arch/x86/kvm/kvm_cache_regs.h

   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                 kvm_x86_ops.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                 kvm_x86_ops.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                 kvm_x86_ops.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                 kvm_x86_ops.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                 kvm_x86_ops.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