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 /*
  66  * The "raw" register helpers are only for cases where the full 64 bits of a
  67  * register are read/written irrespective of current vCPU mode.  In other words,
  68  * odds are good you shouldn't be using the raw variants.
  69  */
  70 static inline unsigned long kvm_register_read_raw(struct kvm_vcpu *vcpu, int reg)
  71 {
  72         if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS))
  73                 return 0;
  74
  75         if (!kvm_register_is_available(vcpu, reg))
  76                 static_call(kvm_x86_cache_reg)(vcpu, reg);
  77
  78         return vcpu->arch.regs[reg];
  79 }
  80
  81 static inline void kvm_register_write_raw(struct kvm_vcpu *vcpu, int reg,
  82                                           unsigned long val)
  83 {
  84         if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS))
  85                 return;
  86
  87         vcpu->arch.regs[reg] = val;
  88         kvm_register_mark_dirty(vcpu, reg);
  89 }
  90
  91 static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu)
  92 {
  93         return kvm_register_read_raw(vcpu, VCPU_REGS_RIP);
  94 }
  95
  96 static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val)
  97 {
  98         kvm_register_write_raw(vcpu, VCPU_REGS_RIP, val);
  99 }
 100
 101 static inline unsigned long kvm_rsp_read(struct kvm_vcpu *vcpu)
 102 {
 103         return kvm_register_read_raw(vcpu, VCPU_REGS_RSP);
 104 }
 105
 106 static inline void kvm_rsp_write(struct kvm_vcpu *vcpu, unsigned long val)
 107 {
 108         kvm_register_write_raw(vcpu, VCPU_REGS_RSP, val);
 109 }
 110
 111 static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
 112 {
 113         might_sleep();  /* on svm */
 114
 115         if (!kvm_register_is_available(vcpu, VCPU_EXREG_PDPTR))
 116                 static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_PDPTR);
 117
 118         return vcpu->arch.walk_mmu->pdptrs[index];
 119 }
 120
 121 static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
 122 {
 123         ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS;
 124         if ((tmask & vcpu->arch.cr0_guest_owned_bits) &&
 125             !kvm_register_is_available(vcpu, VCPU_EXREG_CR0))
 126                 static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR0);
 127         return vcpu->arch.cr0 & mask;
 128 }
 129
 130 static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu)
 131 {
 132         return kvm_read_cr0_bits(vcpu, ~0UL);
 133 }
 134
 135 static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask)
 136 {
 137         ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS;
 138         if ((tmask & vcpu->arch.cr4_guest_owned_bits) &&
 139             !kvm_register_is_available(vcpu, VCPU_EXREG_CR4))
 140                 static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR4);
 141         return vcpu->arch.cr4 & mask;
 142 }
 143
 144 static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu)
 145 {
 146         if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3))
 147                 static_call(kvm_x86_cache_reg)(vcpu, VCPU_EXREG_CR3);
 148         return vcpu->arch.cr3;
 149 }
 150
 151 static inline ulong kvm_read_cr4(struct kvm_vcpu *vcpu)
 152 {
 153         return kvm_read_cr4_bits(vcpu, ~0UL);
 154 }
 155
 156 static inline u64 kvm_read_edx_eax(struct kvm_vcpu *vcpu)
 157 {
 158         return (kvm_rax_read(vcpu) & -1u)
 159                 | ((u64)(kvm_rdx_read(vcpu) & -1u) << 32);
 160 }
 161
 162 static inline void enter_guest_mode(struct kvm_vcpu *vcpu)
 163 {
 164         vcpu->arch.hflags |= HF_GUEST_MASK;
 165 }
 166
 167 static inline void leave_guest_mode(struct kvm_vcpu *vcpu)
 168 {
 169         vcpu->arch.hflags &= ~HF_GUEST_MASK;
 170
 171         if (vcpu->arch.load_eoi_exitmap_pending) {
 172                 vcpu->arch.load_eoi_exitmap_pending = false;
 173                 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu);
 174         }
 175 }
 176
 177 static inline bool is_guest_mode(struct kvm_vcpu *vcpu)
 178 {
 179         return vcpu->arch.hflags & HF_GUEST_MASK;
 180 }
 181
 182 static inline bool is_smm(struct kvm_vcpu *vcpu)
 183 {
 184         return vcpu->arch.hflags & HF_SMM_MASK;
 185 }
 186
 187 #endif