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_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
  51 {
  52         return !kvm_vcpu_is_legal_gpa(vcpu, gpa);
  53 }
  54
  55 static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
  56                                                  gpa_t gpa, gpa_t alignment)
  57 {
  58         return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
  59 }
  60
  61 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
  62 {
  63         return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
  64 }
  65
  66 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
  67                                                  unsigned int leaf)
  68 {
  69         u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
  70
  71         BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
  72         *reg = kvm_cpu_caps[leaf];
  73 }
  74
  75 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
  76                                                      unsigned int x86_feature)
  77 {
  78         const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
  79         struct kvm_cpuid_entry2 *entry;
  80
  81         entry = kvm_find_cpuid_entry_index(vcpu, cpuid.function, cpuid.index);
  82         if (!entry)
  83                 return NULL;
  84
  85         return __cpuid_entry_get_reg(entry, cpuid.reg);
  86 }
  87
  88 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
  89                                             unsigned int x86_feature)
  90 {
  91         u32 *reg;
  92
  93         reg = guest_cpuid_get_register(vcpu, x86_feature);
  94         if (!reg)
  95                 return false;
  96
  97         return *reg & __feature_bit(x86_feature);
  98 }
  99
 100 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
 101                                               unsigned int x86_feature)
 102 {
 103         u32 *reg;
 104
 105         reg = guest_cpuid_get_register(vcpu, x86_feature);
 106         if (reg)
 107                 *reg &= ~__feature_bit(x86_feature);
 108 }
 109
 110 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
 111 {
 112         struct kvm_cpuid_entry2 *best;
 113
 114         best = kvm_find_cpuid_entry(vcpu, 0);
 115         return best &&
 116                (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
 117                 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
 118 }
 119
 120 static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu)
 121 {
 122         struct kvm_cpuid_entry2 *best;
 123
 124         best = kvm_find_cpuid_entry(vcpu, 0);
 125         return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx);
 126 }
 127
 128 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
 129 {
 130         struct kvm_cpuid_entry2 *best;
 131
 132         best = kvm_find_cpuid_entry(vcpu, 0x1);
 133         if (!best)
 134                 return -1;
 135
 136         return x86_family(best->eax);
 137 }
 138
 139 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
 140 {
 141         struct kvm_cpuid_entry2 *best;
 142
 143         best = kvm_find_cpuid_entry(vcpu, 0x1);
 144         if (!best)
 145                 return -1;
 146
 147         return x86_model(best->eax);
 148 }
 149
 150 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
 151 {
 152         return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
 153 }
 154
 155 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
 156 {
 157         struct kvm_cpuid_entry2 *best;
 158
 159         best = kvm_find_cpuid_entry(vcpu, 0x1);
 160         if (!best)
 161                 return -1;
 162
 163         return x86_stepping(best->eax);
 164 }
 165
 166 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
 167 {
 168         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 169                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
 170                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
 171                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
 172 }
 173
 174 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
 175 {
 176         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 177                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) ||
 178                 guest_cpuid_has(vcpu, X86_FEATURE_SBPB));
 179 }
 180
 181 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
 182 {
 183         return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
 184 }
 185
 186 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
 187 {
 188         return vcpu->arch.msr_misc_features_enables &
 189                   MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
 190 }
 191
 192 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
 193 {
 194         unsigned int x86_leaf = __feature_leaf(x86_feature);
 195
 196         reverse_cpuid_check(x86_leaf);
 197         kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
 198 }
 199
 200 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
 201 {
 202         unsigned int x86_leaf = __feature_leaf(x86_feature);
 203
 204         reverse_cpuid_check(x86_leaf);
 205         kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
 206 }
 207
 208 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
 209 {
 210         unsigned int x86_leaf = __feature_leaf(x86_feature);
 211
 212         reverse_cpuid_check(x86_leaf);
 213         return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
 214 }
 215
 216 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
 217 {
 218         return !!kvm_cpu_cap_get(x86_feature);
 219 }
 220
 221 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
 222 {
 223         if (boot_cpu_has(x86_feature))
 224                 kvm_cpu_cap_set(x86_feature);
 225 }
 226
 227 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
 228                                          unsigned int kvm_feature)
 229 {
 230         if (!vcpu->arch.pv_cpuid.enforce)
 231                 return true;
 232
 233         return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
 234 }
 235
 236 enum kvm_governed_features {
 237 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x,
 238 #include "governed_features.h"
 239         KVM_NR_GOVERNED_FEATURES
 240 };
 241
 242 static __always_inline int kvm_governed_feature_index(unsigned int x86_feature)
 243 {
 244         switch (x86_feature) {
 245 #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x;
 246 #include "governed_features.h"
 247         default:
 248                 return -1;
 249         }
 250 }
 251
 252 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature)
 253 {
 254         return kvm_governed_feature_index(x86_feature) >= 0;
 255 }
 256
 257 static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu,
 258                                                      unsigned int x86_feature)
 259 {
 260         BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
 261
 262         __set_bit(kvm_governed_feature_index(x86_feature),
 263                   vcpu->arch.governed_features.enabled);
 264 }
 265
 266 static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu,
 267                                                                unsigned int x86_feature)
 268 {
 269         if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature))
 270                 kvm_governed_feature_set(vcpu, x86_feature);
 271 }
 272
 273 static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu,
 274                                           unsigned int x86_feature)
 275 {
 276         BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
 277
 278         return test_bit(kvm_governed_feature_index(x86_feature),
 279                         vcpu->arch.governed_features.enabled);
 280 }
 281
 282 static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 283 {
 284         return kvm_vcpu_is_legal_gpa(vcpu, cr3);
 285 }
 286
 287 #endif