; case 4: set_cr4(vcpu, mk_cr_64(vcpu->cr4, val)); break; default: vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); } } void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) { int i; u32 function; struct kvm_cpuid_entry *e, *best; kvm_x86_ops->cache_regs(vcpu); function = vcpu->regs[VCPU_REGS_RAX]; vcpu->regs[VCPU_REGS_RAX] = 0; vcpu->regs[VCPU_REGS_RBX] = 0; vcpu->regs[VCPU_REGS_RCX] = 0; vcpu->regs[VCPU_REGS_RDX] = 0; best = NULL; for (i = 0; i < vcpu->cpuid_nent; ++i) { e = &vcpu->cpuid_entries[i]; if (e->function == function) { best = e; break; } /* * Both basic or both extended? */ if (((e->function ^ function) & 0x80000000) == 0) if (!best || e->function > best->function) best = e; } if (best) { vcpu->regs[VCPU_REGS_RAX] = best->eax; vcpu->regs[VCPU_REGS_RBX] = best->ebx; vcpu->regs[VCPU_REGS_RCX] = best->ecx; vcpu->regs[VCPU_REGS_RDX] = best->edx; } kvm_x86_ops->decache_regs(vcpu); kvm_x86_ops->skip_emulated_instruction(vcpu); } EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); /* * Check if userspace requested an interrupt window, and that the * interrupt window is open. * * No need to exit to userspace if we already have an interrupt queued. */ static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { return (!vcpu->irq_summary && kvm_run->request_interrupt_window && vcpu->interrupt_window_open && (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF)); } static void post_kvm_run_save(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0; kvm_run->cr8 = get_cr8(vcpu); kvm_run->apic_base = kvm_get_apic_base(vcpu); if (irqchip_in_kernel(vcpu->kvm)) kvm_run->ready_for_interrupt_injection = 1; else kvm_run->ready_for_interrupt_injection = (vcpu->interrupt_window_open && vcpu->irq_summary == 0); } static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { int r; if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) { pr_debug("vcpu %d received sipi with vector # %x\n", vcpu->vcpu_id, vcpu->sipi_vector); kvm_lapic_reset(vcpu); r = kvm_x86_ops->vcpu_reset(vcpu); if (r) return r; vcpu->mp_state = VCPU_MP_STATE_RUNNABLE; } preempted: if (vcpu->guest_debug.enabled) kvm_x86_ops->guest_debug_pre(vcpu); again: r = kvm_mmu_reload(vcpu); if (unlikely(r)) goto out; kvm_inject_pending_timer_irqs(vcpu); preempt_disable(); kvm_x86_ops->prepare_guest_switch(vcpu); kvm_load_guest_fpu(vcpu); local_irq_disable(); if (signal_pending(current)) { local_irq_enable(); preempt_enable(); r = -EINTR; kvm_run->exit_reason = KVM_EXIT_INTR; ++vcpu->stat.signal_exits; goto out; } if (irqchip_in_kernel(vcpu->kvm)) kvm_x86_ops->inject_pending_irq(vcpu); else if (!vcpu->mmio_read_completed) kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run); vcpu->guest_mode = 1; kvm_guest_enter(); if (vcpu->requests) if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests)) kvm_x86_ops->tlb_flush(vcpu); kvm_x86_ops->run(vcpu, kvm_run); vcpu->guest_mode = 0; local_irq_enable(); ++vcpu->stat.exits; /* * We must have an instruction between local_irq_enable() and * kvm_guest_exit(), so the timer interrupt isn't delayed by * the interrupt shadow. The stat.exits increment will do nicely. * But we need to prevent reordering, hence this barrier(): */ barrier(); kvm_guest_exit(); preempt_enable(); /* * Profile KVM exit RIPs: */ if (unlikely(prof_on == KVM_PROFILING)) { kvm_x86_ops->cache_regs(vcpu); profile_hit(KVM_PROFILING, (void *)vcpu->rip); } r = kvm_x86_ops->handle_exit(kvm_run, vcpu); if (r > 0) { if (dm_request_for_irq_injection(vcpu, kvm_run)) { r = -EINTR; kvm_run->exit_reason = KVM_EXIT_INTR; ++vcpu->stat.request_irq_exits; goto out; } if (!need_resched()) goto again; } out: if (r > 0) { kvm_resched(vcpu); goto preempted; } post_kvm_run_save(vcpu, kvm_run); return r; } int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { int r; sigset_t sigsaved; vcpu_load(vcpu); if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) { kvm_vcpu_block(vcpu); vcpu_put(vcpu); return -EAGAIN; } if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); /* re-sync apic's tpr */ if (!irqchip_in_kernel(vcpu->kvm)) set_cr8(vcpu, kvm_run->cr8); if (vcpu->pio.cur_count) { r = complete_pio(vcpu); if (r) goto out; } #if CONFIG_HAS_IOMEM if (vcpu->mmio_needed) { memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8); vcpu->mmio_read_completed = 1; vcpu->mmio_needed = 0; r = emulate_instruction(vcpu, kvm_run, vcpu->mmio_fault_cr2, 0, 1); if (r == EMULATE_DO_MMIO) { /* * Read-modify-write. Back to userspace. */ r = 0; goto out; } } #endif if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) { kvm_x86_ops->cache_regs(vcpu); vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret; kvm_x86_ops->decache_regs(vcpu); } r = __vcpu_run(vcpu, kvm_run); out: if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &sigsaved, NULL); vcpu_put(vcpu); return r; } int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { vcpu_load(vcpu); kvm_x86_ops->cache_regs(vcpu); regs->rax = vcpu->regs[VCPU_REGS_RAX]; regs->rbx = vcpu->regs[VCPU_REGS_RBX]; regs->rcx = vcpu->regs[VCPU_REGS_RCX]; regs->rdx = vcpu->regs[VCPU_REGS_RDX]; regs->rsi = vcpu->regs[VCPU_REGS_RSI]; regs->rdi = vcpu->regs[VCPU_REGS_RDI]; regs->rsp = vcpu->regs[VCPU_REGS_RSP]; regs->rbp = vcpu->regs[VCPU_REGS_RBP]; #ifdef CONFIG_X86_64 regs->r8 = vcpu->regs[VCPU_REGS_R8]; regs->r9 = vcpu->regs[VCPU_REGS_R9]; regs->r10 = vcpu->regs[VCPU_REGS_R10]; regs->r11 = vcpu->regs[VCPU_REGS_R11]; regs->r12 = vcpu->regs[VCPU_REGS_R12]; regs->r13 = vcpu->regs[VCPU_REGS_R13]; regs->r14 = vcpu->regs[VCPU_REGS_R14]; regs->r15 = vcpu->regs[VCPU_REGS_R15]; #endif regs->rip = vcpu->rip; regs->rflags = kvm_x86_ops->get_rflags(vcpu); /* * Don't leak debug flags in case they were set for guest debugging */ if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep) regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF); vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { vcpu_load(vcpu); vcpu->regs[VCPU_REGS_RAX] = regs->rax; vcpu->regs[VCPU_REGS_RBX] = regs->rbx; vcpu->regs[VCPU_REGS_RCX] = regs->rcx; vcpu->regs[VCPU_REGS_RDX] = regs->rdx; vcpu->regs[VCPU_REGS_RSI] = regs->rsi; vcpu->regs[VCPU_REGS_RDI] = regs->rdi; vcpu->regs[VCPU_REGS_RSP] = regs->rsp; vcpu->regs[VCPU_REGS_RBP] = regs->rbp; #ifdef CONFIG_X86_64 vcpu->regs[VCPU_REGS_R8] = regs->r8; vcpu->regs[VCPU_REGS_R9] = regs->r9; vcpu->regs[VCPU_REGS_R10] = regs->r10; vcpu->regs[VCPU_REGS_R11] = regs->r11; vcpu->regs[VCPU_REGS_R12] = regs->r12; vcpu->regs[VCPU_REGS_R13] = regs->r13; vcpu->regs[VCPU_REGS_R14] = regs->r14; vcpu->regs[VCPU_REGS_R15] = regs->r15; #endif vcpu->rip = regs->rip; kvm_x86_ops->set_rflags(vcpu, regs->rflags); kvm_x86_ops->decache_regs(vcpu); vcpu_put(vcpu); return 0; } static void get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { return kvm_x86_ops->get_segment(vcpu, var, seg); } void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) { struct kvm_segment cs; get_segment(vcpu, &cs, VCPU_SREG_CS); *db = cs.db; *l = cs.l; } EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) { struct descriptor_table dt; int pending_vec; vcpu_load(vcpu); get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); get_segment(vcpu, &sregs->es, VCPU_SREG_ES); get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); kvm_x86_ops->get_idt(vcpu, &dt); sregs->idt.limit = dt.limit; sregs->idt.base = dt.base; kvm_x86_ops->get_gdt(vcpu, &dt); sregs->gdt.limit = dt.limit; sregs->gdt.base = dt.base; kvm_x86_ops->decache_cr4_guest_bits(vcpu); sregs->cr0 = vcpu->cr0; sregs->cr2 = vcpu->cr2; sregs->cr3 = vcpu->cr3; sregs->cr4 = vcpu->cr4; sregs->cr8 = get_cr8(vcpu); sregs->efer = vcpu->shadow_efer; sregs->apic_base = kvm_get_apic_base(vcpu); if (irqchip_in_kernel(vcpu->kvm)) { memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap); pending_vec = kvm_x86_ops->get_irq(vcpu); if (pending_vec >= 0) set_bit(pending_vec, (unsigned long *)sregs->interrupt_bitmap); } else memcpy(sregs->interrupt_bitmap, vcpu->irq_pending, sizeof sregs->interrupt_bitmap); vcpu_put(vcpu); return 0; } static void set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { return kvm_x86_ops->set_segment(vcpu, var, seg); } int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) { int mmu_reset_needed = 0; int i, pending_vec, max_bits; struct descriptor_table dt; vcpu_load(vcpu); dt.limit = sregs->idt.limit; dt.base = sregs->idt.base; kvm_x86_ops->set_idt(vcpu, &dt); dt.limit = sregs->gdt.limit; dt.base = sregs->gdt.base; kvm_x86_ops->set_gdt(vcpu, &dt); vcpu->cr2 = sregs->cr2; mmu_reset_needed |= vcpu->cr3 != sregs->cr3; vcpu->cr3 = sregs->cr3; set_cr8(vcpu, sregs->cr8); mmu_reset_needed |= vcpu->shadow_efer != sregs->efer; #ifdef CONFIG_X86_64 kvm_x86_ops->set_efer(vcpu, sregs->efer); #endif kvm_set_apic_base(vcpu, sregs->apic_base); kvm_x86_ops->decache_cr4_guest_bits(vcpu); mmu_reset_needed |= vcpu->cr0 != sregs->cr0; vcpu->cr0 = sregs->cr0; kvm_x86_ops->set_cr0(vcpu, sregs->cr0); mmu_reset_needed |= vcpu->cr4 != sregs->cr4; kvm_x86_ops->set_cr4(vcpu, sregs->cr4); if (!is_long_mode(vcpu) && is_pae(vcpu)) load_pdptrs(vcpu, vcpu->cr3); if (mmu_reset_needed) kvm_mmu_reset_context(vcpu); if (!irqchip_in_kernel(vcpu->kvm)) { memcpy(vcpu->irq_pending, sregs->interrupt_bitmap, sizeof vcpu->irq_pending); vcpu->irq_summary = 0; for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i) if (vcpu->irq_pending[i]) __set_bit(i, &vcpu->irq_summary); } else { max_bits = (sizeof sregs->interrupt_bitmap) << 3; pending_vec = find_first_bit( (const unsigned long *)sregs->interrupt_bitmap, max_bits); /* Only pending external irq is handled here */ if (pending_vec < max_bits) { kvm_x86_ops->set_irq(vcpu, pending_vec); pr_debug("Set back pending irq %d\n", pending_vec); } } set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); set_segment(vcpu, &sregs->es, VCPU_SREG_ES); set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg) { int r; vcpu_load(vcpu); r = kvm_x86_ops->set_guest_debug(vcpu, dbg); vcpu_put(vcpu); return r; } /* * fxsave fpu state. Taken from x86_64/processor.h. To be killed when * we have asm/x86/processor.h */ struct fxsave { u16 cwd; u16 swd; u16 twd; u16 fop; u64 rip; u64 rdp; u32 mxcsr; u32 mxcsr_mask; u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ #ifdef CONFIG_X86_64 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ #else u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */ #endif }; /* * Translate a guest virtual address to a guest physical address. */ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr) { unsigned long vaddr = tr->linear_address; gpa_t gpa; vcpu_load(vcpu); mutex_lock(&vcpu->kvm->lock); gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr); tr->physical_address = gpa; tr->valid = gpa != UNMAPPED_GVA; tr->writeable = 1; tr->usermode = 0; mutex_unlock(&vcpu->kvm->lock); vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; vcpu_load(vcpu); memcpy(fpu->fpr, fxsave->st_space, 128); fpu->fcw = fxsave->cwd; fpu->fsw = fxsave->swd; fpu->ftwx = fxsave->twd; fpu->last_opcode = fxsave->fop; fpu->last_ip = fxsave->rip; fpu->last_dp = fxsave->rdp; memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); vcpu_put(vcpu); return 0; } int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; vcpu_load(vcpu); memcpy(fxsave->st_space, fpu->fpr, 128); fxsave->cwd = fpu->fcw; fxsave->swd = fpu->fsw; fxsave->twd = fpu->ftwx; fxsave->fop = fpu->last_opcode; fxsave->rip = fpu->last_ip; fxsave->rdp = fpu->last_dp; memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); vcpu_put(vcpu); return 0; } void fx_init(struct kvm_vcpu *vcpu) { unsigned after_mxcsr_mask; /* Initialize guest FPU by resetting ours and saving into guest's */ preempt_disable(); fx_save(&vcpu->host_fx_image); fpu_init(); fx_save(&vcpu->guest_fx_image); fx_restore(&vcpu->host_fx_image); preempt_enable(); vcpu->cr0 |= X86_CR0_ET; after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space); vcpu->guest_fx_image.mxcsr = 0x1f80; memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask, 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask); } EXPORT_SYMBOL_GPL(fx_init); void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) { if (!vcpu->fpu_active || vcpu->guest_fpu_loaded) return; vcpu->guest_fpu_loaded = 1; fx_save(&vcpu->host_fx_image); fx_restore(&vcpu->guest_fx_image); } EXPORT_SYMBOL_GPL(kvm_load_guest_fpu); void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) { if (!vcpu->guest_fpu_loaded) return; vcpu->guest_fpu_loaded = 0; fx_save(&vcpu->guest_fx_image); fx_restore(&vcpu->host_fx_image); ++vcpu->stat.fpu_reload; } EXPORT_SYMBOL_GPL(kvm_put_guest_fpu); void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) { kvm_x86_ops->vcpu_free(vcpu); } struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) { int r; struct kvm_vcpu *vcpu = kvm_x86_ops->vcpu_create(kvm, id); if (IS_ERR(vcpu)) { r = -ENOMEM; goto fail; } /* We do fxsave: this must be aligned. */ BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF); vcpu_load(vcpu); r = kvm_arch_vcpu_reset(vcpu); if (r == 0) r = kvm_mmu_setup(vcpu); vcpu_put(vcpu); if (r < 0) goto free_vcpu; return vcpu; free_vcpu: kvm_x86_ops->vcpu_free(vcpu); fail: return ERR_PTR(r); } void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { vcpu_load(vcpu); kvm_mmu_unload(vcpu); vcpu_put(vcpu); kvm_x86_ops->vcpu_free(vcpu); } int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) { return kvm_x86_ops->vcpu_reset(vcpu); } void kvm_arch_hardware_enable(void *garbage) { kvm_x86_ops->hardware_enable(garbage); } void kvm_arch_hardware_disable(void *garbage) { kvm_x86_ops->hardware_disable(garbage); } int kvm_arch_hardware_setup(void) { return kvm_x86_ops->hardware_setup(); } void kvm_arch_hardware_unsetup(void) { kvm_x86_ops->hardware_unsetup(); } void kvm_arch_check_processor_compat(void *rtn) { kvm_x86_ops->check_processor_compatibility(rtn); } int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) { struct page *page; struct kvm *kvm; int r; BUG_ON(vcpu->kvm == NULL); kvm = vcpu->kvm; vcpu->mmu.root_hpa = INVALID_PAGE; if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0) vcpu->mp_state = VCPU_MP_STATE_RUNNABLE; else vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED; page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!page) { r = -ENOMEM; goto fail; } vcpu->pio_data = page_address(page); r = kvm_mmu_create(vcpu); if (r < 0) goto fail_free_pio_data; if (irqchip_in_kernel(kvm)) { r = kvm_create_lapic(vcpu); if (r < 0) goto fail_mmu_destroy; } return 0; fail_mmu_destroy: kvm_mmu_destroy(vcpu); fail_free_pio_data: free_page((unsigned long)vcpu->pio_data); fail: return r; } void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) { kvm_free_lapic(vcpu); kvm_mmu_destroy(vcpu); free_page((unsigned long)vcpu->pio_data); } struct kvm *kvm_arch_create_vm(void) { struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); if (!kvm) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&kvm->active_mmu_pages); return kvm; } static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) { vcpu_load(vcpu); kvm_mmu_unload(vcpu); vcpu_put(vcpu); } static void kvm_free_vcpus(struct kvm *kvm) { unsigned int i; /* * Unpin any mmu pages first. */ for (i = 0; i < KVM_MAX_VCPUS; ++i) if (kvm->vcpus[i]) kvm_unload_vcpu_mmu(kvm->vcpus[i]); for (i = 0; i < KVM_MAX_VCPUS; ++i) { if (kvm->vcpus[i]) { kvm_arch_vcpu_free(kvm->vcpus[i]); kvm->vcpus[i] = NULL; } } } void kvm_arch_destroy_vm(struct kvm *kvm) { kfree(kvm->vpic); kfree(kvm->vioapic); kvm_free_vcpus(kvm); kvm_free_physmem(kvm); kfree(kvm); }