/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * This header defines architecture specific interfaces, x86 version
 */

#ifndef _ASM_X86_KVM_HOST_H
#define _ASM_X86_KVM_HOST_H

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/mmu_notifier.h>
#include <linux/tracepoint.h>
#include <linux/cpumask.h>
#include <linux/irq_work.h>
#include <linux/irq.h>
#include <linux/workqueue.h>

#include <linux/kvm.h>
#include <linux/kvm_para.h>
#include <linux/kvm_types.h>
#include <linux/perf_event.h>
#include <linux/pvclock_gtod.h>
#include <linux/clocksource.h>
#include <linux/irqbypass.h>
#include <linux/kfifo.h>
#include <linux/sched/vhost_task.h>
#include <linux/call_once.h>
#include <linux/atomic.h>

#include <asm/apic.h>
#include <asm/pvclock-abi.h>
#include <asm/debugreg.h>
#include <asm/desc.h>
#include <asm/mtrr.h>
#include <asm/msr-index.h>
#include <asm/msr.h>
#include <asm/asm.h>
#include <asm/irq_remapping.h>
#include <asm/kvm_page_track.h>
#include <asm/kvm_vcpu_regs.h>
#include <asm/virt.h>

#include <hyperv/hvhdk.h>

#define __KVM_HAVE_ARCH_VCPU_DEBUGFS

/*
 * CONFIG_KVM_MAX_NR_VCPUS is defined iff CONFIG_KVM!=n, provide a dummy max if
 * KVM is disabled (arbitrarily use the default from CONFIG_KVM_MAX_NR_VCPUS).
 */
#ifdef CONFIG_KVM_MAX_NR_VCPUS
#define KVM_MAX_VCPUS CONFIG_KVM_MAX_NR_VCPUS
#else
#define KVM_MAX_VCPUS 1024
#endif

/*
 * In x86, the VCPU ID corresponds to the APIC ID, and APIC IDs
 * might be larger than the actual number of VCPUs because the
 * APIC ID encodes CPU topology information.
 *
 * In the worst case, we'll need less than one extra bit for the
 * Core ID, and less than one extra bit for the Package (Die) ID,
 * so ratio of 4 should be enough.
 */
#define KVM_VCPU_ID_RATIO 4
#define KVM_MAX_VCPU_IDS (KVM_MAX_VCPUS * KVM_VCPU_ID_RATIO)

/* memory slots that are not exposed to userspace */
#define KVM_INTERNAL_MEM_SLOTS 3

#define KVM_HALT_POLL_NS_DEFAULT 200000

#define KVM_IRQCHIP_NUM_PINS  KVM_IOAPIC_NUM_PINS

#define KVM_DIRTY_LOG_MANUAL_CAPS   (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | \
					KVM_DIRTY_LOG_INITIALLY_SET)

/* x86-specific vcpu->requests bit members */
#define KVM_REQ_MIGRATE_TIMER		KVM_ARCH_REQ(0)
#define KVM_REQ_REPORT_TPR_ACCESS	KVM_ARCH_REQ(1)
#define KVM_REQ_TRIPLE_FAULT		KVM_ARCH_REQ(2)
#define KVM_REQ_MMU_SYNC		KVM_ARCH_REQ(3)
#define KVM_REQ_CLOCK_UPDATE		KVM_ARCH_REQ(4)
#define KVM_REQ_LOAD_MMU_PGD		KVM_ARCH_REQ(5)
#define KVM_REQ_EVENT			KVM_ARCH_REQ(6)
#define KVM_REQ_APF_HALT		KVM_ARCH_REQ(7)
#define KVM_REQ_STEAL_UPDATE		KVM_ARCH_REQ(8)
#define KVM_REQ_NMI			KVM_ARCH_REQ(9)
#define KVM_REQ_PMU			KVM_ARCH_REQ(10)
#define KVM_REQ_PMI			KVM_ARCH_REQ(11)
#ifdef CONFIG_KVM_SMM
#define KVM_REQ_SMI			KVM_ARCH_REQ(12)
#endif
#define KVM_REQ_MASTERCLOCK_UPDATE	KVM_ARCH_REQ(13)
#define KVM_REQ_MCLOCK_INPROGRESS \
	KVM_ARCH_REQ_FLAGS(14, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_SCAN_IOAPIC \
	KVM_ARCH_REQ_FLAGS(15, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_GLOBAL_CLOCK_UPDATE	KVM_ARCH_REQ(16)
#define KVM_REQ_APIC_PAGE_RELOAD \
	KVM_ARCH_REQ_FLAGS(17, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_HV_CRASH		KVM_ARCH_REQ(18)
#define KVM_REQ_IOAPIC_EOI_EXIT		KVM_ARCH_REQ(19)
#define KVM_REQ_HV_RESET		KVM_ARCH_REQ(20)
#define KVM_REQ_HV_EXIT			KVM_ARCH_REQ(21)
#define KVM_REQ_HV_STIMER		KVM_ARCH_REQ(22)
#define KVM_REQ_LOAD_EOI_EXITMAP	KVM_ARCH_REQ(23)
#define KVM_REQ_GET_NESTED_STATE_PAGES	KVM_ARCH_REQ(24)
#define KVM_REQ_APICV_UPDATE \
	KVM_ARCH_REQ_FLAGS(25, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_TLB_FLUSH_CURRENT	KVM_ARCH_REQ(26)
#define KVM_REQ_TLB_FLUSH_GUEST \
	KVM_ARCH_REQ_FLAGS(27, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_APF_READY		KVM_ARCH_REQ(28)
#define KVM_REQ_RECALC_INTERCEPTS	KVM_ARCH_REQ(29)
#define KVM_REQ_UPDATE_CPU_DIRTY_LOGGING \
	KVM_ARCH_REQ_FLAGS(30, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_MMU_FREE_OBSOLETE_ROOTS \
	KVM_ARCH_REQ_FLAGS(31, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_HV_TLB_FLUSH \
	KVM_ARCH_REQ_FLAGS(32, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_VMSA_PAGE_RELOAD \
	KVM_ARCH_REQ_FLAGS(33, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_UPDATE_PROTECTED_GUEST_STATE \
	KVM_ARCH_REQ_FLAGS(34, KVM_REQUEST_WAIT)

#define INVALID_PAGE (~(hpa_t)0)
#define VALID_PAGE(x) ((x) != INVALID_PAGE)

/* KVM Hugepage definitions for x86 */
#define KVM_MAX_HUGEPAGE_LEVEL	PG_LEVEL_1G
#define KVM_NR_PAGE_SIZES	(KVM_MAX_HUGEPAGE_LEVEL - PG_LEVEL_4K + 1)
#define KVM_HPAGE_GFN_SHIFT(x)	(((x) - 1) * 9)
#define KVM_HPAGE_SHIFT(x)	(PAGE_SHIFT + KVM_HPAGE_GFN_SHIFT(x))
#define KVM_HPAGE_SIZE(x)	(1UL << KVM_HPAGE_SHIFT(x))
#define KVM_HPAGE_MASK(x)	(~(KVM_HPAGE_SIZE(x) - 1))
#define KVM_PAGES_PER_HPAGE(x)	(KVM_HPAGE_SIZE(x) / PAGE_SIZE)

#define KVM_MAX_CPUID_ENTRIES 256
#define KVM_NR_VAR_MTRR 8

#define ASYNC_PF_PER_VCPU 64

enum kvm_reg {
	VCPU_REGS_RAX = __VCPU_REGS_RAX,
	VCPU_REGS_RCX = __VCPU_REGS_RCX,
	VCPU_REGS_RDX = __VCPU_REGS_RDX,
	VCPU_REGS_RBX = __VCPU_REGS_RBX,
	VCPU_REGS_RSP = __VCPU_REGS_RSP,
	VCPU_REGS_RBP = __VCPU_REGS_RBP,
	VCPU_REGS_RSI = __VCPU_REGS_RSI,
	VCPU_REGS_RDI = __VCPU_REGS_RDI,
#ifdef CONFIG_X86_64
	VCPU_REGS_R8  = 8,
	VCPU_REGS_R9,
	VCPU_REGS_R10,
	VCPU_REGS_R11,
	VCPU_REGS_R12,
	VCPU_REGS_R13,
	VCPU_REGS_R14,
	VCPU_REGS_R15,
#endif
	NR_VCPU_GENERAL_PURPOSE_REGS,

	VCPU_REG_RIP = NR_VCPU_GENERAL_PURPOSE_REGS,

	VCPU_REG_PDPTR,
	VCPU_REG_CR0,
	/*
	 * Alias AMD's ERAPS (not a real register) to CR3 so that common code
	 * can trigger emulation of the RAP (Return Address Predictor) with
	 * minimal support required in common code.  Piggyback CR3 as the RAP
	 * is cleared on writes to CR3, i.e. marking CR3 dirty will naturally
	 * mark ERAPS dirty as well.
	 */
	VCPU_REG_CR3,
	VCPU_REG_ERAPS = VCPU_REG_CR3,
	VCPU_REG_CR4,
	VCPU_REG_RFLAGS,
	VCPU_REG_SEGMENTS,
	VCPU_REG_EXIT_INFO_1,
	VCPU_REG_EXIT_INFO_2,

	NR_VCPU_TOTAL_REGS,
};

enum {
	VCPU_SREG_ES,
	VCPU_SREG_CS,
	VCPU_SREG_SS,
	VCPU_SREG_DS,
	VCPU_SREG_FS,
	VCPU_SREG_GS,
	VCPU_SREG_TR,
	VCPU_SREG_LDTR,
};

enum exit_fastpath_completion {
	EXIT_FASTPATH_NONE,
	EXIT_FASTPATH_REENTER_GUEST,
	EXIT_FASTPATH_EXIT_HANDLED,
	EXIT_FASTPATH_EXIT_USERSPACE,
};
typedef enum exit_fastpath_completion fastpath_t;

struct x86_emulate_ctxt;
struct x86_exception;
union kvm_smram;
enum x86_intercept;
enum x86_intercept_stage;

#define KVM_NR_DB_REGS	4

#define PFERR_PRESENT_MASK	BIT(0)
#define PFERR_WRITE_MASK	BIT(1)
#define PFERR_USER_MASK		BIT(2)
#define PFERR_RSVD_MASK		BIT(3)
#define PFERR_FETCH_MASK	BIT(4)
#define PFERR_PK_MASK		BIT(5)
#define PFERR_SS_MASK		BIT(6)
#define PFERR_SGX_MASK		BIT(15)
#define PFERR_GUEST_RMP_MASK	BIT_ULL(31)
#define PFERR_GUEST_FINAL_MASK	BIT_ULL(32)
#define PFERR_GUEST_PAGE_MASK	BIT_ULL(33)
#define PFERR_GUEST_FAULT_STAGE_MASK \
	(PFERR_GUEST_FINAL_MASK | PFERR_GUEST_PAGE_MASK)
#define PFERR_GUEST_ENC_MASK	BIT_ULL(34)
#define PFERR_GUEST_SIZEM_MASK	BIT_ULL(35)
#define PFERR_GUEST_VMPL_MASK	BIT_ULL(36)

/*
 * IMPLICIT_ACCESS is a KVM-defined flag used to correctly perform SMAP checks
 * when emulating instructions that triggers implicit access.
 */
#define PFERR_IMPLICIT_ACCESS	BIT_ULL(48)
/*
 * PRIVATE_ACCESS is a KVM-defined flag us to indicate that a fault occurred
 * when the guest was accessing private memory.
 */
#define PFERR_PRIVATE_ACCESS   BIT_ULL(49)
#define PFERR_SYNTHETIC_MASK   (PFERR_IMPLICIT_ACCESS | PFERR_PRIVATE_ACCESS)

struct kvm_kernel_irqfd;
struct kvm_kernel_irq_routing_entry;

struct kvm_apic_map;

struct kvm_x86_msr_filter;
struct kvm_x86_pmu_event_filter;

struct kvm_caps {
	/* control of guest tsc rate supported? */
	bool has_tsc_control;
	/* maximum supported tsc_khz for guests */
	u32  max_guest_tsc_khz;
	/* number of bits of the fractional part of the TSC scaling ratio */
	u8   tsc_scaling_ratio_frac_bits;
	/* maximum allowed value of TSC scaling ratio */
	u64  max_tsc_scaling_ratio;
	/* 1ull << kvm_caps.tsc_scaling_ratio_frac_bits */
	u64  default_tsc_scaling_ratio;
	/* bus lock detection supported? */
	bool has_bus_lock_exit;
	/* notify VM exit supported? */
	bool has_notify_vmexit;
	/* bit mask of VM types */
	u32 supported_vm_types;

	u64 supported_mce_cap;
	u64 supported_xcr0;
	u64 supported_xss;
	u64 supported_perf_cap;

	u64 supported_efer_bits;

	u64 supported_quirks;
	u64 inapplicable_quirks;
};
extern struct kvm_caps kvm_caps;

struct kvm_host_values {
	/*
	 * The host's raw MAXPHYADDR, i.e. the number of non-reserved physical
	 * address bits irrespective of features that repurpose legal bits,
	 * e.g. MKTME.
	 */
	u8 maxphyaddr;

	u64 efer;
	u64 xcr0;
	u64 xss;
	u64 s_cet;
	u64 arch_capabilities;
};
extern struct kvm_host_values kvm_host;

/*
 * kvm_mmu_page_role tracks the properties of a shadow page (where shadow page
 * also includes TDP pages) to determine whether or not a page can be used in
 * the given MMU context.  This is a subset of the overall kvm_cpu_role to
 * minimize the size of kvm_memory_slot.arch.gfn_write_track, i.e. allows
 * allocating 2 bytes per gfn instead of 4 bytes per gfn.
 *
 * Upper-level shadow pages having gptes are tracked for write-protection via
 * gfn_write_track.  As above, gfn_write_track is a 16 bit counter, so KVM must
 * not create more than 2^16-1 upper-level shadow pages at a single gfn,
 * otherwise gfn_write_track will overflow and explosions will ensue.
 *
 * A unique shadow page (SP) for a gfn is created if and only if an existing SP
 * cannot be reused.  The ability to reuse a SP is tracked by its role, which
 * incorporates various mode bits and properties of the SP.  Roughly speaking,
 * the number of unique SPs that can theoretically be created is 2^n, where n
 * is the number of bits that are used to compute the role.
 *
 * But, even though there are 21 bits in the mask below, not all combinations
 * of modes and flags are possible:
 *
 *   - invalid shadow pages are not accounted, mirror pages are not shadowed,
 *     so the bits are effectively 19.
 *
 *   - quadrant will only be used if has_4_byte_gpte=1 (non-PAE paging);
 *     execonly and ad_disabled are only used for nested EPT which has
 *     has_4_byte_gpte=0.  Therefore, 2 bits are always unused.
 *
 *   - the 4 bits of level are effectively limited to the values 2/3/4/5,
 *     as 4k SPs are not tracked (allowed to go unsync).  In addition non-PAE
 *     paging has exactly one upper level, making level completely redundant
 *     when has_4_byte_gpte=1.
 *
 *   - on top of this, smap_andnot_wp is only set if cr0_wp=0,
 *     therefore these two bits only give rise to 3 possibilities.
 *
 * Therefore, the maximum number of possible upper-level shadow pages for a
 * single gfn is a bit less than 2^14.
 */
union kvm_mmu_page_role {
	u32 word;
	struct {
		unsigned level:4;
		unsigned has_4_byte_gpte:1;
		unsigned quadrant:2;
		unsigned direct:1;
		unsigned access:4;
		unsigned invalid:1;
		unsigned efer_nx:1;
		unsigned cr0_wp:1;
		unsigned smap_andnot_wp:1;
		unsigned ad_disabled:1;
		unsigned guest_mode:1;
		unsigned passthrough:1;
		unsigned is_mirror:1;

		/*
		 * cr4_smep is also set for EPT MBEC.  Because it affects
		 * which pages are considered non-present (bit 10 additionally
		 * must be zero if MBEC is on) it has to be in the base role.
		 * It also has to be in the base role for AMD GMET because
		 * kernel-executable pages need to have U=0 with GMET enabled.
		 */
		unsigned cr4_smep:1;

		unsigned:3;

		/*
		 * This is left at the top of the word so that
		 * kvm_memslots_for_spte_role can extract it with a
		 * simple shift.  While there is room, give it a whole
		 * byte so it is also faster to load it from memory.
		 */
		unsigned smm:8;
	};
};

/*
 * kvm_mmu_extended_role complements kvm_mmu_page_role, tracking properties
 * relevant to the current MMU configuration.   When loading CR0, CR4, or EFER,
 * including on nested transitions, if nothing in the full role changes then
 * MMU re-configuration can be skipped. @valid bit is set on first usage so we
 * don't treat all-zero structure as valid data.
 *
 * The properties that are tracked in the extended role but not the page role
 * are for things that either (a) do not affect the validity of the shadow page
 * or (b) are indirectly reflected in the shadow page's role.  For example,
 * CR4.PKE only affects permission checks for software walks of the guest page
 * tables (because KVM doesn't support Protection Keys with shadow paging), and
 * CR0.PG, CR4.PAE, and CR4.PSE are indirectly reflected in role.level.
 *
 * Note, SMAP is not redundant with smap_andnot_wp in the page role.  If
 * CR0.WP=1, KVM can reuse shadow pages for the guest regardless of SMAP,
 * but the MMU's permission checks for software walks need to be SMAP
 * aware regardless of CR0.WP.
 */
union kvm_mmu_extended_role {
	u32 word;
	struct {
		unsigned int valid:1;
		unsigned int execonly:1;
		unsigned int cr4_pse:1;
		unsigned int cr4_pke:1;
		unsigned int cr4_smap:1;
		unsigned int cr4_la57:1;
		unsigned int efer_lma:1;

		/*
		 * True if either CR4.SMEP or EFER.NXE are set.  For AMD NPT
		 * this is the "real" host CR4.SMEP whereas cr4_smep is
		 * actually GMET.
		 */
		unsigned int has_pferr_fetch:1;
	};
};

union kvm_cpu_role {
	u64 as_u64;
	struct {
		union kvm_mmu_page_role base;
		union kvm_mmu_extended_role ext;
	};
};

struct kvm_rmap_head {
	atomic_long_t val;
};

struct kvm_pio_request {
	unsigned long count;
	int in;
	int port;
	int size;
};

#define PT64_ROOT_MAX_LEVEL 5

struct kvm_page_format {
	u64 rsvd_bits_mask[2][PT64_ROOT_MAX_LEVEL];
	u64 bad_mt_xwr;

	/*
	* The pkru_mask indicates if protection key checks are needed.  It
	* consists of 16 domains indexed by page fault error code bits [4:1],
	* with PFEC.RSVD replaced by ACC_USER_MASK from the page tables.
	* Each domain has 2 bits which are ANDed with AD and WD from PKRU.
	*/
	u32 pkru_mask;

	/*
	 * Bitmap; bit set = permission fault
	 * Array index: page fault error code [4:1]
	 * Bit index: pte permissions in ACC_* format
	 */
	u16 permissions[16];
};

struct kvm_mmu_root_info {
	gpa_t pgd;
	hpa_t hpa;
};

#define KVM_MMU_ROOT_INFO_INVALID \
	((struct kvm_mmu_root_info) { .pgd = INVALID_PAGE, .hpa = INVALID_PAGE })

#define KVM_MMU_NUM_PREV_ROOTS 3

#define KVM_MMU_ROOT_CURRENT		BIT(0)
#define KVM_MMU_ROOT_PREVIOUS(i)	BIT(1+i)
#define KVM_MMU_ROOTS_ALL		(BIT(1 + KVM_MMU_NUM_PREV_ROOTS) - 1)

#define KVM_HAVE_MMU_RWLOCK

struct kvm_mmu_page;
struct kvm_page_fault;

/*
 * x86 supports 4 paging modes (5-level 64-bit, 4-level 64-bit, 3-level 32-bit,
 * and 2-level 32-bit).  The kvm_pagewalk structure abstracts the details of the
 * current mmu mode.
 */
struct kvm_pagewalk {
	unsigned long (*get_guest_pgd)(struct kvm_vcpu *vcpu);
	u64 (*get_pdptr)(struct kvm_vcpu *vcpu, int index);
	void (*inject_page_fault)(struct kvm_vcpu *vcpu,
				  struct x86_exception *fault,
				  bool from_hardware);
	gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_pagewalk *w,
			    gpa_t gva_or_gpa, u64 access,
			    struct x86_exception *exception);

	union kvm_cpu_role cpu_role;
	struct kvm_page_format fmt;
};

struct kvm_mmu {
	int (*page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);
	int (*sync_spte)(struct kvm_vcpu *vcpu,
			 struct kvm_mmu_page *sp, int i);
	struct kvm_pagewalk *w;

	struct kvm_mmu_root_info root;
	hpa_t mirror_root_hpa;
	union kvm_mmu_page_role root_role;

	struct kvm_mmu_root_info prev_roots[KVM_MMU_NUM_PREV_ROOTS];

	u64 *pae_root;
	u64 *pml4_root;
	u64 *pml5_root;

	/*
	 * check zero bits on shadow page table entries, these
	 * bits include not only hardware reserved bits but also
	 * the bits spte never used.
	 */
	struct kvm_page_format fmt;
};

enum pmc_type {
	KVM_PMC_GP = 0,
	KVM_PMC_FIXED,
};

struct kvm_pmc {
	enum pmc_type type;
	u8 idx;
	bool is_paused;
	bool intr;
	/*
	 * Base value of the PMC counter, relative to the *consumed* count in
	 * the associated perf_event.  This value includes counter updates from
	 * the perf_event and emulated_count since the last time the counter
	 * was reprogrammed, but it is *not* the current value as seen by the
	 * guest or userspace.
	 *
	 * The count is relative to the associated perf_event so that KVM
	 * doesn't need to reprogram the perf_event every time the guest writes
	 * to the counter.
	 */
	u64 counter;
	/*
	 * PMC events triggered by KVM emulation that haven't been fully
	 * processed, i.e. haven't undergone overflow detection.
	 */
	u64 emulated_counter;
	u64 eventsel;
	u64 eventsel_hw;
	struct perf_event *perf_event;
	struct kvm_vcpu *vcpu;
	/*
	 * only for creating or reusing perf_event,
	 * eventsel value for general purpose counters,
	 * ctrl value for fixed counters.
	 */
	u64 current_config;
};

/* More counters may conflict with other existing Architectural MSRs */
#define KVM_MAX(a, b)	((a) >= (b) ? (a) : (b))
#define KVM_MAX_NR_INTEL_GP_COUNTERS	8
#define KVM_MAX_NR_AMD_GP_COUNTERS	6
#define KVM_MAX_NR_GP_COUNTERS		KVM_MAX(KVM_MAX_NR_INTEL_GP_COUNTERS, \
						KVM_MAX_NR_AMD_GP_COUNTERS)

#define KVM_MAX_NR_INTEL_FIXED_COUNTERS	3
#define KVM_MAX_NR_AMD_FIXED_COUNTERS	0
#define KVM_MAX_NR_FIXED_COUNTERS	KVM_MAX(KVM_MAX_NR_INTEL_FIXED_COUNTERS, \
						KVM_MAX_NR_AMD_FIXED_COUNTERS)

struct kvm_pmu {
	u8 version;
	unsigned nr_arch_gp_counters;
	unsigned nr_arch_fixed_counters;
	unsigned available_event_types;
	u64 fixed_ctr_ctrl;
	u64 fixed_ctr_ctrl_hw;
	u64 fixed_ctr_ctrl_rsvd;
	u64 global_ctrl;
	u64 global_status;
	u64 counter_bitmask[2];
	u64 global_ctrl_rsvd;
	u64 global_status_rsvd;
	u64 reserved_bits;
	u64 raw_event_mask;
	struct kvm_pmc gp_counters[KVM_MAX_NR_GP_COUNTERS];
	struct kvm_pmc fixed_counters[KVM_MAX_NR_FIXED_COUNTERS];

	/*
	 * Overlay the bitmap with a 64-bit atomic so that all bits can be
	 * set in a single access, e.g. to reprogram all counters when the PMU
	 * filter changes.
	 */
	union {
		DECLARE_BITMAP(reprogram_pmi, X86_PMC_IDX_MAX);
		atomic64_t __reprogram_pmi;
	};
	DECLARE_BITMAP(all_valid_pmc_idx, X86_PMC_IDX_MAX);
	DECLARE_BITMAP(pmc_in_use, X86_PMC_IDX_MAX);

	DECLARE_BITMAP(pmc_counting_instructions, X86_PMC_IDX_MAX);
	DECLARE_BITMAP(pmc_counting_branches, X86_PMC_IDX_MAX);

	DECLARE_BITMAP(pmc_has_mode_specific_enables, X86_PMC_IDX_MAX);

	u64 ds_area;
	u64 pebs_enable;
	u64 pebs_enable_rsvd;
	u64 pebs_data_cfg;
	u64 pebs_data_cfg_rsvd;

	/*
	 * If a guest counter is cross-mapped to host counter with different
	 * index, its PEBS capability will be temporarily disabled.
	 *
	 * The user should make sure that this mask is updated
	 * after disabling interrupts and before perf_guest_get_msrs();
	 */
	u64 host_cross_mapped_mask;

	/*
	 * The gate to release perf_events not marked in
	 * pmc_in_use only once in a vcpu time slice.
	 */
	bool need_cleanup;

	/*
	 * The total number of programmed perf_events and it helps to avoid
	 * redundant check before cleanup if guest don't use vPMU at all.
	 */
	u8 event_count;
};

struct kvm_pmu_ops;

enum {
	KVM_DEBUGREG_BP_ENABLED		= BIT(0),
	KVM_DEBUGREG_WONT_EXIT		= BIT(1),
	/*
	 * Guest debug registers (DR0-3, DR6 and DR7) are saved/restored by
	 * hardware on exit from or enter to guest. KVM needn't switch them.
	 * DR0-3, DR6 and DR7 are set to their architectural INIT value on VM
	 * exit, host values need to be restored.
	 */
	KVM_DEBUGREG_AUTO_SWITCH	= BIT(2),
};

struct kvm_mtrr {
	u64 var[KVM_NR_VAR_MTRR * 2];
	u64 fixed_64k;
	u64 fixed_16k[2];
	u64 fixed_4k[8];
	u64 deftype;
};

struct kvm_hypervisor_cpuid {
	u32 base;
	u32 limit;
};

#ifdef CONFIG_KVM_XEN
/* Xen HVM per vcpu emulation context */
struct kvm_vcpu_xen {
	u64 hypercall_rip;
	u32 current_runstate;
	u8 upcall_vector;
	struct gfn_to_pfn_cache vcpu_info_cache;
	struct gfn_to_pfn_cache vcpu_time_info_cache;
	struct gfn_to_pfn_cache runstate_cache;
	struct gfn_to_pfn_cache runstate2_cache;
	u64 last_steal;
	u64 runstate_entry_time;
	u64 runstate_times[4];
	unsigned long evtchn_pending_sel;
	u32 vcpu_id; /* The Xen / ACPI vCPU ID */
	u32 timer_virq;
	u64 timer_expires; /* In guest epoch */
	atomic_t timer_pending;
	struct hrtimer timer;
	int poll_evtchn;
	struct timer_list poll_timer;
	struct kvm_hypervisor_cpuid cpuid;
};
#endif

struct kvm_vcpu_hv;

struct kvm_queued_exception {
	bool pending;
	bool injected;
	bool has_error_code;
	u8 vector;
	u32 error_code;
	unsigned long payload;
	bool has_payload;
};

/*
 * Hardware-defined CPUID leafs that are either scattered by the kernel or are
 * unknown to the kernel, but need to be directly used by KVM.  Note, these
 * word values conflict with the kernel's "bug" caps, but KVM doesn't use those.
 */
enum kvm_only_cpuid_leafs {
	CPUID_12_EAX	 = NCAPINTS,
	CPUID_7_1_EDX,
	CPUID_8000_0007_EDX,
	CPUID_8000_0022_EAX,
	CPUID_7_2_EDX,
	CPUID_24_0_EBX,
	CPUID_8000_0021_ECX,
	CPUID_7_1_ECX,
	CPUID_1E_1_EAX,
	CPUID_24_1_ECX,
	NR_KVM_CPU_CAPS,

	NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS,
};

struct kvm_vcpu_arch {
	/*
	 * rip and regs accesses must go through
	 * kvm_{register,rip}_{read,write} functions.
	 */
	unsigned long regs[NR_VCPU_GENERAL_PURPOSE_REGS];
	unsigned long rip;
	DECLARE_BITMAP(regs_avail, NR_VCPU_TOTAL_REGS);
	DECLARE_BITMAP(regs_dirty, NR_VCPU_TOTAL_REGS);

	unsigned long cr0;
	unsigned long cr0_guest_owned_bits;
	unsigned long cr2;
	unsigned long cr3;
	unsigned long cr4;
	unsigned long cr4_guest_owned_bits;
	unsigned long cr4_guest_rsvd_bits;
	unsigned long cr8;
	u32 host_pkru;
	u32 pkru;
	u32 hflags;
	u64 efer;
	u64 host_debugctl;
	u64 apic_base;
	struct kvm_lapic *apic;    /* kernel irqchip context */
	bool load_eoi_exitmap_pending;
	DECLARE_BITMAP(ioapic_handled_vectors, 256);
	unsigned long apic_attention;
	int32_t apic_arb_prio;
	int mp_state;
	u64 ia32_misc_enable_msr;
	u64 smbase;
	u64 smi_count;
	bool at_instruction_boundary;
	bool tpr_access_reporting;
	bool xfd_no_write_intercept;
	u64 microcode_version;
	u64 arch_capabilities;
	u64 perf_capabilities;

	/*
	 * Paging state of the vcpu
	 *
	 * If the vcpu runs in guest mode with two level paging this still saves
	 * the paging mode of the l1 guest. This context is always used to
	 * handle faults.
	 */
	struct kvm_mmu *mmu;

	/* Non-nested MMU for L1 */
	struct kvm_mmu root_mmu;

	/* L1 TDP when running nested */
	struct kvm_mmu guest_mmu;
	struct kvm_pagewalk ngpa_walk;

	/*
	 * Pagewalk context used for gva_to_gpa translations.
	 */
	struct kvm_pagewalk gva_walk;

	u64 pdptrs[4]; /* pae */

	struct kvm_mmu_memory_cache mmu_pte_list_desc_cache;
	struct kvm_mmu_memory_cache mmu_shadow_page_cache;
	struct kvm_mmu_memory_cache mmu_shadowed_info_cache;
	struct kvm_mmu_memory_cache mmu_page_header_cache;
	/*
	 * This cache is to allocate external page table. E.g. private EPT used
	 * by the TDX module.
	 */
	struct kvm_mmu_memory_cache mmu_external_spt_cache;

	/*
	 * QEMU userspace and the guest each have their own FPU state.
	 * In vcpu_run, we switch between the user and guest FPU contexts.
	 * While running a VCPU, the VCPU thread will have the guest FPU
	 * context.
	 *
	 * Note that while the PKRU state lives inside the fpu registers,
	 * it is switched out separately at VMENTER and VMEXIT time. The
	 * "guest_fpstate" state here contains the guest FPU context, with the
	 * host PRKU bits.
	 */
	struct fpu_guest guest_fpu;

	u64 xcr0;
	u64 guest_supported_xcr0;
	u64 ia32_xss;
	u64 guest_supported_xss;

	struct kvm_pio_request pio;
	void *pio_data;
	void *sev_pio_data;
	unsigned sev_pio_count;

	u8 event_exit_inst_len;

	bool exception_from_userspace;

	/* Exceptions to be injected to the guest. */
	struct kvm_queued_exception exception;
	/* Exception VM-Exits to be synthesized to L1. */
	struct kvm_queued_exception exception_vmexit;

	struct kvm_queued_interrupt {
		bool injected;
		bool soft;
		u8 nr;
	} interrupt;

	int halt_request; /* real mode on Intel only */

	int cpuid_nent;
	struct kvm_cpuid_entry2 *cpuid_entries;
	bool cpuid_dynamic_bits_dirty;
	bool is_amd_compatible;

	/*
	 * cpu_caps holds the effective guest capabilities, i.e. the features
	 * the vCPU is allowed to use.  Typically, but not always, features can
	 * be used by the guest if and only if both KVM and userspace want to
	 * expose the feature to the guest.
	 *
	 * A common exception is for virtualization holes, i.e. when KVM can't
	 * prevent the guest from using a feature, in which case the vCPU "has"
	 * the feature regardless of what KVM or userspace desires.
	 *
	 * Note, features that don't require KVM involvement in any way are
	 * NOT enforced/sanitized by KVM, i.e. are taken verbatim from the
	 * guest CPUID provided by userspace.
	 */
	u32 cpu_caps[NR_KVM_CPU_CAPS];

	u64 reserved_gpa_bits;
	int maxphyaddr;

	/* emulate context */

	struct x86_emulate_ctxt *emulate_ctxt;
	bool emulate_regs_need_sync_to_vcpu;
	bool emulate_regs_need_sync_from_vcpu;
	int (*complete_userspace_io)(struct kvm_vcpu *vcpu);
	unsigned long cui_linear_rip;
	int cui_rdmsr_imm_reg;

	gpa_t time;
	s8  pvclock_tsc_shift;
	u32 pvclock_tsc_mul;
	unsigned int hw_tsc_khz;
	struct gfn_to_pfn_cache pv_time;
	/* set guest stopped flag in pvclock flags field */
	bool pvclock_set_guest_stopped_request;

	struct {
		u8 preempted;
		u64 msr_val;
		u64 last_steal;
		struct gfn_to_hva_cache cache;
	} st;

	u64 l1_tsc_offset;
	u64 tsc_offset; /* current tsc offset */
	u64 last_guest_tsc;
	u64 last_host_tsc;
	u64 tsc_offset_adjustment;
	u64 this_tsc_nsec;
	u64 this_tsc_write;
	u64 this_tsc_generation;
	bool tsc_catchup;
	bool tsc_always_catchup;
	s8 virtual_tsc_shift;
	u32 virtual_tsc_mult;
	u32 virtual_tsc_khz;
	s64 ia32_tsc_adjust_msr;
	u64 msr_ia32_power_ctl;
	u64 l1_tsc_scaling_ratio;
	u64 tsc_scaling_ratio; /* current scaling ratio */

	atomic_t nmi_queued;  /* unprocessed asynchronous NMIs */
	/* Number of NMIs pending injection, not including hardware vNMIs. */
	unsigned int nmi_pending;
	bool nmi_injected;    /* Trying to inject an NMI this entry */
	bool smi_pending;    /* SMI queued after currently running handler */
	u8 handling_intr_from_guest;

	struct kvm_mtrr mtrr_state;
	u64 pat;

	unsigned switch_db_regs;
	unsigned long db[KVM_NR_DB_REGS];
	unsigned long dr6;
	unsigned long dr7;
	unsigned long eff_db[KVM_NR_DB_REGS];
	unsigned long guest_debug_dr7;
	u64 msr_platform_info;
	u64 msr_misc_features_enables;

	u64 mcg_cap;
	u64 mcg_status;
	u64 mcg_ctl;
	u64 mcg_ext_ctl;
	u64 *mce_banks;
	u64 *mci_ctl2_banks;

	/* Cache MMIO info */
	u64 mmio_gva;
	unsigned mmio_access;
	gfn_t mmio_gfn;
	u64 mmio_gen;

	struct kvm_pmu pmu;

	/* used for guest single stepping over the given code position */
	unsigned long singlestep_rip;

#ifdef CONFIG_KVM_HYPERV
	bool hyperv_enabled;
	struct kvm_vcpu_hv *hyperv;
#endif
#ifdef CONFIG_KVM_XEN
	struct kvm_vcpu_xen xen;
#endif
	cpumask_var_t wbinvd_dirty_mask;

	unsigned long last_retry_eip;
	unsigned long last_retry_addr;

	struct {
		bool halted;
		gfn_t gfns[ASYNC_PF_PER_VCPU];
		struct gfn_to_hva_cache data;
		u64 msr_en_val; /* MSR_KVM_ASYNC_PF_EN */
		u64 msr_int_val; /* MSR_KVM_ASYNC_PF_INT */
		u16 vec;
		u32 id;
		u32 host_apf_flags;
		bool pageready_pending;
	} apf;

	/* OSVW MSRs (AMD only) */
	struct {
		u64 length;
		u64 status;
	} osvw;

	struct {
		u64 msr_val;
		struct gfn_to_hva_cache data;
	} pv_eoi;

	u64 msr_kvm_poll_control;

	/* pv related host specific info */
	struct {
		bool pv_unhalted;
	} pv;

	int pending_ioapic_eoi;
	int pending_external_vector;
	int highest_stale_pending_ioapic_eoi;

	/* be preempted when it's in kernel-mode(cpl=0) */
	bool preempted_in_kernel;

	/* Host CPU on which VM-entry was most recently attempted */
	int last_vmentry_cpu;

	/* AMD MSRC001_0015 Hardware Configuration */
	u64 msr_hwcr;

	/* pv related cpuid info */
	struct {
		/*
		 * value of the eax register in the KVM_CPUID_FEATURES CPUID
		 * leaf.
		 */
		u32 features;

		/*
		 * indicates whether pv emulation should be disabled if features
		 * are not present in the guest's cpuid
		 */
		bool enforce;
	} pv_cpuid;

	/* Protected Guests */
	bool guest_state_protected;
	bool guest_tsc_protected;

	/*
	 * Set when PDPTS were loaded directly by the userspace without
	 * reading the guest memory
	 */
	bool pdptrs_from_userspace;

	/*
	 * Set if an emulated nested VM-Enter to L2 is pending completion.  KVM
	 * must not synthesize a VM-Exit to L1 before entering L2, as VM-Exits
	 * can only occur at instruction boundaries.  The only exception is
	 * VMX's "notify" exits, which exist in large part to break the CPU out
	 * of infinite ucode loops, but can corrupt vCPU state in the process!
	 *
	 * For all intents and purposes, this is a boolean, but it's tracked as
	 * a u8 so that KVM can detect when userspace may have stuffed vCPU
	 * state and generated an architecturally-impossible VM-Exit.
	 */
#define KVM_NESTED_RUN_PENDING			1
#define KVM_NESTED_RUN_PENDING_UNTRUSTED	2
	u8 nested_run_pending;

#if IS_ENABLED(CONFIG_HYPERV)
	hpa_t hv_root_tdp;
#endif
};

struct kvm_lpage_info {
	int disallow_lpage;
};

struct kvm_arch_memory_slot {
	struct kvm_rmap_head *rmap[KVM_NR_PAGE_SIZES];
	struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
	unsigned short *gfn_write_track;
};

/* Hyper-V synthetic debugger (SynDbg)*/
struct kvm_hv_syndbg {
	struct {
		u64 control;
		u64 status;
		u64 send_page;
		u64 recv_page;
		u64 pending_page;
	} control;
	u64 options;
};

/* Current state of Hyper-V TSC page clocksource */
enum hv_tsc_page_status {
	/* TSC page was not set up or disabled */
	HV_TSC_PAGE_UNSET = 0,
	/* TSC page MSR was written by the guest, update pending */
	HV_TSC_PAGE_GUEST_CHANGED,
	/* TSC page update was triggered from the host side */
	HV_TSC_PAGE_HOST_CHANGED,
	/* TSC page was properly set up and is currently active  */
	HV_TSC_PAGE_SET,
	/* TSC page was set up with an inaccessible GPA */
	HV_TSC_PAGE_BROKEN,
};

#ifdef CONFIG_KVM_HYPERV
/* Hyper-V emulation context */
struct kvm_hv {
	struct mutex hv_lock;
	u64 hv_guest_os_id;
	u64 hv_hypercall;
	u64 hv_tsc_page;
	enum hv_tsc_page_status hv_tsc_page_status;

	/* Hyper-v based guest crash (NT kernel bugcheck) parameters */
	u64 hv_crash_param[HV_X64_MSR_CRASH_PARAMS];
	u64 hv_crash_ctl;

	struct ms_hyperv_tsc_page tsc_ref;

	struct idr conn_to_evt;

	u64 hv_reenlightenment_control;
	u64 hv_tsc_emulation_control;
	u64 hv_tsc_emulation_status;
	u64 hv_invtsc_control;

	/* How many vCPUs have VP index != vCPU index */
	atomic_t num_mismatched_vp_indexes;

	/*
	 * How many SynICs use 'AutoEOI' feature
	 * (protected by arch.apicv_update_lock)
	 */
	unsigned int synic_auto_eoi_used;

	struct kvm_hv_syndbg hv_syndbg;

	bool xsaves_xsavec_checked;
};
#endif

#ifdef CONFIG_KVM_XEN
/* Xen emulation context */
struct kvm_xen {
	struct mutex xen_lock;
	u32 xen_version;
	bool long_mode;
	bool runstate_update_flag;
	u8 upcall_vector;
	struct gfn_to_pfn_cache shinfo_cache;
	struct idr evtchn_ports;
	unsigned long poll_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];

	struct kvm_xen_hvm_config hvm_config;
};
#endif

enum kvm_irqchip_mode {
	KVM_IRQCHIP_NONE,
#ifdef CONFIG_KVM_IOAPIC
	KVM_IRQCHIP_KERNEL,       /* created with KVM_CREATE_IRQCHIP */
#endif
	KVM_IRQCHIP_SPLIT,        /* created with KVM_CAP_SPLIT_IRQCHIP */
};

enum kvm_suppress_eoi_broadcast_mode {
	KVM_SUPPRESS_EOI_BROADCAST_QUIRKED, /* Legacy behavior */
	KVM_SUPPRESS_EOI_BROADCAST_ENABLED, /* Enable Suppress EOI broadcast */
	KVM_SUPPRESS_EOI_BROADCAST_DISABLED /* Disable Suppress EOI broadcast */
};

struct kvm_possible_nx_huge_pages {
	/*
	 * A list of kvm_mmu_page structs that, if zapped, could possibly be
	 * replaced by an NX huge page.  A shadow page is on this list if its
	 * existence disallows an NX huge page (nx_huge_page_disallowed is set)
	 * and there are no other conditions that prevent a huge page, e.g.
	 * the backing host page is huge, dirtly logging is not enabled for its
	 * memslot, etc...  Note, zapping shadow pages on this list doesn't
	 * guarantee an NX huge page will be created in its stead, e.g. if the
	 * guest attempts to execute from the region then KVM obviously can't
	 * create an NX huge page (without hanging the guest).
	 */
	struct list_head pages;
	u64 nr_pages;
};

enum kvm_mmu_type {
	KVM_SHADOW_MMU,
#ifdef CONFIG_X86_64
	KVM_TDP_MMU,
#endif
	KVM_NR_MMU_TYPES,
};

struct kvm_arch {
	unsigned long n_requested_mmu_pages;
	unsigned long n_max_mmu_pages;
	unsigned int indirect_shadow_pages;
	u8 mmu_valid_gen;
	u8 vm_type;
	bool has_private_mem;
	bool has_protected_state;
	bool has_protected_eoi;
	bool has_protected_pmu;
	bool pre_fault_allowed;
	struct hlist_head *mmu_page_hash;
	struct list_head active_mmu_pages;
	struct kvm_possible_nx_huge_pages possible_nx_huge_pages[KVM_NR_MMU_TYPES];
#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING
	struct kvm_page_track_notifier_head track_notifier_head;
#endif
	/*
	 * Protects marking pages unsync during page faults, as TDP MMU page
	 * faults only take mmu_lock for read.  For simplicity, the unsync
	 * pages lock is always taken when marking pages unsync regardless of
	 * whether mmu_lock is held for read or write.
	 */
	spinlock_t mmu_unsync_pages_lock;

	u64 shadow_mmio_value;

#define __KVM_HAVE_ARCH_NONCOHERENT_DMA
	atomic_t noncoherent_dma_count;
	unsigned long nr_possible_bypass_irqs;

#ifdef CONFIG_KVM_IOAPIC
	struct kvm_pic *vpic;
	struct kvm_ioapic *vioapic;
	struct kvm_pit *vpit;
#endif
	atomic_t vapics_in_nmi_mode;

	struct mutex apic_map_lock;
	struct kvm_apic_map __rcu *apic_map;
	atomic_t apic_map_dirty;

	bool apic_access_memslot_enabled;
	bool apic_access_memslot_inhibited;

	/*
	 * Force apicv_update_lock and apicv_nr_irq_window_req to reside in a
	 * dedicated cacheline.  They are write-mostly, whereas most everything
	 * else in kvm_arch is read-mostly.  Note that apicv_inhibit_reasons is
	 * read-mostly: toggling VM-wide inhibits is rare; _checking_ for
	 * inhibits is common.
	 */
	____cacheline_aligned
	/*
	 * Protects apicv_inhibit_reasons and apicv_nr_irq_window_req (with an
	 * asterisk, see kvm_inc_or_dec_irq_window_inhibit() for details).
	 */
	struct rw_semaphore apicv_update_lock;
	atomic_t apicv_nr_irq_window_req;
	____cacheline_aligned

	unsigned long apicv_inhibit_reasons;

	gpa_t wall_clock;

	u64 disabled_exits;

	s64 kvmclock_offset;

	/*
	 * This also protects nr_vcpus_matched_tsc which is read from a
	 * preemption-disabled region, so it must be a raw spinlock.
	 */
	raw_spinlock_t tsc_write_lock;
	u64 last_tsc_nsec;
	u64 last_tsc_write;
	u32 last_tsc_khz;
	u64 last_tsc_offset;
	u64 cur_tsc_nsec;
	u64 cur_tsc_write;
	u64 cur_tsc_offset;
	u64 cur_tsc_generation;
	int nr_vcpus_matched_tsc;

	u32 default_tsc_khz;
	bool user_set_tsc;
	u64 apic_bus_cycle_ns;

	seqcount_raw_spinlock_t pvclock_sc;
	bool use_master_clock;
	u64 master_kernel_ns;
	u64 master_cycle_now;
	struct ratelimit_state kvmclock_update_rs;

#ifdef CONFIG_KVM_HYPERV
	struct kvm_hv hyperv;
#endif

#ifdef CONFIG_KVM_XEN
	struct kvm_xen xen;
#endif

	bool backwards_tsc_observed;
	bool boot_vcpu_runs_old_kvmclock;
	u32 bsp_vcpu_id;

	u64 disabled_quirks;

	enum kvm_irqchip_mode irqchip_mode;
	u8 nr_reserved_ioapic_pins;

	bool disabled_lapic_found;

	bool x2apic_format;
	bool x2apic_broadcast_quirk_disabled;
	enum kvm_suppress_eoi_broadcast_mode suppress_eoi_broadcast_mode;

	bool has_mapped_host_mmio;
	bool guest_can_read_msr_platform_info;
	bool exception_payload_enabled;

	bool triple_fault_event;

	bool bus_lock_detection_enabled;
	bool enable_pmu;
	bool created_mediated_pmu;

	u32 notify_window;
	u32 notify_vmexit_flags;
	/*
	 * If exit_on_emulation_error is set, and the in-kernel instruction
	 * emulator fails to emulate an instruction, allow userspace
	 * the opportunity to look at it.
	 */
	bool exit_on_emulation_error;

	/* Deflect RDMSR and WRMSR to user space when they trigger a #GP */
	u32 user_space_msr_mask;
	struct kvm_x86_msr_filter __rcu *msr_filter;

	u32 hypercall_exit_enabled;

	/* Guest can access the SGX PROVISIONKEY. */
	bool sgx_provisioning_allowed;

	struct kvm_x86_pmu_event_filter __rcu *pmu_event_filter;
	struct vhost_task *nx_huge_page_recovery_thread;
	u64 nx_huge_page_last;
	struct once nx_once;

#ifdef CONFIG_X86_64
#ifdef CONFIG_KVM_PROVE_MMU
	/*
	 * The number of TDP MMU pages across all roots.  Used only to sanity
	 * check that KVM isn't leaking TDP MMU pages.
	 */
	atomic64_t tdp_mmu_pages;
#endif

	/*
	 * List of struct kvm_mmu_pages being used as roots.
	 * All struct kvm_mmu_pages in the list should have
	 * tdp_mmu_page set.
	 *
	 * For reads, this list is protected by:
	 *	RCU alone or
	 *	the MMU lock in read mode + RCU or
	 *	the MMU lock in write mode
	 *
	 * For writes, this list is protected by tdp_mmu_pages_lock; see
	 * below for the details.
	 *
	 * Roots will remain in the list until their tdp_mmu_root_count
	 * drops to zero, at which point the thread that decremented the
	 * count to zero should removed the root from the list and clean
	 * it up, freeing the root after an RCU grace period.
	 */
	struct list_head tdp_mmu_roots;

	/*
	 * Protects accesses to the following fields when the MMU lock
	 * is held in read mode:
	 *  - tdp_mmu_roots (above)
	 *  - the link field of kvm_mmu_page structs used by the TDP MMU
	 *  - possible_nx_huge_pages[KVM_TDP_MMU];
	 *  - the possible_nx_huge_page_link field of kvm_mmu_page structs used
	 *    by the TDP MMU
	 * Because the lock is only taken within the MMU lock, strictly
	 * speaking it is redundant to acquire this lock when the thread
	 * holds the MMU lock in write mode.  However it often simplifies
	 * the code to do so.
	 */
	spinlock_t tdp_mmu_pages_lock;
#endif /* CONFIG_X86_64 */

	/*
	 * If set, at least one shadow root has been allocated. This flag
	 * is used as one input when determining whether certain memslot
	 * related allocations are necessary.
	 */
	bool shadow_root_allocated;

#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING
	/*
	 * If set, the VM has (or had) an external write tracking user, and
	 * thus all write tracking metadata has been allocated, even if KVM
	 * itself isn't using write tracking.
	 */
	bool external_write_tracking_enabled;
#endif

#if IS_ENABLED(CONFIG_HYPERV)
	hpa_t	hv_root_tdp;
	spinlock_t hv_root_tdp_lock;
	struct hv_partition_assist_pg *hv_pa_pg;
#endif
	/*
	 * VM-scope maximum vCPU ID. Used to determine the size of structures
	 * that increase along with the maximum vCPU ID, in which case, using
	 * the global KVM_MAX_VCPU_IDS may lead to significant memory waste.
	 */
	u32 max_vcpu_ids;

	bool disable_nx_huge_pages;

	/*
	 * Memory caches used to allocate shadow pages when performing eager
	 * page splitting. No need for a shadowed_info_cache since eager page
	 * splitting only allocates direct shadow pages.
	 *
	 * Protected by kvm->slots_lock.
	 */
	struct kvm_mmu_memory_cache split_shadow_page_cache;
	struct kvm_mmu_memory_cache split_page_header_cache;

	/*
	 * Memory cache used to allocate pte_list_desc structs while splitting
	 * huge pages. In the worst case, to split one huge page, 512
	 * pte_list_desc structs are needed to add each lower level leaf sptep
	 * to the rmap plus 1 to extend the parent_ptes rmap of the lower level
	 * page table.
	 *
	 * Protected by kvm->slots_lock.
	 */
#define SPLIT_DESC_CACHE_MIN_NR_OBJECTS (SPTE_ENT_PER_PAGE + 1)
	struct kvm_mmu_memory_cache split_desc_cache;

	gfn_t gfn_direct_bits;

	/*
	 * Size of the CPU's dirty log buffer, i.e. VMX's PML buffer. A Zero
	 * value indicates CPU dirty logging is unsupported or disabled in
	 * current VM.
	 */
	int cpu_dirty_log_size;
};

struct kvm_vm_stat {
	struct kvm_vm_stat_generic generic;
	u64 mmu_shadow_zapped;
	u64 mmu_pte_write;
	u64 mmu_pde_zapped;
	u64 mmu_flooded;
	u64 mmu_recycled;
	u64 mmu_cache_miss;
	u64 mmu_unsync;
	u64 mmu_shadow_pages;
	union {
		struct {
			atomic64_t pages_4k;
			atomic64_t pages_2m;
			atomic64_t pages_1g;
		};
		atomic64_t pages[KVM_NR_PAGE_SIZES];
	};
	u64 nx_lpage_splits;
	u64 max_mmu_page_hash_collisions;
	u64 max_mmu_rmap_size;
};

struct kvm_vcpu_stat {
	struct kvm_vcpu_stat_generic generic;
	u64 pf_taken;
	u64 pf_fixed;
	u64 pf_emulate;
	u64 pf_spurious;
	u64 pf_fast;
	u64 pf_mmio_spte_created;
	u64 pf_guest;
	u64 tlb_flush;
	u64 invlpg;

	u64 exits;
	u64 io_exits;
	u64 mmio_exits;
	u64 signal_exits;
	u64 irq_window_exits;
	u64 nmi_window_exits;
	u64 l1d_flush;
	u64 halt_exits;
	u64 request_irq_exits;
	u64 irq_exits;
	u64 host_state_reload;
	u64 fpu_reload;
	u64 insn_emulation;
	u64 insn_emulation_fail;
	u64 hypercalls;
	u64 irq_injections;
	u64 nmi_injections;
	u64 req_event;
	u64 nested_run;
	u64 directed_yield_attempted;
	u64 directed_yield_successful;
	u64 preemption_reported;
	u64 preemption_other;
	u64 guest_mode;
	u64 notify_window_exits;
};

struct x86_instruction_info;

struct msr_data {
	bool host_initiated;
	u32 index;
	u64 data;
};

struct kvm_lapic_irq {
	u32 vector;
	u16 delivery_mode;
	u16 dest_mode;
	bool level;
	u16 trig_mode;
	u32 shorthand;
	u32 dest_id;
	bool msi_redir_hint;
};

enum kvm_x86_run_flags {
	KVM_RUN_FORCE_IMMEDIATE_EXIT	= BIT(0),
	KVM_RUN_LOAD_GUEST_DR6		= BIT(1),
	KVM_RUN_LOAD_DEBUGCTL		= BIT(2),
};

struct kvm_x86_ops {
	const char *name;

	int (*check_processor_compatibility)(void);

	int (*enable_virtualization_cpu)(void);
	void (*disable_virtualization_cpu)(void);
	cpu_emergency_virt_cb *emergency_disable_virtualization_cpu;

	void (*hardware_unsetup)(void);
	bool (*has_emulated_msr)(struct kvm *kvm, u32 index);
	void (*vcpu_after_set_cpuid)(struct kvm_vcpu *vcpu);

	unsigned int vm_size;
	int (*vm_init)(struct kvm *kvm);
	void (*vm_destroy)(struct kvm *kvm);
	void (*vm_pre_destroy)(struct kvm *kvm);

	/* Create, but do not attach this VCPU */
	int (*vcpu_precreate)(struct kvm *kvm);
	int (*vcpu_create)(struct kvm_vcpu *vcpu);
	void (*vcpu_free)(struct kvm_vcpu *vcpu);
	void (*vcpu_reset)(struct kvm_vcpu *vcpu, bool init_event);

	void (*prepare_switch_to_guest)(struct kvm_vcpu *vcpu);
	void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
	void (*vcpu_put)(struct kvm_vcpu *vcpu);

	/*
	 * Mask of DEBUGCTL bits that are owned by the host, i.e. that need to
	 * match the host's value even while the guest is active.
	 */
	const u64 HOST_OWNED_DEBUGCTL;

	void (*update_exception_bitmap)(struct kvm_vcpu *vcpu);
	int (*get_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
	int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
	u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
	void (*get_segment)(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg);
	int (*get_cpl)(struct kvm_vcpu *vcpu);
	int (*get_cpl_no_cache)(struct kvm_vcpu *vcpu);
	void (*set_segment)(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg);
	void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
	bool (*is_valid_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
	void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
	void (*post_set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
	bool (*is_valid_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
	void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
	int (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
	void (*get_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
	void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
	void (*get_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
	void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
	void (*sync_dirty_debug_regs)(struct kvm_vcpu *vcpu);
	void (*set_dr7)(struct kvm_vcpu *vcpu, unsigned long value);
	void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
	unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
	void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
	bool (*get_if_flag)(struct kvm_vcpu *vcpu);

	void (*flush_tlb_all)(struct kvm_vcpu *vcpu);
	void (*flush_tlb_current)(struct kvm_vcpu *vcpu);
#if IS_ENABLED(CONFIG_HYPERV)
	int  (*flush_remote_tlbs)(struct kvm *kvm);
	int  (*flush_remote_tlbs_range)(struct kvm *kvm, gfn_t gfn,
					gfn_t nr_pages);
#endif

	/*
	 * Flush any TLB entries associated with the given GVA.
	 * Does not need to flush GPA->HPA mappings.
	 * Can potentially get non-canonical addresses through INVLPGs, which
	 * the implementation may choose to ignore if appropriate.
	 */
	void (*flush_tlb_gva)(struct kvm_vcpu *vcpu, gva_t addr, bool *full);

	/*
	 * Flush any TLB entries created by the guest.  Like tlb_flush_gva(),
	 * does not need to flush GPA->HPA mappings.
	 */
	void (*flush_tlb_guest)(struct kvm_vcpu *vcpu);

	bool (*vcpu_needs_initialization)(struct kvm_vcpu *vcpu);
	enum exit_fastpath_completion (*vcpu_run)(struct kvm_vcpu *vcpu,
						  u64 run_flags);
	int (*handle_exit)(struct kvm_vcpu *vcpu,
		enum exit_fastpath_completion exit_fastpath);
	int (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
	void (*update_emulated_instruction)(struct kvm_vcpu *vcpu);
	bool (*unhandleable_emulation_required)(struct kvm_vcpu *vcpu);

	void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
	u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu);
	void (*patch_hypercall)(struct kvm_vcpu *vcpu,
				unsigned char *hypercall_addr);
	void (*inject_irq)(struct kvm_vcpu *vcpu, bool reinjected);
	void (*inject_nmi)(struct kvm_vcpu *vcpu);
	void (*inject_exception)(struct kvm_vcpu *vcpu);
	void (*cancel_injection)(struct kvm_vcpu *vcpu);
	int (*interrupt_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
	int (*nmi_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
	bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
	void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
	/* Whether or not a virtual NMI is pending in hardware. */
	bool (*is_vnmi_pending)(struct kvm_vcpu *vcpu);
	/*
	 * Attempt to pend a virtual NMI in hardware.  Returns %true on success
	 * to allow using static_call_ret0 as the fallback.
	 */
	bool (*set_vnmi_pending)(struct kvm_vcpu *vcpu);
	void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
	void (*enable_irq_window)(struct kvm_vcpu *vcpu);
	void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);

	const bool x2apic_icr_is_split;
	const unsigned long required_apicv_inhibits;
	bool allow_apicv_in_x2apic_without_x2apic_virtualization;
	void (*refresh_apicv_exec_ctrl)(struct kvm_vcpu *vcpu);
	void (*hwapic_isr_update)(struct kvm_vcpu *vcpu, int isr);
	void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
	void (*set_virtual_apic_mode)(struct kvm_vcpu *vcpu);
	void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu);
	void (*deliver_interrupt)(struct kvm_lapic *apic, int delivery_mode,
				  int trig_mode, int vector);
	int (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
	int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
	int (*set_identity_map_addr)(struct kvm *kvm, u64 ident_addr);
	u8 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
	bool (*tdp_has_smep)(struct kvm *kvm);

	void (*load_mmu_pgd)(struct kvm_vcpu *vcpu, hpa_t root_hpa,
			     int root_level);

	/* Update the external page table from spte getting set. */
	int (*set_external_spte)(struct kvm *kvm, gfn_t gfn, u64 old_spte,
				 u64 new_spte, enum pg_level level);

	/* Update external page tables for page table about to be freed. */
	void (*free_external_spt)(struct kvm *kvm, struct kvm_mmu_page *sp);


	bool (*has_wbinvd_exit)(void);

	u64 (*get_l2_tsc_offset)(struct kvm_vcpu *vcpu);
	u64 (*get_l2_tsc_multiplier)(struct kvm_vcpu *vcpu);
	void (*write_tsc_offset)(struct kvm_vcpu *vcpu);
	void (*write_tsc_multiplier)(struct kvm_vcpu *vcpu);

	/*
	 * Retrieve somewhat arbitrary exit/entry information.  Intended to
	 * be used only from within tracepoints or error paths.
	 */
	void (*get_exit_info)(struct kvm_vcpu *vcpu, u32 *reason,
			      u64 *info1, u64 *info2,
			      u32 *intr_info, u32 *error_code);

	void (*get_entry_info)(struct kvm_vcpu *vcpu,
			       u32 *intr_info, u32 *error_code);

	int (*check_intercept)(struct kvm_vcpu *vcpu,
			       struct x86_instruction_info *info,
			       enum x86_intercept_stage stage,
			       struct x86_exception *exception);
	void (*handle_exit_irqoff)(struct kvm_vcpu *vcpu);

	void (*update_cpu_dirty_logging)(struct kvm_vcpu *vcpu);

	void (*vcpu_blocking)(struct kvm_vcpu *vcpu);
	void (*vcpu_unblocking)(struct kvm_vcpu *vcpu);

	int (*pi_update_irte)(struct kvm_kernel_irqfd *irqfd, struct kvm *kvm,
			      unsigned int host_irq, uint32_t guest_irq,
			      struct kvm_vcpu *vcpu, u32 vector);
	void (*pi_start_bypass)(struct kvm *kvm);
	void (*apicv_pre_state_restore)(struct kvm_vcpu *vcpu);
	void (*apicv_post_state_restore)(struct kvm_vcpu *vcpu);
	bool (*dy_apicv_has_pending_interrupt)(struct kvm_vcpu *vcpu);
	bool (*protected_apic_has_interrupt)(struct kvm_vcpu *vcpu);

	int (*set_hv_timer)(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc,
			    bool *expired);
	void (*cancel_hv_timer)(struct kvm_vcpu *vcpu);

	void (*setup_mce)(struct kvm_vcpu *vcpu);

#ifdef CONFIG_KVM_SMM
	int (*smi_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
	int (*enter_smm)(struct kvm_vcpu *vcpu, union kvm_smram *smram);
	int (*leave_smm)(struct kvm_vcpu *vcpu, const union kvm_smram *smram);
	void (*enable_smi_window)(struct kvm_vcpu *vcpu);
#endif

	int (*dev_get_attr)(u32 group, u64 attr, u64 *val);
	int (*mem_enc_ioctl)(struct kvm *kvm, void __user *argp);
	int (*vcpu_mem_enc_ioctl)(struct kvm_vcpu *vcpu, void __user *argp);
	int (*vcpu_mem_enc_unlocked_ioctl)(struct kvm_vcpu *vcpu, void __user *argp);
	int (*mem_enc_register_region)(struct kvm *kvm, struct kvm_enc_region *argp);
	int (*mem_enc_unregister_region)(struct kvm *kvm, struct kvm_enc_region *argp);
	int (*vm_copy_enc_context_from)(struct kvm *kvm, unsigned int source_fd);
	int (*vm_move_enc_context_from)(struct kvm *kvm, unsigned int source_fd);
	void (*guest_memory_reclaimed)(struct kvm *kvm);
	void (*reload_vmsa)(struct kvm_vcpu *vcpu);

	int (*get_feature_msr)(u32 msr, u64 *data);

	int (*check_emulate_instruction)(struct kvm_vcpu *vcpu, int emul_type,
					 void *insn, int insn_len);

	bool (*apic_init_signal_blocked)(struct kvm_vcpu *vcpu);
	int (*enable_l2_tlb_flush)(struct kvm_vcpu *vcpu);

	void (*migrate_timers)(struct kvm_vcpu *vcpu);
	void (*recalc_intercepts)(struct kvm_vcpu *vcpu);
	int (*complete_emulated_msr)(struct kvm_vcpu *vcpu, int err);

	void (*vcpu_deliver_sipi_vector)(struct kvm_vcpu *vcpu, u8 vector);

	/*
	 * Returns vCPU specific APICv inhibit reasons
	 */
	unsigned long (*vcpu_get_apicv_inhibit_reasons)(struct kvm_vcpu *vcpu);

	gva_t (*get_untagged_addr)(struct kvm_vcpu *vcpu, gva_t gva, unsigned int flags);
	void *(*alloc_apic_backing_page)(struct kvm_vcpu *vcpu);
#ifdef CONFIG_HAVE_KVM_ARCH_GMEM_CONVERT
	int (*gmem_make_private)(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn,
				 kvm_pfn_t nr_pages);
#endif
#ifdef CONFIG_HAVE_KVM_ARCH_GMEM_RECLAIM
	void (*gmem_make_shared)(kvm_pfn_t pfn, kvm_pfn_t nr_pages);
#endif
#ifdef CONFIG_HAVE_KVM_ARCH_GMEM_INVALIDATE
	void (*gmem_invalidate_range)(struct kvm *kvm, struct kvm_gfn_range *range);
#endif
	int (*gmem_max_mapping_level)(struct kvm *kvm, kvm_pfn_t pfn, bool is_private);
};

struct kvm_x86_nested_ops {
	bool enabled;

	void (*leave_nested)(struct kvm_vcpu *vcpu);
	bool (*is_exception_vmexit)(struct kvm_vcpu *vcpu, u8 vector,
				    u32 error_code);
	int (*check_events)(struct kvm_vcpu *vcpu);
	bool (*has_events)(struct kvm_vcpu *vcpu, bool for_injection);
	void (*triple_fault)(struct kvm_vcpu *vcpu);
	int (*get_state)(struct kvm_vcpu *vcpu,
			 struct kvm_nested_state __user *user_kvm_nested_state,
			 unsigned user_data_size);
	int (*set_state)(struct kvm_vcpu *vcpu,
			 struct kvm_nested_state __user *user_kvm_nested_state,
			 struct kvm_nested_state *kvm_state);
	bool (*get_nested_state_pages)(struct kvm_vcpu *vcpu);
	int (*write_log_dirty)(struct kvm_vcpu *vcpu, gpa_t l2_gpa);
	gpa_t (*translate_nested_gpa)(struct kvm_vcpu *vcpu, gpa_t gpa,
				      u64 access,
				      struct x86_exception *exception,
				      u64 pte_access);

	int (*enable_evmcs)(struct kvm_vcpu *vcpu,
			    uint16_t *vmcs_version);
	uint16_t (*get_evmcs_version)(struct kvm_vcpu *vcpu);
	void (*hv_inject_synthetic_vmexit_post_tlb_flush)(struct kvm_vcpu *vcpu);
};

struct kvm_x86_init_ops {
	int (*hardware_setup)(void);
	unsigned int (*handle_intel_pt_intr)(void);

	struct kvm_x86_ops *runtime_ops;
	struct kvm_pmu_ops *pmu_ops;
	struct kvm_x86_nested_ops *nested_ops;
};

struct kvm_arch_async_pf {
	u32 token;
	gfn_t gfn;
	unsigned long cr3;
	bool direct_map;
	u64 error_code;
};

extern bool __read_mostly allow_smaller_maxphyaddr;
extern bool __read_mostly enable_apicv;
extern bool __read_mostly enable_ipiv;
extern bool __read_mostly enable_device_posted_irqs;
extern struct kvm_x86_ops kvm_x86_ops;
extern struct kvm_x86_nested_ops kvm_nested_ops __read_mostly;

#define kvm_x86_call(func) static_call(kvm_x86_##func)

#define KVM_X86_OP(func) \
	DECLARE_STATIC_CALL(kvm_x86_##func, *(((struct kvm_x86_ops *)0)->func));
#define KVM_X86_OP_OPTIONAL KVM_X86_OP
#define KVM_X86_OP_OPTIONAL_RET0 KVM_X86_OP
#include <asm/kvm-x86-ops.h>

#define kvm_nested_call(func) static_call(kvm_x86_nested_##func)

#define KVM_X86_NESTED_OP(func) \
	DECLARE_STATIC_CALL(kvm_x86_nested_##func, *(((struct kvm_x86_nested_ops *)0)->func));
#define KVM_X86_NESTED_OP_OPTIONAL KVM_X86_NESTED_OP
#define KVM_X86_NESTED_OP_OPTIONAL_RET0 KVM_X86_NESTED_OP
#include <asm/kvm-x86-nested-ops.h>

#define __KVM_HAVE_ARCH_VM_ALLOC
static inline struct kvm *kvm_arch_alloc_vm(void)
{
	return kvzalloc(kvm_x86_ops.vm_size, GFP_KERNEL_ACCOUNT);
}

#define __KVM_HAVE_ARCH_VM_FREE
void kvm_arch_free_vm(struct kvm *kvm);

#if IS_ENABLED(CONFIG_HYPERV)
#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
{
	if (kvm_x86_ops.flush_remote_tlbs &&
	    !kvm_x86_call(flush_remote_tlbs)(kvm))
		return 0;
	else
		return -ENOTSUPP;
}

#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn,
						   u64 nr_pages)
{
	if (!kvm_x86_ops.flush_remote_tlbs_range)
		return -EOPNOTSUPP;

	return kvm_x86_call(flush_remote_tlbs_range)(kvm, gfn, nr_pages);
}
#endif /* CONFIG_HYPERV */

enum kvm_intr_type {
	/* Values are arbitrary, but must be non-zero. */
	KVM_HANDLING_IRQ = 1,
	KVM_HANDLING_NMI,
};

/* Enable perf NMI and timer modes to work, and minimise false positives. */
#define kvm_arch_pmi_in_guest(vcpu) \
	((vcpu) && (vcpu)->arch.handling_intr_from_guest && \
	 (!!in_nmi() == ((vcpu)->arch.handling_intr_from_guest == KVM_HANDLING_NMI)))

#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
#define kvm_arch_has_private_mem(kvm) ((kvm)->arch.has_private_mem)
#endif

#define kvm_arch_has_readonly_mem(kvm) (!(kvm)->arch.has_protected_state)

#ifdef CONFIG_X86_64
static inline unsigned long read_msr(unsigned long msr)
{
	u64 value;

	rdmsrq(msr, value);
	return value;
}
#endif

#define HF_GUEST_MASK		(1 << 0) /* VCPU is in guest-mode */

#ifdef CONFIG_KVM_SMM
#define HF_SMM_MASK		(1 << 1)
#define HF_SMM_INSIDE_NMI_MASK	(1 << 2)

# define KVM_MAX_NR_ADDRESS_SPACES	2
/* SMM is currently unsupported for guests with private memory. */
# define kvm_arch_nr_memslot_as_ids(kvm) (kvm_arch_has_private_mem(kvm) ? 1 : 2)
# define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
#else
# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, 0)
#endif

bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
				     struct kvm_async_pf *work);
void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
				 struct kvm_async_pf *work);
void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
			       struct kvm_async_pf *work);
void kvm_arch_async_page_present_queued(struct kvm_vcpu *vcpu);
bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu);

static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
	kvm_x86_call(vcpu_blocking)(vcpu);
}

static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
{
	kvm_x86_call(vcpu_unblocking)(vcpu);
}

static inline bool kvm_arch_has_irq_bypass(void)
{
	return enable_device_posted_irqs;
}

#endif /* _ASM_X86_KVM_HOST_H */