arch/x86/kvm/cpuid.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ARCH_X86_KVM_CPUID_H
   3 #define ARCH_X86_KVM_CPUID_H
   4
   5 #include "x86.h"
   6 #include "reverse_cpuid.h"
   7 #include <asm/cpu.h>
   8 #include <asm/processor.h>
   9 #include <uapi/asm/kvm_para.h>
  10
  11 extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly;
  12 void kvm_set_cpu_caps(void);
  13
  14 void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
  15 void kvm_update_pv_runtime(struct kvm_vcpu *vcpu);
  16 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry_index(struct kvm_vcpu *vcpu,
  17                                                     u32 function, u32 index);
  18 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
  19                                               u32 function);
  20 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
  21                             struct kvm_cpuid_entry2 __user *entries,
  22                             unsigned int type);
  23 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
  24                              struct kvm_cpuid *cpuid,
  25                              struct kvm_cpuid_entry __user *entries);
  26 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
  27                               struct kvm_cpuid2 *cpuid,
  28                               struct kvm_cpuid_entry2 __user *entries);
  29 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
  30                               struct kvm_cpuid2 *cpuid,
  31                               struct kvm_cpuid_entry2 __user *entries);
  32 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
  33                u32 *ecx, u32 *edx, bool exact_only);
  34
  35 u32 xstate_required_size(u64 xstate_bv, bool compacted);
  36
  37 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
  38 u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);
  39
  40 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
  41 {
  42         return vcpu->arch.maxphyaddr;
  43 }
  44
  45 static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
  46 {
  47         return !(gpa & vcpu->arch.reserved_gpa_bits);
  48 }
  49
  50 static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
  51                                                  gpa_t gpa, gpa_t alignment)
  52 {
  53         return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
  54 }
  55
  56 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
  57 {
  58         return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
  59 }
  60
  61 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
  62                                                  unsigned int leaf)
  63 {
  64         u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
  65
  66         BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
  67         *reg = kvm_cpu_caps[leaf];
  68 }
  69
  70 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
  71                                                      unsigned int x86_feature)
  72 {
  73         const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
  74         struct kvm_cpuid_entry2 *entry;
  75
  76         entry = kvm_find_cpuid_entry_index(vcpu, cpuid.function, cpuid.index);
  77         if (!entry)
  78                 return NULL;
  79
  80         return __cpuid_entry_get_reg(entry, cpuid.reg);
  81 }
  82
  83 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
  84                                             unsigned int x86_feature)
  85 {
  86         u32 *reg;
  87
  88         reg = guest_cpuid_get_register(vcpu, x86_feature);
  89         if (!reg)
  90                 return false;
  91
  92         return *reg & __feature_bit(x86_feature);
  93 }
  94
  95 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
  96                                               unsigned int x86_feature)
  97 {
  98         u32 *reg;
  99
 100         reg = guest_cpuid_get_register(vcpu, x86_feature);
 101         if (reg)
 102                 *reg &= ~__feature_bit(x86_feature);
 103 }
 104
 105 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
 106 {
 107         struct kvm_cpuid_entry2 *best;
 108
 109         best = kvm_find_cpuid_entry(vcpu, 0);
 110         return best &&
 111                (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
 112                 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
 113 }
 114
 115 static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu)
 116 {
 117         struct kvm_cpuid_entry2 *best;
 118
 119         best = kvm_find_cpuid_entry(vcpu, 0);
 120         return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx);
 121 }
 122
 123 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
 124 {
 125         struct kvm_cpuid_entry2 *best;
 126
 127         best = kvm_find_cpuid_entry(vcpu, 0x1);
 128         if (!best)
 129                 return -1;
 130
 131         return x86_family(best->eax);
 132 }
 133
 134 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
 135 {
 136         struct kvm_cpuid_entry2 *best;
 137
 138         best = kvm_find_cpuid_entry(vcpu, 0x1);
 139         if (!best)
 140                 return -1;
 141
 142         return x86_model(best->eax);
 143 }
 144
 145 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
 146 {
 147         return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
 148 }
 149
 150 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
 151 {
 152         struct kvm_cpuid_entry2 *best;
 153
 154         best = kvm_find_cpuid_entry(vcpu, 0x1);
 155         if (!best)
 156                 return -1;
 157
 158         return x86_stepping(best->eax);
 159 }
 160
 161 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
 162 {
 163         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 164                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
 165                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
 166                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
 167 }
 168
 169 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
 170 {
 171         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 172                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) ||
 173                 guest_cpuid_has(vcpu, X86_FEATURE_SBPB));
 174 }
 175
 176 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
 177 {
 178         return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
 179 }
 180
 181 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
 182 {
 183         return vcpu->arch.msr_misc_features_enables &
 184                   MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
 185 }
 186
 187 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
 188 {
 189         unsigned int x86_leaf = __feature_leaf(x86_feature);
 190
 191         reverse_cpuid_check(x86_leaf);
 192         kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
 193 }
 194
 195 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
 196 {
 197         unsigned int x86_leaf = __feature_leaf(x86_feature);
 198
 199         reverse_cpuid_check(x86_leaf);
 200         kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
 201 }
 202
 203 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
 204 {
 205         unsigned int x86_leaf = __feature_leaf(x86_feature);
 206
 207         reverse_cpuid_check(x86_leaf);
 208         return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
 209 }
 210
 211 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
 212 {
 213         return !!kvm_cpu_cap_get(x86_feature);
 214 }
 215
 216 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
 217 {
 218         if (boot_cpu_has(x86_feature))
 219                 kvm_cpu_cap_set(x86_feature);
 220 }
 221
 222 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
 223                                          unsigned int kvm_feature)
 224 {
 225         if (!vcpu->arch.pv_cpuid.enforce)
 226                 return true;
 227
 228         return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
 229 }
 230
 231 enum kvm_governed_features {
 232 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x,
 233 #include "governed_features.h"
 234         KVM_NR_GOVERNED_FEATURES
 235 };
 236
 237 static __always_inline int kvm_governed_feature_index(unsigned int x86_feature)
 238 {
 239         switch (x86_feature) {
 240 #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x;
 241 #include "governed_features.h"
 242         default:
 243                 return -1;
 244         }
 245 }
 246
 247 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature)
 248 {
 249         return kvm_governed_feature_index(x86_feature) >= 0;
 250 }
 251
 252 static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu,
 253                                                      unsigned int x86_feature)
 254 {
 255         BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
 256
 257         __set_bit(kvm_governed_feature_index(x86_feature),
 258                   vcpu->arch.governed_features.enabled);
 259 }
 260
 261 static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu,
 262                                                                unsigned int x86_feature)
 263 {
 264         if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature))
 265                 kvm_governed_feature_set(vcpu, x86_feature);
 266 }
 267
 268 static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu,
 269                                           unsigned int x86_feature)
 270 {
 271         BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
 272
 273         return test_bit(kvm_governed_feature_index(x86_feature),
 274                         vcpu->arch.governed_features.enabled);
 275 }
 276
 277 static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 278 {
 279         if (guest_can_use(vcpu, X86_FEATURE_LAM))
 280                 cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
 281
 282         return kvm_vcpu_is_legal_gpa(vcpu, cr3);
 283 }
 284
 285 #endif