linux/arch/x86/kvm/mmu/mmu_internal.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __KVM_X86_MMU_INTERNAL_H
#define __KVM_X86_MMU_INTERNAL_H

#include <linux/types.h>
#include <linux/kvm_host.h>
#include <asm/kvm_host.h>

#ifdef CONFIG_KVM_PROVE_MMU
#define KVM_MMU_WARN_ON(x) …
#else
#define KVM_MMU_WARN_ON …
#endif

/* Page table builder macros common to shadow (host) PTEs and guest PTEs. */
#define __PT_BASE_ADDR_MASK …
#define __PT_LEVEL_SHIFT(level, bits_per_level) …
#define __PT_INDEX(address, level, bits_per_level) …

#define __PT_LVL_ADDR_MASK(base_addr_mask, level, bits_per_level) …

#define __PT_LVL_OFFSET_MASK(base_addr_mask, level, bits_per_level) …

#define __PT_ENT_PER_PAGE(bits_per_level) …

/*
 * Unlike regular MMU roots, PAE "roots", a.k.a. PDPTEs/PDPTRs, have a PRESENT
 * bit, and thus are guaranteed to be non-zero when valid.  And, when a guest
 * PDPTR is !PRESENT, its corresponding PAE root cannot be set to INVALID_PAGE,
 * as the CPU would treat that as PRESENT PDPTR with reserved bits set.  Use
 * '0' instead of INVALID_PAGE to indicate an invalid PAE root.
 */
#define INVALID_PAE_ROOT …
#define IS_VALID_PAE_ROOT(x) …

static inline hpa_t kvm_mmu_get_dummy_root(void)
{ … }

static inline bool kvm_mmu_is_dummy_root(hpa_t shadow_page)
{ … }

tdp_ptep_t;

struct kvm_mmu_page { … };

extern struct kmem_cache *mmu_page_header_cache;

static inline int kvm_mmu_role_as_id(union kvm_mmu_page_role role)
{ … }

static inline int kvm_mmu_page_as_id(struct kvm_mmu_page *sp)
{ … }

static inline bool kvm_mmu_page_ad_need_write_protect(struct kvm_mmu_page *sp)
{ … }

static inline gfn_t gfn_round_for_level(gfn_t gfn, int level)
{ … }

int mmu_try_to_unsync_pages(struct kvm *kvm, const struct kvm_memory_slot *slot,
			    gfn_t gfn, bool can_unsync, bool prefetch);

void kvm_mmu_gfn_disallow_lpage(const struct kvm_memory_slot *slot, gfn_t gfn);
void kvm_mmu_gfn_allow_lpage(const struct kvm_memory_slot *slot, gfn_t gfn);
bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
				    struct kvm_memory_slot *slot, u64 gfn,
				    int min_level);

/* Flush the given page (huge or not) of guest memory. */
static inline void kvm_flush_remote_tlbs_gfn(struct kvm *kvm, gfn_t gfn, int level)
{ … }

unsigned int pte_list_count(struct kvm_rmap_head *rmap_head);

extern int nx_huge_pages;
static inline bool is_nx_huge_page_enabled(struct kvm *kvm)
{ … }

struct kvm_page_fault { … };

int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);

/*
 * Return values of handle_mmio_page_fault(), mmu.page_fault(), fast_page_fault(),
 * and of course kvm_mmu_do_page_fault().
 *
 * RET_PF_CONTINUE: So far, so good, keep handling the page fault.
 * RET_PF_RETRY: let CPU fault again on the address.
 * RET_PF_EMULATE: mmio page fault, emulate the instruction directly.
 * RET_PF_INVALID: the spte is invalid, let the real page fault path update it.
 * RET_PF_FIXED: The faulting entry has been fixed.
 * RET_PF_SPURIOUS: The faulting entry was already fixed, e.g. by another vCPU.
 *
 * Any names added to this enum should be exported to userspace for use in
 * tracepoints via TRACE_DEFINE_ENUM() in mmutrace.h
 *
 * Note, all values must be greater than or equal to zero so as not to encroach
 * on -errno return values.  Somewhat arbitrarily use '0' for CONTINUE, which
 * will allow for efficient machine code when checking for CONTINUE, e.g.
 * "TEST %rax, %rax, JNZ", as all "stop!" values are non-zero.
 */
enum { … };

static inline void kvm_mmu_prepare_memory_fault_exit(struct kvm_vcpu *vcpu,
						     struct kvm_page_fault *fault)
{ … }

static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
					u64 err, bool prefetch,
					int *emulation_type, u8 *level)
{ … }

int kvm_mmu_max_mapping_level(struct kvm *kvm,
			      const struct kvm_memory_slot *slot, gfn_t gfn,
			      int max_level);
void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);
void disallowed_hugepage_adjust(struct kvm_page_fault *fault, u64 spte, int cur_level);

void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);

void track_possible_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp);
void untrack_possible_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp);

#endif /* __KVM_X86_MMU_INTERNAL_H */