kvm_host.h 38.3 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/vmalloc.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 <linux/refcount.h>
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#include <linux/nospec.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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#ifndef KVM_MAX_VCPU_ID
#define KVM_MAX_VCPU_ID KVM_MAX_VCPUS
#endif

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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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/*
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 * Bit 63 of the memslot generation number is an "update in-progress flag",
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 * e.g. is temporarily set for the duration of install_new_memslots().
 * This flag effectively creates a unique generation number that is used to
 * mark cached memslot data, e.g. MMIO accesses, as potentially being stale,
 * i.e. may (or may not) have come from the previous memslots generation.
 *
 * This is necessary because the actual memslots update is not atomic with
 * respect to the generation number update.  Updating the generation number
 * first would allow a vCPU to cache a spte from the old memslots using the
 * new generation number, and updating the generation number after switching
 * to the new memslots would allow cache hits using the old generation number
 * to reference the defunct memslots.
 *
 * This mechanism is used to prevent getting hits in KVM's caches while a
 * memslot update is in-progress, and to prevent cache hits *after* updating
 * the actual generation number against accesses that were inserted into the
 * cache *before* the memslots were updated.
 */
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#define KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS	BIT_ULL(63)
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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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#define KVM_REQUEST_MASK           GENMASK(7,0)
#define KVM_REQUEST_NO_WAKEUP      BIT(8)
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#define KVM_REQUEST_WAIT           BIT(9)
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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 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_MMU_RELOAD        (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_PENDING_TIMER     2
#define KVM_REQ_UNHALT            3
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#define KVM_REQUEST_ARCH_BASE     8

#define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
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	BUILD_BUG_ON((unsigned)(nr) >= (FIELD_SIZEOF(struct kvm_vcpu, requests) * 8) - KVM_REQUEST_ARCH_BASE); \
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	(unsigned)(((nr) + KVM_REQUEST_ARCH_BASE) | (flags)); \
})
#define KVM_ARCH_REQ(nr)           KVM_ARCH_REQ_FLAGS(nr, 0)
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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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void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
			       struct kvm_io_device *dev);
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struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
					 gpa_t addr);
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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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	u64 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 guest_xcr0_loaded;
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	struct swait_queue_head wq;
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	struct pid __rcu *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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	bool valid_wakeup;
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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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	struct dentry *debugfs_dentry;
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};

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static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
{
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	/*
	 * The memory barrier ensures a previous write to vcpu->requests cannot
	 * be reordered with the read of vcpu->mode.  It pairs with the general
	 * memory barrier following the write of vcpu->mode in VCPU RUN.
	 */
	smp_mb__before_atomic();
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	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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static inline unsigned long *kvm_second_dirty_bitmap(struct kvm_memory_slot *memslot)
{
	unsigned long len = kvm_dirty_bitmap_bytes(memslot);

	return memslot->dirty_bitmap + len / sizeof(*memslot->dirty_bitmap);
}

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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 {
			u32 address_lo;
			u32 address_hi;
			u32 data;
			u32 flags;
			u32 devid;
		} 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 __rcu *memslots[KVM_ADDRESS_SPACE_NUM];
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	struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
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	/*
	 * created_vcpus is protected by kvm->lock, and is incremented
	 * at the beginning of KVM_CREATE_VCPU.  online_vcpus is only
	 * incremented after storing the kvm_vcpu pointer in vcpus,
	 * and is accessed atomically.
	 */
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	atomic_t online_vcpus;
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	int created_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 __rcu *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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	refcount_t users_count;
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#ifdef CONFIG_KVM_MMIO
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	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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	bool manual_dirty_log_protect;
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	struct dentry *debugfs_dentry;
	struct kvm_stat_data **debugfs_stat_data;
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	struct srcu_struct srcu;
	struct srcu_struct irq_srcu;
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	pid_t userspace_pid;
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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__)
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#define kvm_debug_ratelimited(fmt, ...) \
	pr_debug_ratelimited("kvm [%i]: " fmt, task_pid_nr(current), \
			     ## __VA_ARGS__)
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#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_debug_ratelimited(vcpu, fmt, ...)				\
	kvm_debug_ratelimited("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_io_bus *kvm_get_bus(struct kvm *kvm, enum kvm_bus idx)
{
	return srcu_dereference_check(kvm->buses[idx], &kvm->srcu,
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				      lockdep_is_held(&kvm->slots_lock) ||
				      !refcount_read(&kvm->users_count));
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}

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static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
{
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	int num_vcpus = atomic_read(&kvm->online_vcpus);
	i = array_index_nospec(i, num_vcpus);

	/* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu.  */
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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)
{
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	struct kvm_vcpu *vcpu = NULL;
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	int i;

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	if (id < 0)
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		return NULL;
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	if (id < KVM_MAX_VCPUS)
		vcpu = kvm_get_vcpu(kvm, id);
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	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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static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu)
{
	struct kvm_vcpu *tmp;
	int idx;

	kvm_for_each_vcpu(idx, tmp, vcpu->kvm)
		if (tmp == vcpu)
			return idx;
	BUG();
}

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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);

567
void vcpu_load(struct kvm_vcpu *vcpu);
568 569
void vcpu_put(struct kvm_vcpu *vcpu);

570
#ifdef __KVM_HAVE_IOAPIC
571
void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm);
572
void kvm_arch_post_irq_routing_update(struct kvm *kvm);
573
#else
574
static inline void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm)
575 576
{
}
577
static inline void kvm_arch_post_irq_routing_update(struct kvm *kvm)
578 579
{
}
580 581
#endif

582
#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
595
int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
596
		  struct module *module);
597
void kvm_exit(void);
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Avi Kivity 已提交
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Izik Eidus 已提交
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void kvm_get_kvm(struct kvm *kvm);
void kvm_put_kvm(struct kvm *kvm);

602
static inline struct kvm_memslots *__kvm_memslots(struct kvm *kvm, int as_id)
603
{
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Paolo Bonzini 已提交
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	as_id = array_index_nospec(as_id, KVM_ADDRESS_SPACE_NUM);
605
	return srcu_dereference_check(kvm->memslots[as_id], &kvm->srcu,
606 607
			lockdep_is_held(&kvm->slots_lock) ||
			!refcount_read(&kvm->users_count));
608 609
}

610 611 612 613 614
static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
{
	return __kvm_memslots(kvm, 0);
}

615 616
static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu)
{
617 618 619
	int as_id = kvm_arch_vcpu_memslots_id(vcpu);

	return __kvm_memslots(vcpu->kvm, as_id);
620 621
}

622 623 624
static inline struct kvm_memory_slot *
id_to_memslot(struct kvm_memslots *slots, int id)
{
625 626
	int index = slots->id_to_index[id];
	struct kvm_memory_slot *slot;
627

628
	slot = &slots->memslots[index];
629

630 631
	WARN_ON(slot->id != id);
	return slot;
632 633
}

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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,
};

652
int kvm_set_memory_region(struct kvm *kvm,
653
			  const struct kvm_userspace_memory_region *mem);
654
int __kvm_set_memory_region(struct kvm *kvm,
655
			    const struct kvm_userspace_memory_region *mem);
656
void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
657
			   struct kvm_memory_slot *dont);
658 659
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
			    unsigned long npages);
660
void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen);
661 662
int kvm_arch_prepare_memory_region(struct kvm *kvm,
				struct kvm_memory_slot *memslot,
663
				const struct kvm_userspace_memory_region *mem,
664
				enum kvm_mr_change change);
665
void kvm_arch_commit_memory_region(struct kvm *kvm,
666
				const struct kvm_userspace_memory_region *mem,
667
				const struct kvm_memory_slot *old,
668
				const struct kvm_memory_slot *new,
669
				enum kvm_mr_change change);
670
bool kvm_largepages_enabled(void);
671
void kvm_disable_largepages(void);
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/* 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);
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int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
			    struct page **pages, int nr_pages);
680

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Avi Kivity 已提交
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struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
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Marcelo Tosatti 已提交
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unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
683
unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
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Xiao Guangrong 已提交
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unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
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unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
				      bool *writable);
687 688
void kvm_release_page_clean(struct page *page);
void kvm_release_page_dirty(struct page *page);
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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,
694
		      bool *writable);
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Dan Williams 已提交
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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);
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D
Dan Williams 已提交
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void kvm_release_pfn_clean(kvm_pfn_t pfn);
702
void kvm_release_pfn_dirty(kvm_pfn_t pfn);
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Dan Williams 已提交
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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);
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707 708
int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
			int len);
709 710
int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
			  unsigned long len);
711
int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
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int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
			   void *data, unsigned long len);
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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);
718 719 720
int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
			   void *data, unsigned long len);
int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
721 722
				  void *data, unsigned int offset,
				  unsigned long len);
723 724
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
			      gpa_t gpa, unsigned long len);
725 726
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);
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Avi Kivity 已提交
727
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
728
bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
J
Joerg Roedel 已提交
729
unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
A
Avi Kivity 已提交
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void mark_page_dirty(struct kvm *kvm, gfn_t gfn);

732 733
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);
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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);
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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);

751 752 753
void kvm_sigset_activate(struct kvm_vcpu *vcpu);
void kvm_sigset_deactivate(struct kvm_vcpu *vcpu);

754
void kvm_vcpu_block(struct kvm_vcpu *vcpu);
755 756
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
757
bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);
758
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
759
int kvm_vcpu_yield_to(struct kvm_vcpu *target);
760
void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool usermode_vcpu_not_eligible);
761

762
void kvm_flush_remote_tlbs(struct kvm *kvm);
763
void kvm_reload_remote_mmus(struct kvm *kvm);
764 765 766

bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
				 unsigned long *vcpu_bitmap, cpumask_var_t tmp);
767
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
A
Avi Kivity 已提交
768

769 770
long kvm_arch_dev_ioctl(struct file *filp,
			unsigned int ioctl, unsigned long arg);
771 772
long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg);
773
vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
774

775
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
776

777 778
int kvm_get_dirty_log(struct kvm *kvm,
			struct kvm_dirty_log *log, int *is_dirty);
779 780

int kvm_get_dirty_log_protect(struct kvm *kvm,
781
			      struct kvm_dirty_log *log, bool *flush);
782 783
int kvm_clear_dirty_log_protect(struct kvm *kvm,
				struct kvm_clear_dirty_log *log, bool *flush);
784

785
void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
786 787 788 789
					struct kvm_memory_slot *slot,
					gfn_t gfn_offset,
					unsigned long mask);

790 791
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
				struct kvm_dirty_log *log);
792 793
int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm,
				  struct kvm_clear_dirty_log *log);
794

795 796
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
			bool line_status);
797 798
int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
			    struct kvm_enable_cap *cap);
799 800
long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg);
801

802 803 804
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);

805 806 807
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				    struct kvm_translation *tr);

808 809 810 811 812 813
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);
814 815 816 817
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);
820 821
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);

822 823
int kvm_arch_init(void *opaque);
void kvm_arch_exit(void);
824

825 826 827
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);

830 831 832 833
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);
834
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
835
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
836
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
837

838 839 840
bool kvm_arch_has_vcpu_debugfs(void);
int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu);

841 842
int kvm_arch_hardware_enable(void);
void kvm_arch_hardware_disable(void);
843 844 845
int kvm_arch_hardware_setup(void);
void kvm_arch_hardware_unsetup(void);
void kvm_arch_check_processor_compat(void *rtn);
846
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
847
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
848
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
849

850
#ifndef __KVM_HAVE_ARCH_VM_ALLOC
851 852 853 854
/*
 * All architectures that want to use vzalloc currently also
 * need their own kvm_arch_alloc_vm implementation.
 */
855 856 857 858 859 860 861 862 863 864 865
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

866 867 868 869 870 871 872
#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB
static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm)
{
	return -ENOTSUPP;
}
#endif

873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890
#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
891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
#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
909

910
static inline struct swait_queue_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
911
{
912 913 914
#ifdef __KVM_HAVE_ARCH_WQP
	return vcpu->arch.wqp;
#else
915 916
	return &vcpu->wq;
#endif
917
}
918

919 920 921 922 923 924 925 926 927 928 929 930 931 932
#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

933
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
934
void kvm_arch_destroy_vm(struct kvm *kvm);
935
void kvm_arch_sync_events(struct kvm *kvm);
936

937
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
938
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
939

D
Dan Williams 已提交
940
bool kvm_is_reserved_pfn(kvm_pfn_t pfn);
941

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);
};

948 949 950
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);
951

952 953
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
		bool line_status);
954
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
955
		int irq_source_id, int level, bool line_status);
956 957 958
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);
959
bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
960
void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
961
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
962 963
void kvm_register_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian);
964 965
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian);
966 967
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
968

969 970 971 972 973 974 975 976 977
/*
 * 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)
{
978
	int start = 0, end = slots->used_slots;
979
	int slot = atomic_read(&slots->lru_slot);
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999
	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];
	}
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009

	return NULL;
}

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

1010 1011 1012 1013 1014 1015
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;
}

1016 1017 1018 1019 1020
static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
{
	return gfn_to_memslot(kvm, gfn)->id;
}

1021 1022
static inline gfn_t
hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
1023
{
1024 1025 1026
	gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;

	return slot->base_gfn + gfn_offset;
1027 1028
}

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static inline gpa_t gfn_to_gpa(gfn_t gfn)
{
	return (gpa_t)gfn << PAGE_SHIFT;
}
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Avi Kivity 已提交
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static inline gfn_t gpa_to_gfn(gpa_t gpa)
{
	return (gfn_t)(gpa >> PAGE_SHIFT);
}

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static inline hpa_t pfn_to_hpa(kvm_pfn_t pfn)
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{
	return (hpa_t)pfn << PAGE_SHIFT;
}

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static inline struct page *kvm_vcpu_gpa_to_page(struct kvm_vcpu *vcpu,
						gpa_t gpa)
{
	return kvm_vcpu_gfn_to_page(vcpu, gpa_to_gfn(gpa));
}

1050 1051 1052 1053 1054 1055 1056
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);
}

1057 1058 1059 1060 1061
enum kvm_stat_kind {
	KVM_STAT_VM,
	KVM_STAT_VCPU,
};

1062 1063 1064 1065 1066
struct kvm_stat_data {
	int offset;
	struct kvm *kvm;
};

1067 1068 1069
struct kvm_stats_debugfs_item {
	const char *name;
	int offset;
1070
	enum kvm_stat_kind kind;
1071 1072
};
extern struct kvm_stats_debugfs_item debugfs_entries[];
1073
extern struct dentry *kvm_debugfs_dir;
1074

1075
#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
1076
static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
1077
{
1078
	if (unlikely(kvm->mmu_notifier_count))
1079 1080
		return 1;
	/*
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	 * 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.
1089
	 */
1090
	smp_rmb();
1091
	if (kvm->mmu_notifier_seq != mmu_seq)
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		return 1;
	return 0;
}
#endif

1097
#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
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1099
#define KVM_MAX_IRQ_ROUTES 4096 /* might need extension/rework in the future */
1100

1101
bool kvm_arch_can_set_irq_routing(struct kvm *kvm);
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int kvm_set_irq_routing(struct kvm *kvm,
			const struct kvm_irq_routing_entry *entries,
			unsigned nr,
			unsigned flags);
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int kvm_set_routing_entry(struct kvm *kvm,
			  struct kvm_kernel_irq_routing_entry *e,
1108
			  const struct kvm_irq_routing_entry *ue);
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void kvm_free_irq_routing(struct kvm *kvm);

#else

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

#endif

1117 1118
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);

1124
#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);
1127
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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1141
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)
1150 1151
{
}
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#endif
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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 */

1161 1162
void kvm_arch_irq_routing_update(struct kvm *kvm);

1163 1164
static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
{
1165 1166 1167 1168 1169
	/*
	 * 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();
1170
	set_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
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}

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Radim Krčmář 已提交
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static inline bool kvm_request_pending(struct kvm_vcpu *vcpu)
{
	return READ_ONCE(vcpu->requests);
}

1178 1179
static inline bool kvm_test_request(int req, struct kvm_vcpu *vcpu)
{
1180
	return test_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
1181 1182 1183 1184
}

static inline void kvm_clear_request(int req, struct kvm_vcpu *vcpu)
{
1185
	clear_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
1186 1187
}

1188 1189
static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
{
1190 1191
	if (kvm_test_request(req, vcpu)) {
		kvm_clear_request(req, vcpu);
1192 1193 1194 1195 1196 1197

		/*
		 * 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();
1198 1199 1200 1201
		return true;
	} else {
		return false;
	}
1202 1203
}

1204 1205
extern bool kvm_rebooting;

1206 1207
extern unsigned int halt_poll_ns;
extern unsigned int halt_poll_ns_grow;
1208
extern unsigned int halt_poll_ns_grow_start;
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extern unsigned int halt_poll_ns_shrink;

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struct kvm_device {
	struct kvm_device_ops *ops;
	struct kvm *kvm;
	void *private;
1215
	struct list_head vm_node;
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};

/* create, destroy, and name are mandatory */
struct kvm_device_ops {
	const char *name;
1221 1222 1223 1224 1225 1226

	/*
	 * create is called holding kvm->lock and any operations not suitable
	 * to do while holding the lock should be deferred to init (see
	 * below).
	 */
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	int (*create)(struct kvm_device *dev, u32 type);

1229 1230 1231 1232 1233 1234
	/*
	 * init is called after create if create is successful and is called
	 * outside of holding kvm->lock.
	 */
	void (*init)(struct kvm_device *dev);

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	/*
	 * 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);
1255
int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
1256
void kvm_unregister_device_ops(u32 type);
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1258
extern struct kvm_device_ops kvm_mpic_ops;
1259
extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
1260
extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
1261

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
#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 */
1283 1284

#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
1285
bool kvm_arch_has_irq_bypass(void);
1286 1287 1288 1289 1290 1291
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 *);
1292 1293
int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
				  uint32_t guest_irq, bool set);
1294
#endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */
1295

1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
#ifdef CONFIG_HAVE_KVM_INVALID_WAKEUPS
/* If we wakeup during the poll time, was it a sucessful poll? */
static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
{
	return vcpu->valid_wakeup;
}

#else
static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
{
	return true;
}
#endif /* CONFIG_HAVE_KVM_INVALID_WAKEUPS */

1310 1311 1312 1313 1314 1315 1316 1317 1318 1319
#ifdef CONFIG_HAVE_KVM_NO_POLL
/* Callback that tells if we must not poll */
bool kvm_arch_no_poll(struct kvm_vcpu *vcpu);
#else
static inline bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
{
	return false;
}
#endif /* CONFIG_HAVE_KVM_NO_POLL */

1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
#ifdef CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL
long kvm_arch_vcpu_async_ioctl(struct file *filp,
			       unsigned int ioctl, unsigned long arg);
#else
static inline long kvm_arch_vcpu_async_ioctl(struct file *filp,
					     unsigned int ioctl,
					     unsigned long arg)
{
	return -ENOIOCTLCMD;
}
#endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */

1332 1333
int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
		unsigned long start, unsigned long end, bool blockable);
1334

1335 1336 1337 1338 1339 1340 1341 1342 1343
#ifdef CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE
int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu);
#else
static inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
{
	return 0;
}
#endif /* CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE */

1344
#endif