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(struct kvm_vcpu *vcpu,
  17                                               u32 function, u32 index);
  18 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
  19                             struct kvm_cpuid_entry2 __user *entries,
  20                             unsigned int type);
  21 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
  22                              struct kvm_cpuid *cpuid,
  23                              struct kvm_cpuid_entry __user *entries);
  24 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
  25                               struct kvm_cpuid2 *cpuid,
  26                               struct kvm_cpuid_entry2 __user *entries);
  27 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
  28                               struct kvm_cpuid2 *cpuid,
  29                               struct kvm_cpuid_entry2 __user *entries);
  30 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
  31                u32 *ecx, u32 *edx, bool exact_only);
  32
  33 u32 xstate_required_size(u64 xstate_bv, bool compacted);
  34
  35 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
  36 u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);
  37
  38 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
  39 {
  40         return vcpu->arch.maxphyaddr;
  41 }
  42
  43 static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
  44 {
  45         return !(gpa & vcpu->arch.reserved_gpa_bits);
  46 }
  47
  48 static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
  49 {
  50         return !kvm_vcpu_is_legal_gpa(vcpu, gpa);
  51 }
  52
  53 static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
  54                                                  gpa_t gpa, gpa_t alignment)
  55 {
  56         return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
  57 }
  58
  59 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
  60 {
  61         return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
  62 }
  63
  64 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
  65                                                  unsigned int leaf)
  66 {
  67         u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
  68
  69         BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
  70         *reg = kvm_cpu_caps[leaf];
  71 }
  72
  73 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
  74                                                      unsigned int x86_feature)
  75 {
  76         const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
  77         struct kvm_cpuid_entry2 *entry;
  78
  79         entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
  80         if (!entry)
  81                 return NULL;
  82
  83         return __cpuid_entry_get_reg(entry, cpuid.reg);
  84 }
  85
  86 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
  87                                             unsigned int x86_feature)
  88 {
  89         u32 *reg;
  90
  91         reg = guest_cpuid_get_register(vcpu, x86_feature);
  92         if (!reg)
  93                 return false;
  94
  95         return *reg & __feature_bit(x86_feature);
  96 }
  97
  98 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
  99                                               unsigned int x86_feature)
 100 {
 101         u32 *reg;
 102
 103         reg = guest_cpuid_get_register(vcpu, x86_feature);
 104         if (reg)
 105                 *reg &= ~__feature_bit(x86_feature);
 106 }
 107
 108 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
 109 {
 110         struct kvm_cpuid_entry2 *best;
 111
 112         best = kvm_find_cpuid_entry(vcpu, 0, 0);
 113         return best &&
 114                (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
 115                 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
 116 }
 117
 118 static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu)
 119 {
 120         struct kvm_cpuid_entry2 *best;
 121
 122         best = kvm_find_cpuid_entry(vcpu, 0, 0);
 123         return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx);
 124 }
 125
 126 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
 127 {
 128         struct kvm_cpuid_entry2 *best;
 129
 130         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 131         if (!best)
 132                 return -1;
 133
 134         return x86_family(best->eax);
 135 }
 136
 137 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
 138 {
 139         struct kvm_cpuid_entry2 *best;
 140
 141         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 142         if (!best)
 143                 return -1;
 144
 145         return x86_model(best->eax);
 146 }
 147
 148 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
 149 {
 150         struct kvm_cpuid_entry2 *best;
 151
 152         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 153         if (!best)
 154                 return -1;
 155
 156         return x86_stepping(best->eax);
 157 }
 158
 159 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
 160 {
 161         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 162                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
 163                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
 164                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
 165 }
 166
 167 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
 168 {
 169         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 170                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB));
 171 }
 172
 173 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
 174 {
 175         return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
 176 }
 177
 178 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
 179 {
 180         return vcpu->arch.msr_misc_features_enables &
 181                   MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
 182 }
 183
 184 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
 185 {
 186         unsigned int x86_leaf = __feature_leaf(x86_feature);
 187
 188         reverse_cpuid_check(x86_leaf);
 189         kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
 190 }
 191
 192 static __always_inline void kvm_cpu_cap_set(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 u32 kvm_cpu_cap_get(unsigned int x86_feature)
 201 {
 202         unsigned int x86_leaf = __feature_leaf(x86_feature);
 203
 204         reverse_cpuid_check(x86_leaf);
 205         return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
 206 }
 207
 208 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
 209 {
 210         return !!kvm_cpu_cap_get(x86_feature);
 211 }
 212
 213 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
 214 {
 215         if (boot_cpu_has(x86_feature))
 216                 kvm_cpu_cap_set(x86_feature);
 217 }
 218
 219 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
 220                                          unsigned int kvm_feature)
 221 {
 222         if (!vcpu->arch.pv_cpuid.enforce)
 223                 return true;
 224
 225         return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
 226 }
 227
 228 #endif