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 int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct); 56 int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context); 57 58 static inline unsigned int kvm_mmu_available_pages(struct kvm *kvm) 59 { 60 return kvm->arch.n_max_mmu_pages - 61 kvm->arch.n_used_mmu_pages; 62 } 63 64 static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) 65 { 66 if (unlikely(kvm_mmu_available_pages(vcpu->kvm)< KVM_MIN_FREE_MMU_PAGES)) 67 __kvm_mmu_free_some_pages(vcpu); 68 } 69 70 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu) 71 { 72 if (likely(vcpu->arch.mmu.root_hpa != INVALID_PAGE)) 73 return 0; 74 75 return kvm_mmu_load(vcpu); 76 } 77 78 static inline int is_present_gpte(unsigned long pte) 79 { 80 return pte & PT_PRESENT_MASK; 81 } 82 83 static inline int is_writable_pte(unsigned long pte) 84 { 85 return pte & PT_WRITABLE_MASK; 86 } 87 88 static inline bool is_write_protection(struct kvm_vcpu *vcpu) 89 { 90 return kvm_read_cr0_bits(vcpu, X86_CR0_WP); 91 } 92 93 /* 94 * Will a fault with a given page-fault error code (pfec) cause a permission 95 * fault with the given access (in ACC_* format)? 96 */ 97 static inline bool permission_fault(struct kvm_mmu *mmu, unsigned pte_access, 98 unsigned pfec) 99 { 100 return (mmu->permissions[pfec >> 1] >> pte_access) & 1; 101 } 102 103 #endif 104