kvm_host.h 33.2 KB
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#ifndef __KVM_HOST_H
#define __KVM_HOST_H
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/*
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 */

#include <linux/types.h>
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#include <linux/hardirq.h>
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#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
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#include <linux/signal.h>
#include <linux/sched.h>
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#include <linux/bug.h>
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#include <linux/mm.h>
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#include <linux/mmu_notifier.h>
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#include <linux/preempt.h>
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#include <linux/msi.h>
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#include <linux/slab.h>
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#include <linux/rcupdate.h>
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#include <linux/ratelimit.h>
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#include <linux/err.h>
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#include <linux/irqflags.h>
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#include <linux/context_tracking.h>
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#include <linux/irqbypass.h>
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#include <linux/swait.h>
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#include <asm/signal.h>
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#include <linux/kvm.h>
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#include <linux/kvm_para.h>
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#include <linux/kvm_types.h>
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#include <asm/kvm_host.h>
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/*
 * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used
 * in kvm, other bits are visible for userspace which are defined in
 * include/linux/kvm_h.
 */
#define KVM_MEMSLOT_INVALID	(1UL << 16)
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#define KVM_MEMSLOT_INCOHERENT	(1UL << 17)
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/* Two fragments for cross MMIO pages. */
#define KVM_MAX_MMIO_FRAGMENTS	2
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#ifndef KVM_ADDRESS_SPACE_NUM
#define KVM_ADDRESS_SPACE_NUM	1
#endif

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/*
 * For the normal pfn, the highest 12 bits should be zero,
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 * so we can mask bit 62 ~ bit 52  to indicate the error pfn,
 * mask bit 63 to indicate the noslot pfn.
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 */
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#define KVM_PFN_ERR_MASK	(0x7ffULL << 52)
#define KVM_PFN_ERR_NOSLOT_MASK	(0xfffULL << 52)
#define KVM_PFN_NOSLOT		(0x1ULL << 63)
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#define KVM_PFN_ERR_FAULT	(KVM_PFN_ERR_MASK)
#define KVM_PFN_ERR_HWPOISON	(KVM_PFN_ERR_MASK + 1)
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#define KVM_PFN_ERR_RO_FAULT	(KVM_PFN_ERR_MASK + 2)
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/*
 * error pfns indicate that the gfn is in slot but faild to
 * translate it to pfn on host.
 */
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static inline bool is_error_pfn(kvm_pfn_t pfn)
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{
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	return !!(pfn & KVM_PFN_ERR_MASK);
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}

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/*
 * error_noslot pfns indicate that the gfn can not be
 * translated to pfn - it is not in slot or failed to
 * translate it to pfn.
 */
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static inline bool is_error_noslot_pfn(kvm_pfn_t pfn)
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{
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	return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);
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}

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/* noslot pfn indicates that the gfn is not in slot. */
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static inline bool is_noslot_pfn(kvm_pfn_t pfn)
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{
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	return pfn == KVM_PFN_NOSLOT;
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}

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/*
 * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390)
 * provide own defines and kvm_is_error_hva
 */
#ifndef KVM_HVA_ERR_BAD

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#define KVM_HVA_ERR_BAD		(PAGE_OFFSET)
#define KVM_HVA_ERR_RO_BAD	(PAGE_OFFSET + PAGE_SIZE)
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static inline bool kvm_is_error_hva(unsigned long addr)
{
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	return addr >= PAGE_OFFSET;
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}

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#endif

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#define KVM_ERR_PTR_BAD_PAGE	(ERR_PTR(-ENOENT))

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static inline bool is_error_page(struct page *page)
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{
	return IS_ERR(page);
}

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/*
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 * Architecture-independent vcpu->requests bit members
 * Bits 4-7 are reserved for more arch-independent bits.
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 */
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#define KVM_REQ_TLB_FLUSH          0
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#define KVM_REQ_MMU_RELOAD         1
#define KVM_REQ_PENDING_TIMER      2
#define KVM_REQ_UNHALT             3
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#define KVM_USERSPACE_IRQ_SOURCE_ID		0
#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID	1
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extern struct kmem_cache *kvm_vcpu_cache;
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extern spinlock_t kvm_lock;
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extern struct list_head vm_list;

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struct kvm_io_range {
	gpa_t addr;
	int len;
	struct kvm_io_device *dev;
};

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#define NR_IOBUS_DEVS 1000
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struct kvm_io_bus {
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	int dev_count;
	int ioeventfd_count;
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	struct kvm_io_range range[];
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};

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enum kvm_bus {
	KVM_MMIO_BUS,
	KVM_PIO_BUS,
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	KVM_VIRTIO_CCW_NOTIFY_BUS,
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	KVM_FAST_MMIO_BUS,
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	KVM_NR_BUSES
};

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int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
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		     int len, const void *val);
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int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
			    gpa_t addr, int len, const void *val, long cookie);
int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
		    int len, void *val);
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int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
			    int len, struct kvm_io_device *dev);
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int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
			      struct kvm_io_device *dev);
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#ifdef CONFIG_KVM_ASYNC_PF
struct kvm_async_pf {
	struct work_struct work;
	struct list_head link;
	struct list_head queue;
	struct kvm_vcpu *vcpu;
	struct mm_struct *mm;
	gva_t gva;
	unsigned long addr;
	struct kvm_arch_async_pf arch;
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	bool   wakeup_all;
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};

void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
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int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
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		       struct kvm_arch_async_pf *arch);
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int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
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#endif

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enum {
	OUTSIDE_GUEST_MODE,
	IN_GUEST_MODE,
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	EXITING_GUEST_MODE,
	READING_SHADOW_PAGE_TABLES,
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};

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/*
 * Sometimes a large or cross-page mmio needs to be broken up into separate
 * exits for userspace servicing.
 */
struct kvm_mmio_fragment {
	gpa_t gpa;
	void *data;
	unsigned len;
};

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struct kvm_vcpu {
	struct kvm *kvm;
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#ifdef CONFIG_PREEMPT_NOTIFIERS
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	struct preempt_notifier preempt_notifier;
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#endif
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	int cpu;
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	int vcpu_id;
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	int srcu_idx;
	int mode;
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	unsigned long requests;
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	unsigned long guest_debug;
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	int pre_pcpu;
	struct list_head blocked_vcpu_list;

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	struct mutex mutex;
	struct kvm_run *run;
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	int fpu_active;
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	int guest_fpu_loaded, guest_xcr0_loaded;
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	unsigned char fpu_counter;
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	struct swait_queue_head wq;
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	struct pid *pid;
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	int sigset_active;
	sigset_t sigset;
	struct kvm_vcpu_stat stat;
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	unsigned int halt_poll_ns;
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#ifdef CONFIG_HAS_IOMEM
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	int mmio_needed;
	int mmio_read_completed;
	int mmio_is_write;
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	int mmio_cur_fragment;
	int mmio_nr_fragments;
	struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
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#endif
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#ifdef CONFIG_KVM_ASYNC_PF
	struct {
		u32 queued;
		struct list_head queue;
		struct list_head done;
		spinlock_t lock;
	} async_pf;
#endif

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#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
	/*
	 * Cpu relax intercept or pause loop exit optimization
	 * in_spin_loop: set when a vcpu does a pause loop exit
	 *  or cpu relax intercepted.
	 * dy_eligible: indicates whether vcpu is eligible for directed yield.
	 */
	struct {
		bool in_spin_loop;
		bool dy_eligible;
	} spin_loop;
#endif
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	bool preempted;
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	struct kvm_vcpu_arch arch;
};

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static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
{
	return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
}

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/*
 * Some of the bitops functions do not support too long bitmaps.
 * This number must be determined not to exceed such limits.
 */
#define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)

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struct kvm_memory_slot {
	gfn_t base_gfn;
	unsigned long npages;
	unsigned long *dirty_bitmap;
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	struct kvm_arch_memory_slot arch;
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	unsigned long userspace_addr;
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	u32 flags;
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	short id;
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};

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static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
{
	return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
}

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struct kvm_s390_adapter_int {
	u64 ind_addr;
	u64 summary_addr;
	u64 ind_offset;
	u32 summary_offset;
	u32 adapter_id;
};

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struct kvm_hv_sint {
	u32 vcpu;
	u32 sint;
};

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struct kvm_kernel_irq_routing_entry {
	u32 gsi;
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	u32 type;
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	int (*set)(struct kvm_kernel_irq_routing_entry *e,
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		   struct kvm *kvm, int irq_source_id, int level,
		   bool line_status);
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	union {
		struct {
			unsigned irqchip;
			unsigned pin;
		} irqchip;
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		struct msi_msg msi;
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		struct kvm_s390_adapter_int adapter;
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		struct kvm_hv_sint hv_sint;
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	};
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	struct hlist_node link;
};

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#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
struct kvm_irq_routing_table {
	int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
	u32 nr_rt_entries;
	/*
	 * Array indexed by gsi. Each entry contains list of irq chips
	 * the gsi is connected to.
	 */
	struct hlist_head map[0];
};
#endif

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#ifndef KVM_PRIVATE_MEM_SLOTS
#define KVM_PRIVATE_MEM_SLOTS 0
#endif

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#ifndef KVM_MEM_SLOTS_NUM
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#define KVM_MEM_SLOTS_NUM (KVM_USER_MEM_SLOTS + KVM_PRIVATE_MEM_SLOTS)
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#endif

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#ifndef __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu)
{
	return 0;
}
#endif

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/*
 * Note:
 * memslots are not sorted by id anymore, please use id_to_memslot()
 * to get the memslot by its id.
 */
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struct kvm_memslots {
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	u64 generation;
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	struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
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	/* The mapping table from slot id to the index in memslots[]. */
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	short id_to_index[KVM_MEM_SLOTS_NUM];
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	atomic_t lru_slot;
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	int used_slots;
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};

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struct kvm {
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	spinlock_t mmu_lock;
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	struct mutex slots_lock;
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	struct mm_struct *mm; /* userspace tied to this vm */
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	struct kvm_memslots *memslots[KVM_ADDRESS_SPACE_NUM];
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	struct srcu_struct srcu;
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	struct srcu_struct irq_srcu;
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	struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
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	atomic_t online_vcpus;
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	int last_boosted_vcpu;
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	struct list_head vm_list;
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	struct mutex lock;
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	struct kvm_io_bus *buses[KVM_NR_BUSES];
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#ifdef CONFIG_HAVE_KVM_EVENTFD
	struct {
		spinlock_t        lock;
		struct list_head  items;
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		struct list_head  resampler_list;
		struct mutex      resampler_lock;
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	} irqfds;
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	struct list_head ioeventfds;
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#endif
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	struct kvm_vm_stat stat;
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	struct kvm_arch arch;
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	atomic_t users_count;
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#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
	struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
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	spinlock_t ring_lock;
	struct list_head coalesced_zones;
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#endif
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	struct mutex irq_lock;
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#ifdef CONFIG_HAVE_KVM_IRQCHIP
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	/*
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	 * Update side is protected by irq_lock.
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	 */
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	struct kvm_irq_routing_table __rcu *irq_routing;
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#endif
#ifdef CONFIG_HAVE_KVM_IRQFD
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	struct hlist_head irq_ack_notifier_list;
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#endif

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#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
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	struct mmu_notifier mmu_notifier;
	unsigned long mmu_notifier_seq;
	long mmu_notifier_count;
#endif
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	long tlbs_dirty;
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	struct list_head devices;
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};

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#define kvm_err(fmt, ...) \
	pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
#define kvm_info(fmt, ...) \
	pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
#define kvm_debug(fmt, ...) \
	pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
#define kvm_pr_unimpl(fmt, ...) \
	pr_err_ratelimited("kvm [%i]: " fmt, \
			   task_tgid_nr(current), ## __VA_ARGS__)
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/* The guest did something we don't support. */
#define vcpu_unimpl(vcpu, fmt, ...)					\
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	kvm_pr_unimpl("vcpu%i, guest rIP: 0x%lx " fmt,			\
			(vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__)
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#define vcpu_debug(vcpu, fmt, ...)					\
	kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
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#define vcpu_err(vcpu, fmt, ...)					\
	kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
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static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
{
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	/* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu, in case
	 * the caller has read kvm->online_vcpus before (as is the case
	 * for kvm_for_each_vcpu, for example).
	 */
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	smp_rmb();
	return kvm->vcpus[i];
}

#define kvm_for_each_vcpu(idx, vcpup, kvm) \
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	for (idx = 0; \
	     idx < atomic_read(&kvm->online_vcpus) && \
	     (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
	     idx++)
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static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
{
	struct kvm_vcpu *vcpu;
	int i;

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	if (id < 0 || id >= KVM_MAX_VCPUS)
		return NULL;
	vcpu = kvm_get_vcpu(kvm, id);
	if (vcpu && vcpu->vcpu_id == id)
		return vcpu;
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	kvm_for_each_vcpu(i, vcpu, kvm)
		if (vcpu->vcpu_id == id)
			return vcpu;
	return NULL;
}

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#define kvm_for_each_memslot(memslot, slots)	\
	for (memslot = &slots->memslots[0];	\
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	      memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
		memslot++)
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int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);

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int __must_check vcpu_load(struct kvm_vcpu *vcpu);
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void vcpu_put(struct kvm_vcpu *vcpu);

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#ifdef __KVM_HAVE_IOAPIC
void kvm_vcpu_request_scan_ioapic(struct kvm *kvm);
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void kvm_arch_post_irq_routing_update(struct kvm *kvm);
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#else
static inline void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
{
}
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static inline void kvm_arch_post_irq_routing_update(struct kvm *kvm)
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{
}
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#endif

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#ifdef CONFIG_HAVE_KVM_IRQFD
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int kvm_irqfd_init(void);
void kvm_irqfd_exit(void);
#else
static inline int kvm_irqfd_init(void)
{
	return 0;
}

static inline void kvm_irqfd_exit(void)
{
}
#endif
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int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
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		  struct module *module);
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void kvm_exit(void);
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void kvm_get_kvm(struct kvm *kvm);
void kvm_put_kvm(struct kvm *kvm);

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static inline struct kvm_memslots *__kvm_memslots(struct kvm *kvm, int as_id)
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{
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	return rcu_dereference_check(kvm->memslots[as_id],
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			srcu_read_lock_held(&kvm->srcu)
			|| lockdep_is_held(&kvm->slots_lock));
}

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static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
{
	return __kvm_memslots(kvm, 0);
}

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static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu)
{
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	int as_id = kvm_arch_vcpu_memslots_id(vcpu);

	return __kvm_memslots(vcpu->kvm, as_id);
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}

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static inline struct kvm_memory_slot *
id_to_memslot(struct kvm_memslots *slots, int id)
{
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	int index = slots->id_to_index[id];
	struct kvm_memory_slot *slot;
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	slot = &slots->memslots[index];
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	WARN_ON(slot->id != id);
	return slot;
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}

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/*
 * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
 * - create a new memory slot
 * - delete an existing memory slot
 * - modify an existing memory slot
 *   -- move it in the guest physical memory space
 *   -- just change its flags
 *
 * Since flags can be changed by some of these operations, the following
 * differentiation is the best we can do for __kvm_set_memory_region():
 */
enum kvm_mr_change {
	KVM_MR_CREATE,
	KVM_MR_DELETE,
	KVM_MR_MOVE,
	KVM_MR_FLAGS_ONLY,
};

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int kvm_set_memory_region(struct kvm *kvm,
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			  const struct kvm_userspace_memory_region *mem);
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int __kvm_set_memory_region(struct kvm *kvm,
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			    const struct kvm_userspace_memory_region *mem);
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void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
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			   struct kvm_memory_slot *dont);
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int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
			    unsigned long npages);
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void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots);
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int kvm_arch_prepare_memory_region(struct kvm *kvm,
				struct kvm_memory_slot *memslot,
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				const struct kvm_userspace_memory_region *mem,
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				enum kvm_mr_change change);
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void kvm_arch_commit_memory_region(struct kvm *kvm,
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				const struct kvm_userspace_memory_region *mem,
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				const struct kvm_memory_slot *old,
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				const struct kvm_memory_slot *new,
573
				enum kvm_mr_change change);
574
bool kvm_largepages_enabled(void);
575
void kvm_disable_largepages(void);
576 577 578 579 580
/* flush all memory translations */
void kvm_arch_flush_shadow_all(struct kvm *kvm);
/* flush memory translations pointing to 'slot' */
void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
				   struct kvm_memory_slot *slot);
581

582 583
int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
			    struct page **pages, int nr_pages);
584

A
Avi Kivity 已提交
585
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
M
Marcelo Tosatti 已提交
586
unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
587
unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
X
Xiao Guangrong 已提交
588
unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
589 590
unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
				      bool *writable);
591 592
void kvm_release_page_clean(struct page *page);
void kvm_release_page_dirty(struct page *page);
593 594
void kvm_set_page_accessed(struct page *page);

D
Dan Williams 已提交
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kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
598
		      bool *writable);
D
Dan Williams 已提交
599 600 601 602 603
kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn);
kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
			       bool atomic, bool *async, bool write_fault,
			       bool *writable);
604

D
Dan Williams 已提交
605 606 607 608
void kvm_release_pfn_clean(kvm_pfn_t pfn);
void kvm_set_pfn_dirty(kvm_pfn_t pfn);
void kvm_set_pfn_accessed(kvm_pfn_t pfn);
void kvm_get_pfn(kvm_pfn_t pfn);
609

610 611
int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
			int len);
612 613
int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
			  unsigned long len);
614
int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
615 616
int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
			   void *data, unsigned long len);
617 618 619 620
int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
			 int offset, int len);
int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
		    unsigned long len);
621 622 623
int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
			   void *data, unsigned long len);
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
624
			      gpa_t gpa, unsigned long len);
625 626
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
A
Avi Kivity 已提交
627
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
628
bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
J
Joerg Roedel 已提交
629
unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
A
Avi Kivity 已提交
630 631
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);

632 633
struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
D
Dan Williams 已提交
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kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn);
kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn);
unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);
int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
			     int len);
int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
			       unsigned long len);
int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
			unsigned long len);
int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, const void *data,
			      int offset, int len);
int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
			 unsigned long len);
void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);

651
void kvm_vcpu_block(struct kvm_vcpu *vcpu);
652 653
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
654
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
655
int kvm_vcpu_yield_to(struct kvm_vcpu *target);
Z
Zhai, Edwin 已提交
656
void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
657 658
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
659

660
void kvm_flush_remote_tlbs(struct kvm *kvm);
661
void kvm_reload_remote_mmus(struct kvm *kvm);
662
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
A
Avi Kivity 已提交
663

664 665
long kvm_arch_dev_ioctl(struct file *filp,
			unsigned int ioctl, unsigned long arg);
666 667
long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg);
668
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
669

670
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
671

672 673
int kvm_get_dirty_log(struct kvm *kvm,
			struct kvm_dirty_log *log, int *is_dirty);
674 675 676 677

int kvm_get_dirty_log_protect(struct kvm *kvm,
			struct kvm_dirty_log *log, bool *is_dirty);

678
void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
679 680 681 682
					struct kvm_memory_slot *slot,
					gfn_t gfn_offset,
					unsigned long mask);

683 684 685
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
				struct kvm_dirty_log *log);

686 687
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
			bool line_status);
688 689
long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg);
690

691 692 693
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);

694 695 696
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				    struct kvm_translation *tr);

697 698 699 700 701 702
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs);
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs);
703 704 705 706
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state);
int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state);
J
Jan Kiszka 已提交
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int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg);
709 710
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);

711 712
int kvm_arch_init(void *opaque);
void kvm_arch_exit(void);
713

714 715 716
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);

R
Radim Krčmář 已提交
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void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);

719 720 721 722
void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
723
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
724
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
725
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
726

727 728
int kvm_arch_hardware_enable(void);
void kvm_arch_hardware_disable(void);
729 730 731
int kvm_arch_hardware_setup(void);
void kvm_arch_hardware_unsetup(void);
void kvm_arch_check_processor_compat(void *rtn);
732
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
733
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
734

735 736
void *kvm_kvzalloc(unsigned long size);

737 738 739 740 741 742 743 744 745 746 747 748
#ifndef __KVM_HAVE_ARCH_VM_ALLOC
static inline struct kvm *kvm_arch_alloc_vm(void)
{
	return kzalloc(sizeof(struct kvm), GFP_KERNEL);
}

static inline void kvm_arch_free_vm(struct kvm *kvm)
{
	kfree(kvm);
}
#endif

749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
#ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
#else
static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
{
}

static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
{
}

static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
{
	return false;
}
#endif
767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
#ifdef __KVM_HAVE_ARCH_ASSIGNED_DEVICE
void kvm_arch_start_assignment(struct kvm *kvm);
void kvm_arch_end_assignment(struct kvm *kvm);
bool kvm_arch_has_assigned_device(struct kvm *kvm);
#else
static inline void kvm_arch_start_assignment(struct kvm *kvm)
{
}

static inline void kvm_arch_end_assignment(struct kvm *kvm)
{
}

static inline bool kvm_arch_has_assigned_device(struct kvm *kvm)
{
	return false;
}
#endif
785

786
static inline struct swait_queue_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
787
{
788 789 790
#ifdef __KVM_HAVE_ARCH_WQP
	return vcpu->arch.wqp;
#else
791 792
	return &vcpu->wq;
#endif
793
}
794

795 796 797 798 799 800 801 802 803 804 805 806 807 808
#ifdef __KVM_HAVE_ARCH_INTC_INITIALIZED
/*
 * returns true if the virtual interrupt controller is initialized and
 * ready to accept virtual IRQ. On some architectures the virtual interrupt
 * controller is dynamically instantiated and this is not always true.
 */
bool kvm_arch_intc_initialized(struct kvm *kvm);
#else
static inline bool kvm_arch_intc_initialized(struct kvm *kvm)
{
	return true;
}
#endif

809
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
810
void kvm_arch_destroy_vm(struct kvm *kvm);
811
void kvm_arch_sync_events(struct kvm *kvm);
812

813
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
814
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
815

D
Dan Williams 已提交
816
bool kvm_is_reserved_pfn(kvm_pfn_t pfn);
817

B
Ben-Ami Yassour 已提交
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struct kvm_irq_ack_notifier {
	struct hlist_node link;
	unsigned gsi;
	void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
};

824 825 826
int kvm_irq_map_gsi(struct kvm *kvm,
		    struct kvm_kernel_irq_routing_entry *entries, int gsi);
int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);
827

828 829
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
		bool line_status);
830
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
831
		int irq_source_id, int level, bool line_status);
832 833 834
int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
			       struct kvm *kvm, int irq_source_id,
			       int level, bool line_status);
835
bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
836
void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
837
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
838 839
void kvm_register_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian);
840 841
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian);
842 843
int kvm_request_irq_source_id(struct kvm *kvm);
void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
B
Ben-Ami Yassour 已提交
844

845
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
846
int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
847
void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
848
#else
B
Ben-Ami Yassour 已提交
849
static inline int kvm_iommu_map_pages(struct kvm *kvm,
850
				      struct kvm_memory_slot *slot)
B
Ben-Ami Yassour 已提交
851 852 853 854
{
	return 0;
}

855 856 857 858
static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
					 struct kvm_memory_slot *slot)
{
}
859
#endif
B
Ben-Ami Yassour 已提交
860

861 862
/* must be called with irqs disabled */
static inline void __kvm_guest_enter(void)
863 864
{
	guest_enter();
865 866
	/* KVM does not hold any references to rcu protected data when it
	 * switches CPU into a guest mode. In fact switching to a guest mode
M
Michael S. Tsirkin 已提交
867
	 * is very similar to exiting to userspace from rcu point of view. In
868 869 870 871
	 * addition CPU may stay in a guest mode for quite a long time (up to
	 * one time slice). Lets treat guest mode as quiescent state, just like
	 * we do with user-mode execution.
	 */
872 873
	if (!context_tracking_cpu_is_enabled())
		rcu_virt_note_context_switch(smp_processor_id());
874 875
}

876 877 878 879 880 881 882 883 884 885 886 887 888 889 890
/* must be called with irqs disabled */
static inline void __kvm_guest_exit(void)
{
	guest_exit();
}

static inline void kvm_guest_enter(void)
{
	unsigned long flags;

	local_irq_save(flags);
	__kvm_guest_enter();
	local_irq_restore(flags);
}

891 892
static inline void kvm_guest_exit(void)
{
893 894 895
	unsigned long flags;

	local_irq_save(flags);
896
	__kvm_guest_exit();
897
	local_irq_restore(flags);
898 899
}

900 901 902 903 904 905 906 907 908
/*
 * search_memslots() and __gfn_to_memslot() are here because they are
 * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
 * gfn_to_memslot() itself isn't here as an inline because that would
 * bloat other code too much.
 */
static inline struct kvm_memory_slot *
search_memslots(struct kvm_memslots *slots, gfn_t gfn)
{
909
	int start = 0, end = slots->used_slots;
910
	int slot = atomic_read(&slots->lru_slot);
911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
	struct kvm_memory_slot *memslots = slots->memslots;

	if (gfn >= memslots[slot].base_gfn &&
	    gfn < memslots[slot].base_gfn + memslots[slot].npages)
		return &memslots[slot];

	while (start < end) {
		slot = start + (end - start) / 2;

		if (gfn >= memslots[slot].base_gfn)
			end = slot;
		else
			start = slot + 1;
	}

	if (gfn >= memslots[start].base_gfn &&
	    gfn < memslots[start].base_gfn + memslots[start].npages) {
		atomic_set(&slots->lru_slot, start);
		return &memslots[start];
	}
931 932 933 934 935 936 937 938 939 940

	return NULL;
}

static inline struct kvm_memory_slot *
__gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
{
	return search_memslots(slots, gfn);
}

941 942 943 944 945 946
static inline unsigned long
__gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
{
	return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
}

947 948 949 950 951
static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
{
	return gfn_to_memslot(kvm, gfn)->id;
}

952 953
static inline gfn_t
hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
954
{
955 956 957
	gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;

	return slot->base_gfn + gfn_offset;
958 959
}

A
Avi Kivity 已提交
960 961 962 963
static inline gpa_t gfn_to_gpa(gfn_t gfn)
{
	return (gpa_t)gfn << PAGE_SHIFT;
}
A
Avi Kivity 已提交
964

965 966 967 968 969
static inline gfn_t gpa_to_gfn(gpa_t gpa)
{
	return (gfn_t)(gpa >> PAGE_SHIFT);
}

D
Dan Williams 已提交
970
static inline hpa_t pfn_to_hpa(kvm_pfn_t pfn)
B
Ben-Ami Yassour 已提交
971 972 973 974
{
	return (hpa_t)pfn << PAGE_SHIFT;
}

975 976 977 978 979 980 981
static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
{
	unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));

	return kvm_is_error_hva(hva);
}

982 983 984 985 986
enum kvm_stat_kind {
	KVM_STAT_VM,
	KVM_STAT_VCPU,
};

987 988 989
struct kvm_stats_debugfs_item {
	const char *name;
	int offset;
990
	enum kvm_stat_kind kind;
991 992
};
extern struct kvm_stats_debugfs_item debugfs_entries[];
993
extern struct dentry *kvm_debugfs_dir;
994

995
#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
996
static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
997
{
998
	if (unlikely(kvm->mmu_notifier_count))
999 1000
		return 1;
	/*
1001 1002 1003 1004 1005 1006 1007 1008
	 * Ensure the read of mmu_notifier_count happens before the read
	 * of mmu_notifier_seq.  This interacts with the smp_wmb() in
	 * mmu_notifier_invalidate_range_end to make sure that the caller
	 * either sees the old (non-zero) value of mmu_notifier_count or
	 * the new (incremented) value of mmu_notifier_seq.
	 * PowerPC Book3s HV KVM calls this under a per-page lock
	 * rather than under kvm->mmu_lock, for scalability, so
	 * can't rely on kvm->mmu_lock to keep things ordered.
1009
	 */
1010
	smp_rmb();
1011
	if (kvm->mmu_notifier_seq != mmu_seq)
1012 1013 1014 1015 1016
		return 1;
	return 0;
}
#endif

1017
#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
1018

1019 1020 1021
#ifdef CONFIG_S390
#define KVM_MAX_IRQ_ROUTES 4096 //FIXME: we can have more than that...
#else
1022
#define KVM_MAX_IRQ_ROUTES 1024
1023
#endif
1024 1025

int kvm_setup_default_irq_routing(struct kvm *kvm);
1026
int kvm_setup_empty_irq_routing(struct kvm *kvm);
1027 1028 1029 1030
int kvm_set_irq_routing(struct kvm *kvm,
			const struct kvm_irq_routing_entry *entries,
			unsigned nr,
			unsigned flags);
1031
int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
1032
			  const struct kvm_irq_routing_entry *ue);
1033 1034 1035 1036 1037 1038 1039 1040
void kvm_free_irq_routing(struct kvm *kvm);

#else

static inline void kvm_free_irq_routing(struct kvm *kvm) {}

#endif

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int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);

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#ifdef CONFIG_HAVE_KVM_EVENTFD

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void kvm_eventfd_init(struct kvm *kvm);
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int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);

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#ifdef CONFIG_HAVE_KVM_IRQFD
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int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
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void kvm_irqfd_release(struct kvm *kvm);
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void kvm_irq_routing_update(struct kvm *);
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#else
static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
{
	return -EINVAL;
}

static inline void kvm_irqfd_release(struct kvm *kvm) {}
#endif
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#else

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static inline void kvm_eventfd_init(struct kvm *kvm) {}
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static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
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{
	return -EINVAL;
}

static inline void kvm_irqfd_release(struct kvm *kvm) {}
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#ifdef CONFIG_HAVE_KVM_IRQCHIP
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static inline void kvm_irq_routing_update(struct kvm *kvm)
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{
}
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#endif
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void kvm_arch_irq_routing_update(struct kvm *kvm);
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static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
{
	return -ENOSYS;
}
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#endif /* CONFIG_HAVE_KVM_EVENTFD */

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#ifdef CONFIG_KVM_APIC_ARCHITECTURE
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bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
#else
static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
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#endif
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static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
{
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	/*
	 * Ensure the rest of the request is published to kvm_check_request's
	 * caller.  Paired with the smp_mb__after_atomic in kvm_check_request.
	 */
	smp_wmb();
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	set_bit(req, &vcpu->requests);
}

static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
{
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	if (test_bit(req, &vcpu->requests)) {
		clear_bit(req, &vcpu->requests);
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		/*
		 * Ensure the rest of the request is visible to kvm_check_request's
		 * caller.  Paired with the smp_wmb in kvm_make_request.
		 */
		smp_mb__after_atomic();
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		return true;
	} else {
		return false;
	}
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}

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extern bool kvm_rebooting;

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struct kvm_device {
	struct kvm_device_ops *ops;
	struct kvm *kvm;
	void *private;
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	struct list_head vm_node;
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};

/* create, destroy, and name are mandatory */
struct kvm_device_ops {
	const char *name;
	int (*create)(struct kvm_device *dev, u32 type);

	/*
	 * Destroy is responsible for freeing dev.
	 *
	 * Destroy may be called before or after destructors are called
	 * on emulated I/O regions, depending on whether a reference is
	 * held by a vcpu or other kvm component that gets destroyed
	 * after the emulated I/O.
	 */
	void (*destroy)(struct kvm_device *dev);

	int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
	int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
	int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
	long (*ioctl)(struct kvm_device *dev, unsigned int ioctl,
		      unsigned long arg);
};

void kvm_device_get(struct kvm_device *dev);
void kvm_device_put(struct kvm_device *dev);
struct kvm_device *kvm_device_from_filp(struct file *filp);
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int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
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void kvm_unregister_device_ops(u32 type);
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extern struct kvm_device_ops kvm_mpic_ops;
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extern struct kvm_device_ops kvm_xics_ops;
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extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
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extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
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#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT

static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
{
	vcpu->spin_loop.in_spin_loop = val;
}
static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
{
	vcpu->spin_loop.dy_eligible = val;
}

#else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */

static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
{
}

static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
{
}
#endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
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#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *,
			   struct irq_bypass_producer *);
void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *,
			   struct irq_bypass_producer *);
void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *);
void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *);
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int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
				  uint32_t guest_irq, bool set);
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#endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */
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#endif