LXR linux/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
  53int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]);
  54void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask);
  55int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct);
  56int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context);
  57
  58static inline unsigned int kvm_mmu_available_pages(struct kvm *kvm)
  59{
  60        if (kvm->arch.n_max_mmu_pages > kvm->arch.n_used_mmu_pages)
  61                return kvm->arch.n_max_mmu_pages -
  62                        kvm->arch.n_used_mmu_pages;
  63
  64        return 0;
  65}
  66
  67static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
  68{
  69        if (likely(vcpu->arch.mmu.root_hpa != INVALID_PAGE))
  70                return 0;
  71
  72        return kvm_mmu_load(vcpu);
  73}
  74
  75static inline int is_present_gpte(unsigned long pte)
  76{
  77        return pte & PT_PRESENT_MASK;
  78}
  79
  80static inline int is_writable_pte(unsigned long pte)
  81{
  82        return pte & PT_WRITABLE_MASK;
  83}
  84
  85static inline bool is_write_protection(struct kvm_vcpu *vcpu)
  86{
  87        return kvm_read_cr0_bits(vcpu, X86_CR0_WP);
  88}
  89
  90/*
  91 * Will a fault with a given page-fault error code (pfec) cause a permission
  92 * fault with the given access (in ACC_* format)?
  93 */
  94static inline bool permission_fault(struct kvm_mmu *mmu, unsigned pte_access,
  95                                    unsigned pfec)
  96{
  97        return (mmu->permissions[pfec >> 1] >> pte_access) & 1;
  98}
  99
 100#endif
 101