[linux-block.git] / include / linux / kvm_host.h

#ifndef __KVM_HOST_H
#define __KVM_HOST_H

/*
 * 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>
#include <linux/hardirq.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/preempt.h>
#include <linux/msi.h>
#include <asm/signal.h>

#include <linux/kvm.h>
#include <linux/kvm_para.h>

#include <linux/kvm_types.h>

#include <asm/kvm_host.h>

/*
 * vcpu->requests bit members
 */
#define KVM_REQ_TLB_FLUSH          0
#define KVM_REQ_MIGRATE_TIMER      1
#define KVM_REQ_REPORT_TPR_ACCESS  2
#define KVM_REQ_MMU_RELOAD         3
#define KVM_REQ_TRIPLE_FAULT       4
#define KVM_REQ_PENDING_TIMER      5
#define KVM_REQ_UNHALT             6
#define KVM_REQ_MMU_SYNC           7
#define KVM_REQ_KVMCLOCK_UPDATE    8
#define KVM_REQ_KICK               9

#define KVM_USERSPACE_IRQ_SOURCE_ID	0

struct kvm;
struct kvm_vcpu;
extern struct kmem_cache *kvm_vcpu_cache;

/*
 * It would be nice to use something smarter than a linear search, TBD...
 * Thankfully we dont expect many devices to register (famous last words :),
 * so until then it will suffice.  At least its abstracted so we can change
 * in one place.
 */
struct kvm_io_bus {
	int                   dev_count;
#define NR_IOBUS_DEVS 6
	struct kvm_io_device *devs[NR_IOBUS_DEVS];
};

void kvm_io_bus_init(struct kvm_io_bus *bus);
void kvm_io_bus_destroy(struct kvm_io_bus *bus);
int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr, int len,
		     const void *val);
int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len,
		    void *val);
int __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
			       struct kvm_io_device *dev);
int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
			    struct kvm_io_device *dev);
void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus,
				 struct kvm_io_device *dev);
void kvm_io_bus_unregister_dev(struct kvm *kvm, struct kvm_io_bus *bus,
			       struct kvm_io_device *dev);

struct kvm_vcpu {
	struct kvm *kvm;
#ifdef CONFIG_PREEMPT_NOTIFIERS
	struct preempt_notifier preempt_notifier;
#endif
	int vcpu_id;
	struct mutex mutex;
	int   cpu;
	struct kvm_run *run;
	unsigned long requests;
	unsigned long guest_debug;
	int fpu_active;
	int guest_fpu_loaded;
	wait_queue_head_t wq;
	int sigset_active;
	sigset_t sigset;
	struct kvm_vcpu_stat stat;

#ifdef CONFIG_HAS_IOMEM
	int mmio_needed;
	int mmio_read_completed;
	int mmio_is_write;
	int mmio_size;
	unsigned char mmio_data[8];
	gpa_t mmio_phys_addr;
#endif

	struct kvm_vcpu_arch arch;
};

struct kvm_memory_slot {
	gfn_t base_gfn;
	unsigned long npages;
	unsigned long flags;
	unsigned long *rmap;
	unsigned long *dirty_bitmap;
	struct {
		unsigned long rmap_pde;
		int write_count;
	} *lpage_info[KVM_NR_PAGE_SIZES - 1];
	unsigned long userspace_addr;
	int user_alloc;
};

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

#ifdef __KVM_HAVE_IOAPIC

struct kvm_irq_routing_table {
	int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
	struct kvm_kernel_irq_routing_entry *rt_entries;
	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];
};

#else

struct kvm_irq_routing_table {};

#endif

struct kvm {
	spinlock_t mmu_lock;
	spinlock_t requests_lock;
	struct rw_semaphore slots_lock;
	struct mm_struct *mm; /* userspace tied to this vm */
	int nmemslots;
	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
					KVM_PRIVATE_MEM_SLOTS];
#ifdef CONFIG_KVM_APIC_ARCHITECTURE
	u32 bsp_vcpu_id;
	struct kvm_vcpu *bsp_vcpu;
#endif
	struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
	atomic_t online_vcpus;
	struct list_head vm_list;
	struct mutex lock;
	struct kvm_io_bus mmio_bus;
	struct kvm_io_bus pio_bus;
#ifdef CONFIG_HAVE_KVM_EVENTFD
	struct {
		spinlock_t        lock;
		struct list_head  items;
	} irqfds;
	struct list_head ioeventfds;
#endif
	struct kvm_vm_stat stat;
	struct kvm_arch arch;
	atomic_t users_count;
#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
	struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
	struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
#endif

	struct mutex irq_lock;
#ifdef CONFIG_HAVE_KVM_IRQCHIP
	struct kvm_irq_routing_table *irq_routing;
	struct hlist_head mask_notifier_list;
	struct hlist_head irq_ack_notifier_list;
#endif

#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
	struct mmu_notifier mmu_notifier;
	unsigned long mmu_notifier_seq;
	long mmu_notifier_count;
#endif
};

/* The guest did something we don't support. */
#define pr_unimpl(vcpu, fmt, ...)					\
 do {									\
	if (printk_ratelimit())						\
		printk(KERN_ERR "kvm: %i: cpu%i " fmt,			\
		       current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
 } while (0)

#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)

static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
{
	smp_rmb();
	return kvm->vcpus[i];
}

#define kvm_for_each_vcpu(idx, vcpup, kvm) \
	for (idx = 0, vcpup = kvm_get_vcpu(kvm, idx); \
	     idx < atomic_read(&kvm->online_vcpus) && vcpup; \
	     vcpup = kvm_get_vcpu(kvm, ++idx))

int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);

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

int kvm_init(void *opaque, unsigned int vcpu_size,
		  struct module *module);
void kvm_exit(void);

void kvm_get_kvm(struct kvm *kvm);
void kvm_put_kvm(struct kvm *kvm);

#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);

extern struct page *bad_page;
extern pfn_t bad_pfn;

int is_error_page(struct page *page);
int is_error_pfn(pfn_t pfn);
int kvm_is_error_hva(unsigned long addr);
int kvm_set_memory_region(struct kvm *kvm,
			  struct kvm_userspace_memory_region *mem,
			  int user_alloc);
int __kvm_set_memory_region(struct kvm *kvm,
			    struct kvm_userspace_memory_region *mem,
			    int user_alloc);
int kvm_arch_set_memory_region(struct kvm *kvm,
				struct kvm_userspace_memory_region *mem,
				struct kvm_memory_slot old,
				int user_alloc);
void kvm_disable_largepages(void);
void kvm_arch_flush_shadow(struct kvm *kvm);
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
void kvm_release_page_clean(struct page *page);
void kvm_release_page_dirty(struct page *page);
void kvm_set_page_dirty(struct page *page);
void kvm_set_page_accessed(struct page *page);

pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
void kvm_release_pfn_dirty(pfn_t);
void kvm_release_pfn_clean(pfn_t pfn);
void kvm_set_pfn_dirty(pfn_t pfn);
void kvm_set_pfn_accessed(pfn_t pfn);
void kvm_get_pfn(pfn_t pfn);

int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
			int len);
int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
			  unsigned long len);
int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
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);
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);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);

void kvm_vcpu_block(struct kvm_vcpu *vcpu);
void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
void kvm_resched(struct kvm_vcpu *vcpu);
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_flush_remote_tlbs(struct kvm *kvm);
void kvm_reload_remote_mmus(struct kvm *kvm);

long kvm_arch_dev_ioctl(struct file *filp,
			unsigned int ioctl, unsigned long arg);
long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg);

int kvm_dev_ioctl_check_extension(long ext);

int kvm_get_dirty_log(struct kvm *kvm,
			struct kvm_dirty_log *log, int *is_dirty);
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
				struct kvm_dirty_log *log);

int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
				   struct
				   kvm_userspace_memory_region *mem,
				   int user_alloc);
long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg);

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);

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

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);
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);
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg);
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);

int kvm_arch_init(void *opaque);
void kvm_arch_exit(void);

int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);

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);
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);

int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
int kvm_arch_hardware_enable(void *garbage);
void kvm_arch_hardware_disable(void *garbage);
int kvm_arch_hardware_setup(void);
void kvm_arch_hardware_unsetup(void);
void kvm_arch_check_processor_compat(void *rtn);
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);

void kvm_free_physmem(struct kvm *kvm);

struct  kvm *kvm_arch_create_vm(void);
void kvm_arch_destroy_vm(struct kvm *kvm);
void kvm_free_all_assigned_devices(struct kvm *kvm);
void kvm_arch_sync_events(struct kvm *kvm);

int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);

int kvm_is_mmio_pfn(pfn_t pfn);

struct kvm_irq_ack_notifier {
	struct hlist_node link;
	unsigned gsi;
	void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
};

#define KVM_ASSIGNED_MSIX_PENDING		0x1
struct kvm_guest_msix_entry {
	u32 vector;
	u16 entry;
	u16 flags;
};

struct kvm_assigned_dev_kernel {
	struct kvm_irq_ack_notifier ack_notifier;
	struct work_struct interrupt_work;
	struct list_head list;
	int assigned_dev_id;
	int host_busnr;
	int host_devfn;
	unsigned int entries_nr;
	int host_irq;
	bool host_irq_disabled;
	struct msix_entry *host_msix_entries;
	int guest_irq;
	struct kvm_guest_msix_entry *guest_msix_entries;
	unsigned long irq_requested_type;
	int irq_source_id;
	int flags;
	struct pci_dev *dev;
	struct kvm *kvm;
	spinlock_t assigned_dev_lock;
};

struct kvm_irq_mask_notifier {
	void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
	int irq;
	struct hlist_node link;
};

void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
				    struct kvm_irq_mask_notifier *kimn);
void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
				      struct kvm_irq_mask_notifier *kimn);
void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask);

#ifdef __KVM_HAVE_IOAPIC
void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
				   union kvm_ioapic_redirect_entry *entry,
				   unsigned long *deliver_bitmask);
#endif
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_register_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian);
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
				   struct kvm_irq_ack_notifier *kian);
int kvm_request_irq_source_id(struct kvm *kvm);
void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);

/* For vcpu->arch.iommu_flags */
#define KVM_IOMMU_CACHE_COHERENCY	0x1

#ifdef CONFIG_IOMMU_API
int kvm_iommu_map_pages(struct kvm *kvm, gfn_t base_gfn,
			unsigned long npages);
int kvm_iommu_map_guest(struct kvm *kvm);
int kvm_iommu_unmap_guest(struct kvm *kvm);
int kvm_assign_device(struct kvm *kvm,
		      struct kvm_assigned_dev_kernel *assigned_dev);
int kvm_deassign_device(struct kvm *kvm,
			struct kvm_assigned_dev_kernel *assigned_dev);
#else /* CONFIG_IOMMU_API */
static inline int kvm_iommu_map_pages(struct kvm *kvm,
				      gfn_t base_gfn,
				      unsigned long npages)
{
	return 0;
}

static inline int kvm_iommu_map_guest(struct kvm *kvm)
{
	return -ENODEV;
}

static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
{
	return 0;
}

static inline int kvm_assign_device(struct kvm *kvm,
		struct kvm_assigned_dev_kernel *assigned_dev)
{
	return 0;
}

static inline int kvm_deassign_device(struct kvm *kvm,
		struct kvm_assigned_dev_kernel *assigned_dev)
{
	return 0;
}
#endif /* CONFIG_IOMMU_API */

static inline void kvm_guest_enter(void)
{
	account_system_vtime(current);
	current->flags |= PF_VCPU;
}

static inline void kvm_guest_exit(void)
{
	account_system_vtime(current);
	current->flags &= ~PF_VCPU;
}

static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
{
	return slot - kvm->memslots;
}

static inline gpa_t gfn_to_gpa(gfn_t gfn)
{
	return (gpa_t)gfn << PAGE_SHIFT;
}

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

static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
{
	set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
}

enum kvm_stat_kind {
	KVM_STAT_VM,
	KVM_STAT_VCPU,
};

struct kvm_stats_debugfs_item {
	const char *name;
	int offset;
	enum kvm_stat_kind kind;
	struct dentry *dentry;
};
extern struct kvm_stats_debugfs_item debugfs_entries[];
extern struct dentry *kvm_debugfs_dir;

#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
{
	if (unlikely(vcpu->kvm->mmu_notifier_count))
		return 1;
	/*
	 * Both reads happen under the mmu_lock and both values are
	 * modified under mmu_lock, so there's no need of smb_rmb()
	 * here in between, otherwise mmu_notifier_count should be
	 * read before mmu_notifier_seq, see
	 * mmu_notifier_invalidate_range_end write side.
	 */
	if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
		return 1;
	return 0;
}
#endif

#ifdef CONFIG_HAVE_KVM_IRQCHIP

#define KVM_MAX_IRQ_ROUTES 1024

int kvm_setup_default_irq_routing(struct kvm *kvm);
int kvm_set_irq_routing(struct kvm *kvm,
			const struct kvm_irq_routing_entry *entries,
			unsigned nr,
			unsigned flags);
void kvm_free_irq_routing(struct kvm *kvm);

#else

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

#endif

#ifdef CONFIG_HAVE_KVM_EVENTFD

void kvm_eventfd_init(struct kvm *kvm);
int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
void kvm_irqfd_release(struct kvm *kvm);
int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);

#else

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

static inline void kvm_irqfd_release(struct kvm *kvm) {}
static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
{
	return -ENOSYS;
}

#endif /* CONFIG_HAVE_KVM_EVENTFD */

#ifdef CONFIG_KVM_APIC_ARCHITECTURE
static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
{
	return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
}
#endif

#ifdef __KVM_HAVE_DEVICE_ASSIGNMENT

long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
				  unsigned long arg);

#else

static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
						unsigned long arg)
{
	return -ENOTTY;
}

#endif

#endif
Commit	Line	Data
	1	#ifndef __KVM_HOST_H
	2	#define __KVM_HOST_H
	3
	4	/*
	5	* This work is licensed under the terms of the GNU GPL, version 2. See
	6	* the COPYING file in the top-level directory.
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/hardirq.h>
	11	#include <linux/list.h>
	12	#include <linux/mutex.h>
	13	#include <linux/spinlock.h>
	14	#include <linux/signal.h>
	15	#include <linux/sched.h>
	16	#include <linux/mm.h>
	17	#include <linux/preempt.h>
	18	#include <linux/msi.h>
	19	#include <asm/signal.h>
	20
	21	#include <linux/kvm.h>
	22	#include <linux/kvm_para.h>
	23
	24	#include <linux/kvm_types.h>
	25
	26	#include <asm/kvm_host.h>
	27
	28	/*
	29	* vcpu->requests bit members
	30	*/
	31	#define KVM_REQ_TLB_FLUSH 0
	32	#define KVM_REQ_MIGRATE_TIMER 1
	33	#define KVM_REQ_REPORT_TPR_ACCESS 2
	34	#define KVM_REQ_MMU_RELOAD 3
	35	#define KVM_REQ_TRIPLE_FAULT 4
	36	#define KVM_REQ_PENDING_TIMER 5
	37	#define KVM_REQ_UNHALT 6
	38	#define KVM_REQ_MMU_SYNC 7
	39	#define KVM_REQ_KVMCLOCK_UPDATE 8
	40	#define KVM_REQ_KICK 9
	41
	42	#define KVM_USERSPACE_IRQ_SOURCE_ID 0
	43
	44	struct kvm;
	45	struct kvm_vcpu;
	46	extern struct kmem_cache *kvm_vcpu_cache;
	47
	48	/*
	49	* It would be nice to use something smarter than a linear search, TBD...
	50	* Thankfully we dont expect many devices to register (famous last words :),
	51	* so until then it will suffice. At least its abstracted so we can change
	52	* in one place.
	53	*/
	54	struct kvm_io_bus {
	55	int dev_count;
	56	#define NR_IOBUS_DEVS 6
	57	struct kvm_io_device *devs[NR_IOBUS_DEVS];
	58	};
	59
	60	void kvm_io_bus_init(struct kvm_io_bus *bus);
	61	void kvm_io_bus_destroy(struct kvm_io_bus *bus);
	62	int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr, int len,
	63	const void *val);
	64	int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len,
	65	void *val);
	66	int __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
	67	struct kvm_io_device *dev);
	68	int kvm_io_bus_register_dev(struct kvm kvm, struct kvm_io_bus bus,
	69	struct kvm_io_device *dev);
	70	void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus,
	71	struct kvm_io_device *dev);
	72	void kvm_io_bus_unregister_dev(struct kvm kvm, struct kvm_io_bus bus,
	73	struct kvm_io_device *dev);
	74
	75	struct kvm_vcpu {
	76	struct kvm *kvm;
	77	#ifdef CONFIG_PREEMPT_NOTIFIERS
	78	struct preempt_notifier preempt_notifier;
	79	#endif
	80	int vcpu_id;
	81	struct mutex mutex;
	82	int cpu;
	83	struct kvm_run *run;
	84	unsigned long requests;
	85	unsigned long guest_debug;
	86	int fpu_active;
	87	int guest_fpu_loaded;
	88	wait_queue_head_t wq;
	89	int sigset_active;
	90	sigset_t sigset;
	91	struct kvm_vcpu_stat stat;
	92
	93	#ifdef CONFIG_HAS_IOMEM
	94	int mmio_needed;
	95	int mmio_read_completed;
	96	int mmio_is_write;
	97	int mmio_size;
	98	unsigned char mmio_data[8];
	99	gpa_t mmio_phys_addr;
	100	#endif
	101
	102	struct kvm_vcpu_arch arch;
	103	};
	104
	105	struct kvm_memory_slot {
	106	gfn_t base_gfn;
	107	unsigned long npages;
	108	unsigned long flags;
	109	unsigned long *rmap;
	110	unsigned long *dirty_bitmap;
	111	struct {
	112	unsigned long rmap_pde;
	113	int write_count;
	114	} *lpage_info[KVM_NR_PAGE_SIZES - 1];
	115	unsigned long userspace_addr;
	116	int user_alloc;
	117	};
	118
	119	struct kvm_kernel_irq_routing_entry {
	120	u32 gsi;
	121	u32 type;
	122	int (set)(struct kvm_kernel_irq_routing_entry e,
	123	struct kvm *kvm, int irq_source_id, int level);
	124	union {
	125	struct {
	126	unsigned irqchip;
	127	unsigned pin;
	128	} irqchip;
	129	struct msi_msg msi;
	130	};
	131	struct hlist_node link;
	132	};
	133
	134	#ifdef __KVM_HAVE_IOAPIC
	135
	136	struct kvm_irq_routing_table {
	137	int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
	138	struct kvm_kernel_irq_routing_entry *rt_entries;
	139	u32 nr_rt_entries;
	140	/*
	141	* Array indexed by gsi. Each entry contains list of irq chips
	142	* the gsi is connected to.
	143	*/
	144	struct hlist_head map[0];
	145	};
	146
	147	#else
	148
	149	struct kvm_irq_routing_table {};
	150
	151	#endif
	152
	153	struct kvm {
	154	spinlock_t mmu_lock;
	155	spinlock_t requests_lock;
	156	struct rw_semaphore slots_lock;
	157	struct mm_struct mm; / userspace tied to this vm */
	158	int nmemslots;
	159	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
	160	KVM_PRIVATE_MEM_SLOTS];
	161	#ifdef CONFIG_KVM_APIC_ARCHITECTURE
	162	u32 bsp_vcpu_id;
	163	struct kvm_vcpu *bsp_vcpu;
	164	#endif
	165	struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
	166	atomic_t online_vcpus;
	167	struct list_head vm_list;
	168	struct mutex lock;
	169	struct kvm_io_bus mmio_bus;
	170	struct kvm_io_bus pio_bus;
	171	#ifdef CONFIG_HAVE_KVM_EVENTFD
	172	struct {
	173	spinlock_t lock;
	174	struct list_head items;
	175	} irqfds;
	176	struct list_head ioeventfds;
	177	#endif
	178	struct kvm_vm_stat stat;
	179	struct kvm_arch arch;
	180	atomic_t users_count;
	181	#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
	182	struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
	183	struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
	184	#endif
	185
	186	struct mutex irq_lock;
	187	#ifdef CONFIG_HAVE_KVM_IRQCHIP
	188	struct kvm_irq_routing_table *irq_routing;
	189	struct hlist_head mask_notifier_list;
	190	struct hlist_head irq_ack_notifier_list;
	191	#endif
	192
	193	#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
	194	struct mmu_notifier mmu_notifier;
	195	unsigned long mmu_notifier_seq;
	196	long mmu_notifier_count;
	197	#endif
	198	};
	199
	200	/* The guest did something we don't support. */
	201	#define pr_unimpl(vcpu, fmt, ...) \
	202	do { \
	203	if (printk_ratelimit()) \
	204	printk(KERN_ERR "kvm: %i: cpu%i " fmt, \
	205	current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
	206	} while (0)
	207
	208	#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
	209	#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
	210
	211	static inline struct kvm_vcpu kvm_get_vcpu(struct kvm kvm, int i)
	212	{
	213	smp_rmb();
	214	return kvm->vcpus[i];
	215	}
	216
	217	#define kvm_for_each_vcpu(idx, vcpup, kvm) \
	218	for (idx = 0, vcpup = kvm_get_vcpu(kvm, idx); \
	219	idx < atomic_read(&kvm->online_vcpus) && vcpup; \
	220	vcpup = kvm_get_vcpu(kvm, ++idx))
	221
	222	int kvm_vcpu_init(struct kvm_vcpu vcpu, struct kvm kvm, unsigned id);
	223	void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
	224
	225	void vcpu_load(struct kvm_vcpu *vcpu);
	226	void vcpu_put(struct kvm_vcpu *vcpu);
	227
	228	int kvm_init(void *opaque, unsigned int vcpu_size,
	229	struct module *module);
	230	void kvm_exit(void);
	231
	232	void kvm_get_kvm(struct kvm *kvm);
	233	void kvm_put_kvm(struct kvm *kvm);
	234
	235	#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
	236	#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
	237	static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
	238	struct page gva_to_page(struct kvm_vcpu vcpu, gva_t gva);
	239
	240	extern struct page *bad_page;
	241	extern pfn_t bad_pfn;
	242
	243	int is_error_page(struct page *page);
	244	int is_error_pfn(pfn_t pfn);
	245	int kvm_is_error_hva(unsigned long addr);
	246	int kvm_set_memory_region(struct kvm *kvm,
	247	struct kvm_userspace_memory_region *mem,
	248	int user_alloc);
	249	int __kvm_set_memory_region(struct kvm *kvm,
	250	struct kvm_userspace_memory_region *mem,
	251	int user_alloc);
	252	int kvm_arch_set_memory_region(struct kvm *kvm,
	253	struct kvm_userspace_memory_region *mem,
	254	struct kvm_memory_slot old,
	255	int user_alloc);
	256	void kvm_disable_largepages(void);
	257	void kvm_arch_flush_shadow(struct kvm *kvm);
	258	gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
	259	struct page gfn_to_page(struct kvm kvm, gfn_t gfn);
	260	unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
	261	void kvm_release_page_clean(struct page *page);
	262	void kvm_release_page_dirty(struct page *page);
	263	void kvm_set_page_dirty(struct page *page);
	264	void kvm_set_page_accessed(struct page *page);
	265
	266	pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
	267	void kvm_release_pfn_dirty(pfn_t);
	268	void kvm_release_pfn_clean(pfn_t pfn);
	269	void kvm_set_pfn_dirty(pfn_t pfn);
	270	void kvm_set_pfn_accessed(pfn_t pfn);
	271	void kvm_get_pfn(pfn_t pfn);
	272
	273	int kvm_read_guest_page(struct kvm kvm, gfn_t gfn, void data, int offset,
	274	int len);
	275	int kvm_read_guest_atomic(struct kvm kvm, gpa_t gpa, void data,
	276	unsigned long len);
	277	int kvm_read_guest(struct kvm kvm, gpa_t gpa, void data, unsigned long len);
	278	int kvm_write_guest_page(struct kvm kvm, gfn_t gfn, const void data,
	279	int offset, int len);
	280	int kvm_write_guest(struct kvm kvm, gpa_t gpa, const void data,
	281	unsigned long len);
	282	int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
	283	int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
	284	struct kvm_memory_slot gfn_to_memslot(struct kvm kvm, gfn_t gfn);
	285	int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
	286	void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
	287
	288	void kvm_vcpu_block(struct kvm_vcpu *vcpu);
	289	void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
	290	void kvm_resched(struct kvm_vcpu *vcpu);
	291	void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
	292	void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
	293	void kvm_flush_remote_tlbs(struct kvm *kvm);
	294	void kvm_reload_remote_mmus(struct kvm *kvm);
	295
	296	long kvm_arch_dev_ioctl(struct file *filp,
	297	unsigned int ioctl, unsigned long arg);
	298	long kvm_arch_vcpu_ioctl(struct file *filp,
	299	unsigned int ioctl, unsigned long arg);
	300
	301	int kvm_dev_ioctl_check_extension(long ext);
	302
	303	int kvm_get_dirty_log(struct kvm *kvm,
	304	struct kvm_dirty_log log, int is_dirty);
	305	int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
	306	struct kvm_dirty_log *log);
	307
	308	int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
	309	struct
	310	kvm_userspace_memory_region *mem,
	311	int user_alloc);
	312	long kvm_arch_vm_ioctl(struct file *filp,
	313	unsigned int ioctl, unsigned long arg);
	314
	315	int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu);
	316	int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu);
	317
	318	int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
	319	struct kvm_translation *tr);
	320
	321	int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu vcpu, struct kvm_regs regs);
	322	int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu vcpu, struct kvm_regs regs);
	323	int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
	324	struct kvm_sregs *sregs);
	325	int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
	326	struct kvm_sregs *sregs);
	327	int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
	328	struct kvm_mp_state *mp_state);
	329	int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
	330	struct kvm_mp_state *mp_state);
	331	int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
	332	struct kvm_guest_debug *dbg);
	333	int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu vcpu, struct kvm_run kvm_run);
	334
	335	int kvm_arch_init(void *opaque);
	336	void kvm_arch_exit(void);
	337
	338	int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
	339	void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
	340
	341	void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
	342	void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
	343	void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
	344	struct kvm_vcpu kvm_arch_vcpu_create(struct kvm kvm, unsigned int id);
	345	int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
	346	void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
	347
	348	int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
	349	int kvm_arch_hardware_enable(void *garbage);
	350	void kvm_arch_hardware_disable(void *garbage);
	351	int kvm_arch_hardware_setup(void);
	352	void kvm_arch_hardware_unsetup(void);
	353	void kvm_arch_check_processor_compat(void *rtn);
	354	int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
	355
	356	void kvm_free_physmem(struct kvm *kvm);
	357
	358	struct kvm *kvm_arch_create_vm(void);
	359	void kvm_arch_destroy_vm(struct kvm *kvm);
	360	void kvm_free_all_assigned_devices(struct kvm *kvm);
	361	void kvm_arch_sync_events(struct kvm *kvm);
	362
	363	int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
	364	void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
	365
	366	int kvm_is_mmio_pfn(pfn_t pfn);
	367
	368	struct kvm_irq_ack_notifier {
	369	struct hlist_node link;
	370	unsigned gsi;
	371	void (irq_acked)(struct kvm_irq_ack_notifier kian);
	372	};
	373
	374	#define KVM_ASSIGNED_MSIX_PENDING 0x1
	375	struct kvm_guest_msix_entry {
	376	u32 vector;
	377	u16 entry;
	378	u16 flags;
	379	};
	380
	381	struct kvm_assigned_dev_kernel {
	382	struct kvm_irq_ack_notifier ack_notifier;
	383	struct work_struct interrupt_work;
	384	struct list_head list;
	385	int assigned_dev_id;
	386	int host_busnr;
	387	int host_devfn;
	388	unsigned int entries_nr;
	389	int host_irq;
	390	bool host_irq_disabled;
	391	struct msix_entry *host_msix_entries;
	392	int guest_irq;
	393	struct kvm_guest_msix_entry *guest_msix_entries;
	394	unsigned long irq_requested_type;
	395	int irq_source_id;
	396	int flags;
	397	struct pci_dev *dev;
	398	struct kvm *kvm;
	399	spinlock_t assigned_dev_lock;
	400	};
	401
	402	struct kvm_irq_mask_notifier {
	403	void (func)(struct kvm_irq_mask_notifier kimn, bool masked);
	404	int irq;
	405	struct hlist_node link;
	406	};
	407
	408	void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
	409	struct kvm_irq_mask_notifier *kimn);
	410	void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
	411	struct kvm_irq_mask_notifier *kimn);
	412	void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask);
	413
	414	#ifdef __KVM_HAVE_IOAPIC
	415	void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
	416	union kvm_ioapic_redirect_entry *entry,
	417	unsigned long *deliver_bitmask);
	418	#endif
	419	int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
	420	void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
	421	void kvm_register_irq_ack_notifier(struct kvm *kvm,
	422	struct kvm_irq_ack_notifier *kian);
	423	void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
	424	struct kvm_irq_ack_notifier *kian);
	425	int kvm_request_irq_source_id(struct kvm *kvm);
	426	void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
	427
	428	/* For vcpu->arch.iommu_flags */
	429	#define KVM_IOMMU_CACHE_COHERENCY 0x1
	430
	431	#ifdef CONFIG_IOMMU_API
	432	int kvm_iommu_map_pages(struct kvm *kvm, gfn_t base_gfn,
	433	unsigned long npages);
	434	int kvm_iommu_map_guest(struct kvm *kvm);
	435	int kvm_iommu_unmap_guest(struct kvm *kvm);
	436	int kvm_assign_device(struct kvm *kvm,
	437	struct kvm_assigned_dev_kernel *assigned_dev);
	438	int kvm_deassign_device(struct kvm *kvm,
	439	struct kvm_assigned_dev_kernel *assigned_dev);
	440	#else /* CONFIG_IOMMU_API */
	441	static inline int kvm_iommu_map_pages(struct kvm *kvm,
	442	gfn_t base_gfn,
	443	unsigned long npages)
	444	{
	445	return 0;
	446	}
	447
	448	static inline int kvm_iommu_map_guest(struct kvm *kvm)
	449	{
	450	return -ENODEV;
	451	}
	452
	453	static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
	454	{
	455	return 0;
	456	}
	457
	458	static inline int kvm_assign_device(struct kvm *kvm,
	459	struct kvm_assigned_dev_kernel *assigned_dev)
	460	{
	461	return 0;
	462	}
	463
	464	static inline int kvm_deassign_device(struct kvm *kvm,
	465	struct kvm_assigned_dev_kernel *assigned_dev)
	466	{
	467	return 0;
	468	}
	469	#endif /* CONFIG_IOMMU_API */
	470
	471	static inline void kvm_guest_enter(void)
	472	{
	473	account_system_vtime(current);
	474	current->flags \|= PF_VCPU;
	475	}
	476
	477	static inline void kvm_guest_exit(void)
	478	{
	479	account_system_vtime(current);
	480	current->flags &= ~PF_VCPU;
	481	}
	482
	483	static inline int memslot_id(struct kvm kvm, struct kvm_memory_slot slot)
	484	{
	485	return slot - kvm->memslots;
	486	}
	487
	488	static inline gpa_t gfn_to_gpa(gfn_t gfn)
	489	{
	490	return (gpa_t)gfn << PAGE_SHIFT;
	491	}
	492
	493	static inline hpa_t pfn_to_hpa(pfn_t pfn)
	494	{
	495	return (hpa_t)pfn << PAGE_SHIFT;
	496	}
	497
	498	static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
	499	{
	500	set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
	501	}
	502
	503	enum kvm_stat_kind {
	504	KVM_STAT_VM,
	505	KVM_STAT_VCPU,
	506	};
	507
	508	struct kvm_stats_debugfs_item {
	509	const char *name;
	510	int offset;
	511	enum kvm_stat_kind kind;
	512	struct dentry *dentry;
	513	};
	514	extern struct kvm_stats_debugfs_item debugfs_entries[];
	515	extern struct dentry *kvm_debugfs_dir;
	516
	517	#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
	518	static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
	519	{
	520	if (unlikely(vcpu->kvm->mmu_notifier_count))
	521	return 1;
	522	/*
	523	* Both reads happen under the mmu_lock and both values are
	524	* modified under mmu_lock, so there's no need of smb_rmb()
	525	* here in between, otherwise mmu_notifier_count should be
	526	* read before mmu_notifier_seq, see
	527	* mmu_notifier_invalidate_range_end write side.
	528	*/
	529	if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
	530	return 1;
	531	return 0;
	532	}
	533	#endif
	534
	535	#ifdef CONFIG_HAVE_KVM_IRQCHIP
	536
	537	#define KVM_MAX_IRQ_ROUTES 1024
	538
	539	int kvm_setup_default_irq_routing(struct kvm *kvm);
	540	int kvm_set_irq_routing(struct kvm *kvm,
	541	const struct kvm_irq_routing_entry *entries,
	542	unsigned nr,
	543	unsigned flags);
	544	void kvm_free_irq_routing(struct kvm *kvm);
	545
	546	#else
	547
	548	static inline void kvm_free_irq_routing(struct kvm *kvm) {}
	549
	550	#endif
	551
	552	#ifdef CONFIG_HAVE_KVM_EVENTFD
	553
	554	void kvm_eventfd_init(struct kvm *kvm);
	555	int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags);
	556	void kvm_irqfd_release(struct kvm *kvm);
	557	int kvm_ioeventfd(struct kvm kvm, struct kvm_ioeventfd args);
	558
	559	#else
	560
	561	static inline void kvm_eventfd_init(struct kvm *kvm) {}
	562	static inline int kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
	563	{
	564	return -EINVAL;
	565	}
	566
	567	static inline void kvm_irqfd_release(struct kvm *kvm) {}
	568	static inline int kvm_ioeventfd(struct kvm kvm, struct kvm_ioeventfd args)
	569	{
	570	return -ENOSYS;
	571	}
	572
	573	#endif /* CONFIG_HAVE_KVM_EVENTFD */
	574
	575	#ifdef CONFIG_KVM_APIC_ARCHITECTURE
	576	static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
	577	{
	578	return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
	579	}
	580	#endif
	581
	582	#ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
	583
	584	long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
	585	unsigned long arg);
	586
	587	#else
	588
	589	static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
	590	unsigned long arg)
	591	{
	592	return -ENOTTY;
	593	}
	594
	595	#endif
	596
	597	#endif
	598