arch/x86/kvm/mmu.h

   1 #ifndef __KVM_X86_MMU_H
   2 #define __KVM_X86_MMU_H
   3
   4 #include <linux/kvm_host.h>
   5 #include "kvm_cache_regs.h"
   6
   7 #define PT64_PT_BITS 9
   8 #define PT64_ENT_PER_PAGE (1 << PT64_PT_BITS)
   9 #define PT32_PT_BITS 10
  10 #define PT32_ENT_PER_PAGE (1 << PT32_PT_BITS)
  11
  12 #define PT_WRITABLE_SHIFT 1
  13
  14 #define PT_PRESENT_MASK (1ULL << 0)
  15 #define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT)
  16 #define PT_USER_MASK (1ULL << 2)
  17 #define PT_PWT_MASK (1ULL << 3)
  18 #define PT_PCD_MASK (1ULL << 4)
  19 #define PT_ACCESSED_SHIFT 5
  20 #define PT_ACCESSED_MASK (1ULL << PT_ACCESSED_SHIFT)
  21 #define PT_DIRTY_SHIFT 6
  22 #define PT_DIRTY_MASK (1ULL << PT_DIRTY_SHIFT)
  23 #define PT_PAGE_SIZE_SHIFT 7
  24 #define PT_PAGE_SIZE_MASK (1ULL << PT_PAGE_SIZE_SHIFT)
  25 #define PT_PAT_MASK (1ULL << 7)
  26 #define PT_GLOBAL_MASK (1ULL << 8)
  27 #define PT64_NX_SHIFT 63
  28 #define PT64_NX_MASK (1ULL << PT64_NX_SHIFT)
  29
  30 #define PT_PAT_SHIFT 7
  31 #define PT_DIR_PAT_SHIFT 12
  32 #define PT_DIR_PAT_MASK (1ULL << PT_DIR_PAT_SHIFT)
  33
  34 #define PT32_DIR_PSE36_SIZE 4
  35 #define PT32_DIR_PSE36_SHIFT 13
  36 #define PT32_DIR_PSE36_MASK \
  37         (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT)
  38
  39 #define PT64_ROOT_LEVEL 4
  40 #define PT32_ROOT_LEVEL 2
  41 #define PT32E_ROOT_LEVEL 3
  42
  43 #define PT_PDPE_LEVEL 3
  44 #define PT_DIRECTORY_LEVEL 2
  45 #define PT_PAGE_TABLE_LEVEL 1
  46
  47 #define PFERR_PRESENT_MASK (1U << 0)
  48 #define PFERR_WRITE_MASK (1U << 1)
  49 #define PFERR_USER_MASK (1U << 2)
  50 #define PFERR_RSVD_MASK (1U << 3)
  51 #define PFERR_FETCH_MASK (1U << 4)
  52
  53 int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]);
  54 void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask);
  55
  56 /*
  57  * Return values of handle_mmio_page_fault_common:
  58  * RET_MMIO_PF_EMULATE: it is a real mmio page fault, emulate the instruction
  59  *                      directly.
  60  * RET_MMIO_PF_INVALID: invalid spte is detected then let the real page
  61  *                      fault path update the mmio spte.
  62  * RET_MMIO_PF_RETRY: let CPU fault again on the address.
  63  * RET_MMIO_PF_BUG: bug is detected.
  64  */
  65 enum {
  66         RET_MMIO_PF_EMULATE = 1,
  67         RET_MMIO_PF_INVALID = 2,
  68         RET_MMIO_PF_RETRY = 0,
  69         RET_MMIO_PF_BUG = -1
  70 };
  71
  72 int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct);
  73 int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context);
  74 int kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context,
  75                 bool execonly);
  76
  77 static inline unsigned int kvm_mmu_available_pages(struct kvm *kvm)
  78 {
  79         if (kvm->arch.n_max_mmu_pages > kvm->arch.n_used_mmu_pages)
  80                 return kvm->arch.n_max_mmu_pages -
  81                         kvm->arch.n_used_mmu_pages;
  82
  83         return 0;
  84 }
  85
  86 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
  87 {
  88         if (likely(vcpu->arch.mmu.root_hpa != INVALID_PAGE))
  89                 return 0;
  90
  91         return kvm_mmu_load(vcpu);
  92 }
  93
  94 static inline int is_present_gpte(unsigned long pte)
  95 {
  96         return pte & PT_PRESENT_MASK;
  97 }
  98
  99 static inline int is_writable_pte(unsigned long pte)
 100 {
 101         return pte & PT_WRITABLE_MASK;
 102 }
 103
 104 static inline bool is_write_protection(struct kvm_vcpu *vcpu)
 105 {
 106         return kvm_read_cr0_bits(vcpu, X86_CR0_WP);
 107 }
 108
 109 /*
 110  * Will a fault with a given page-fault error code (pfec) cause a permission
 111  * fault with the given access (in ACC_* format)?
 112  */
 113 static inline bool permission_fault(struct kvm_mmu *mmu, unsigned pte_access,
 114                                     unsigned pfec)
 115 {
 116         return (mmu->permissions[pfec >> 1] >> pte_access) & 1;
 117 }
 118
 119 void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm);
 120 #endif