1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef ASM_KVM_CACHE_REGS_H 3 #define ASM_KVM_CACHE_REGS_H 4 5 #include <linux/kvm_host.h> 6 7 #define KVM_POSSIBLE_CR0_GUEST_BITS X86_CR0_TS 8 #define KVM_POSSIBLE_CR4_GUEST_BITS \ 9 (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \ 10 | X86_CR4_OSXMMEXCPT | X86_CR4_PGE | X86_CR4_TSD | X86_CR4_FSGSBASE) 11 12 #define BUILD_KVM_GPR_ACCESSORS(lname, uname) \ 13 static __always_inline unsigned long kvm_##lname##_read(struct kvm_vcpu *vcpu)\ 14 { \ 15 return vcpu->arch.regs[VCPU_REGS_##uname]; \ 16 } \ 17 static __always_inline void kvm_##lname##_write(struct kvm_vcpu *vcpu, \ 18 unsigned long val) \ 19 { \ 20 vcpu->arch.regs[VCPU_REGS_##uname] = val; \ 21 } 22 BUILD_KVM_GPR_ACCESSORS(rax, RAX) 23 BUILD_KVM_GPR_ACCESSORS(rbx, RBX) 24 BUILD_KVM_GPR_ACCESSORS(rcx, RCX) 25 BUILD_KVM_GPR_ACCESSORS(rdx, RDX) 26 BUILD_KVM_GPR_ACCESSORS(rbp, RBP) 27 BUILD_KVM_GPR_ACCESSORS(rsi, RSI) 28 BUILD_KVM_GPR_ACCESSORS(rdi, RDI) 29 #ifdef CONFIG_X86_64 30 BUILD_KVM_GPR_ACCESSORS(r8, R8) 31 BUILD_KVM_GPR_ACCESSORS(r9, R9) 32 BUILD_KVM_GPR_ACCESSORS(r10, R10) 33 BUILD_KVM_GPR_ACCESSORS(r11, R11) 34 BUILD_KVM_GPR_ACCESSORS(r12, R12) 35 BUILD_KVM_GPR_ACCESSORS(r13, R13) 36 BUILD_KVM_GPR_ACCESSORS(r14, R14) 37 BUILD_KVM_GPR_ACCESSORS(r15, R15) 38 #endif 39 40 static inline bool kvm_register_is_available(struct kvm_vcpu *vcpu, 41 enum kvm_reg reg) 42 { 43 return test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); 44 } 45 46 static inline bool kvm_register_is_dirty(struct kvm_vcpu *vcpu, 47 enum kvm_reg reg) 48 { 49 return test_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty); 50 } 51 52 static inline void kvm_register_mark_available(struct kvm_vcpu *vcpu, 53 enum kvm_reg reg) 54 { 55 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); 56 } 57 58 static inline void kvm_register_mark_dirty(struct kvm_vcpu *vcpu, 59 enum kvm_reg reg) 60 { 61 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); 62 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty); 63 } 64 65 static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu, int reg) 66 { 67 if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS)) 68 return 0; 69 70 if (!kvm_register_is_available(vcpu, reg)) 71 static_call(kvm_x86_cache_reg)(vcpu, reg); 72 73 return vcpu->arch.regs[reg]; 74 } 75 76 static inline void kvm_register_write(struct kvm_vcpu *vcpu, int reg, 77 unsigned long val) 78 { 79 if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS)) 80 return; 81 82 vcpu->arch.regs[reg] = val; 83 kvm_register_mark_dirty(vcpu, reg); 84 } 85 86 static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu) 87 { 88 return kvm_register_read(vcpu, VCPU_REGS_RIP); 89 } 90 91 static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val) 92 { 93 kvm_register_write(vcpu, VCPU_REGS_RIP, val); 94 } 95 96 static inline unsigned long kvm_rsp_read(struct kvm_vcpu *vcpu) 97 { 98 return kvm_register_read(vcpu, VCPU_REGS_RSP); 99 } 100 101 static inline void kvm_rsp_write(struct kvm_vcpu *vcpu, unsigned long val) 102 { 103 kvm_register_write(vcpu, VCPU_REGS_RSP, val); 104 } 105 106 static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index) 107 { 108 might_sleep(); /* on svm */ 109 110 if (!kvm_register_is_available(vcpu, VCPU_EXREG_PDPTR)) 111 static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_PDPTR); 112 113 return vcpu->arch.walk_mmu->pdptrs[index]; 114 } 115 116 static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask) 117 { 118 ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS; 119 if ((tmask & vcpu->arch.cr0_guest_owned_bits) && 120 !kvm_register_is_available(vcpu, VCPU_EXREG_CR0)) 121 static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR0); 122 return vcpu->arch.cr0 & mask; 123 } 124 125 static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu) 126 { 127 return kvm_read_cr0_bits(vcpu, ~0UL); 128 } 129 130 static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask) 131 { 132 ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS; 133 if ((tmask & vcpu->arch.cr4_guest_owned_bits) && 134 !kvm_register_is_available(vcpu, VCPU_EXREG_CR4)) 135 static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR4); 136 return vcpu->arch.cr4 & mask; 137 } 138 139 static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu) 140 { 141 if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3)) 142 static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR3); 143 return vcpu->arch.cr3; 144 } 145 146 static inline ulong kvm_read_cr4(struct kvm_vcpu *vcpu) 147 { 148 return kvm_read_cr4_bits(vcpu, ~0UL); 149 } 150 151 static inline u64 kvm_read_edx_eax(struct kvm_vcpu *vcpu) 152 { 153 return (kvm_rax_read(vcpu) & -1u) 154 | ((u64)(kvm_rdx_read(vcpu) & -1u) << 32); 155 } 156 157 static inline void enter_guest_mode(struct kvm_vcpu *vcpu) 158 { 159 vcpu->arch.hflags |= HF_GUEST_MASK; 160 } 161 162 static inline void leave_guest_mode(struct kvm_vcpu *vcpu) 163 { 164 vcpu->arch.hflags &= ~HF_GUEST_MASK; 165 166 if (vcpu->arch.load_eoi_exitmap_pending) { 167 vcpu->arch.load_eoi_exitmap_pending = false; 168 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu); 169 } 170 } 171 172 static inline bool is_guest_mode(struct kvm_vcpu *vcpu) 173 { 174 return vcpu->arch.hflags & HF_GUEST_MASK; 175 } 176 177 static inline bool is_smm(struct kvm_vcpu *vcpu) 178 { 179 return vcpu->arch.hflags & HF_SMM_MASK; 180 } 181 182 #endif 183