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_MASK (1ULL << 6) 22 #define PT_PAGE_SIZE_MASK (1ULL << 7) 23 #define PT_PAT_MASK (1ULL << 7) 24 #define PT_GLOBAL_MASK (1ULL << 8) 25 #define PT64_NX_SHIFT 63 26 #define PT64_NX_MASK (1ULL << PT64_NX_SHIFT) 27 28 #define PT_PAT_SHIFT 7 29 #define PT_DIR_PAT_SHIFT 12 30 #define PT_DIR_PAT_MASK (1ULL << PT_DIR_PAT_SHIFT) 31 32 #define PT32_DIR_PSE36_SIZE 4 33 #define PT32_DIR_PSE36_SHIFT 13 34 #define PT32_DIR_PSE36_MASK \ 35 (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT) 36 37 #define PT64_ROOT_LEVEL 4 38 #define PT32_ROOT_LEVEL 2 39 #define PT32E_ROOT_LEVEL 3 40 41 #define PT_PDPE_LEVEL 3 42 #define PT_DIRECTORY_LEVEL 2 43 #define PT_PAGE_TABLE_LEVEL 1 44 45 #define PFERR_PRESENT_MASK (1U << 0) 46 #define PFERR_WRITE_MASK (1U << 1) 47 #define PFERR_USER_MASK (1U << 2) 48 #define PFERR_RSVD_MASK (1U << 3) 49 #define PFERR_FETCH_MASK (1U << 4) 50 51 int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]); 52 void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask); 53 int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct); 54 int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context); 55 56 static inline unsigned int kvm_mmu_available_pages(struct kvm *kvm) 57 { 58 return kvm->arch.n_max_mmu_pages - 59 kvm->arch.n_used_mmu_pages; 60 } 61 62 static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) 63 { 64 if (unlikely(kvm_mmu_available_pages(vcpu->kvm)< KVM_MIN_FREE_MMU_PAGES)) 65 __kvm_mmu_free_some_pages(vcpu); 66 } 67 68 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu) 69 { 70 if (likely(vcpu->arch.mmu.root_hpa != INVALID_PAGE)) 71 return 0; 72 73 return kvm_mmu_load(vcpu); 74 } 75 76 static inline int is_present_gpte(unsigned long pte) 77 { 78 return pte & PT_PRESENT_MASK; 79 } 80 81 static inline int is_writable_pte(unsigned long pte) 82 { 83 return pte & PT_WRITABLE_MASK; 84 } 85 86 static inline bool is_write_protection(struct kvm_vcpu *vcpu) 87 { 88 return kvm_read_cr0_bits(vcpu, X86_CR0_WP); 89 } 90 91 static inline bool check_write_user_access(struct kvm_vcpu *vcpu, 92 bool write_fault, bool user_fault, 93 unsigned long pte) 94 { 95 if (unlikely(write_fault && !is_writable_pte(pte) 96 && (user_fault || is_write_protection(vcpu)))) 97 return false; 98 99 if (unlikely(user_fault && !(pte & PT_USER_MASK))) 100 return false; 101 102 return true; 103 } 104 #endif 105