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 void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context); 74 void 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 121