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_LA57 | X86_CR4_PGE) 11 12 static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu, 13 enum kvm_reg reg) 14 { 15 if (!test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail)) 16 kvm_x86_ops->cache_reg(vcpu, reg); 17 18 return vcpu->arch.regs[reg]; 19 } 20 21 static inline void kvm_register_write(struct kvm_vcpu *vcpu, 22 enum kvm_reg reg, 23 unsigned long val) 24 { 25 vcpu->arch.regs[reg] = val; 26 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty); 27 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); 28 } 29 30 static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu) 31 { 32 return kvm_register_read(vcpu, VCPU_REGS_RIP); 33 } 34 35 static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val) 36 { 37 kvm_register_write(vcpu, VCPU_REGS_RIP, val); 38 } 39 40 static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index) 41 { 42 might_sleep(); /* on svm */ 43 44 if (!test_bit(VCPU_EXREG_PDPTR, 45 (unsigned long *)&vcpu->arch.regs_avail)) 46 kvm_x86_ops->cache_reg(vcpu, (enum kvm_reg)VCPU_EXREG_PDPTR); 47 48 return vcpu->arch.walk_mmu->pdptrs[index]; 49 } 50 51 static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask) 52 { 53 ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS; 54 if (tmask & vcpu->arch.cr0_guest_owned_bits) 55 kvm_x86_ops->decache_cr0_guest_bits(vcpu); 56 return vcpu->arch.cr0 & mask; 57 } 58 59 static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu) 60 { 61 return kvm_read_cr0_bits(vcpu, ~0UL); 62 } 63 64 static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask) 65 { 66 ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS; 67 if (tmask & vcpu->arch.cr4_guest_owned_bits) 68 kvm_x86_ops->decache_cr4_guest_bits(vcpu); 69 return vcpu->arch.cr4 & mask; 70 } 71 72 static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu) 73 { 74 if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail)) 75 kvm_x86_ops->decache_cr3(vcpu); 76 return vcpu->arch.cr3; 77 } 78 79 static inline ulong kvm_read_cr4(struct kvm_vcpu *vcpu) 80 { 81 return kvm_read_cr4_bits(vcpu, ~0UL); 82 } 83 84 static inline u64 kvm_read_edx_eax(struct kvm_vcpu *vcpu) 85 { 86 return (kvm_register_read(vcpu, VCPU_REGS_RAX) & -1u) 87 | ((u64)(kvm_register_read(vcpu, VCPU_REGS_RDX) & -1u) << 32); 88 } 89 90 static inline void enter_guest_mode(struct kvm_vcpu *vcpu) 91 { 92 vcpu->arch.hflags |= HF_GUEST_MASK; 93 } 94 95 static inline void leave_guest_mode(struct kvm_vcpu *vcpu) 96 { 97 vcpu->arch.hflags &= ~HF_GUEST_MASK; 98 99 if (vcpu->arch.load_eoi_exitmap_pending) { 100 vcpu->arch.load_eoi_exitmap_pending = false; 101 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu); 102 } 103 } 104 105 static inline bool is_guest_mode(struct kvm_vcpu *vcpu) 106 { 107 return vcpu->arch.hflags & HF_GUEST_MASK; 108 } 109 110 static inline bool is_smm(struct kvm_vcpu *vcpu) 111 { 112 return vcpu->arch.hflags & HF_SMM_MASK; 113 } 114 115 #endif 116