1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef ARCH_X86_KVM_CPUID_H
3 #define ARCH_X86_KVM_CPUID_H
6 #include "reverse_cpuid.h"
8 #include <asm/processor.h>
9 #include <uapi/asm/kvm_para.h>
11 extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly;
12 void kvm_set_cpu_caps(void);
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,
20 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
21 struct kvm_cpuid_entry2 __user *entries,
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);
35 u32 xstate_required_size(u64 xstate_bv, bool compacted);
37 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
38 u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);
40 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
42 return vcpu->arch.maxphyaddr;
45 static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
47 return !(gpa & vcpu->arch.reserved_gpa_bits);
50 static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
51 gpa_t gpa, gpa_t alignment)
53 return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
56 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
58 return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
61 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
64 u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
66 BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
67 *reg = kvm_cpu_caps[leaf];
70 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
71 unsigned int x86_feature)
73 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
74 struct kvm_cpuid_entry2 *entry;
76 entry = kvm_find_cpuid_entry_index(vcpu, cpuid.function, cpuid.index);
80 return __cpuid_entry_get_reg(entry, cpuid.reg);
83 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
84 unsigned int x86_feature)
88 reg = guest_cpuid_get_register(vcpu, x86_feature);
92 return *reg & __feature_bit(x86_feature);
95 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
96 unsigned int x86_feature)
100 reg = guest_cpuid_get_register(vcpu, x86_feature);
102 *reg &= ~__feature_bit(x86_feature);
105 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
107 struct kvm_cpuid_entry2 *best;
109 best = kvm_find_cpuid_entry(vcpu, 0);
111 (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
112 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
115 static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu)
117 struct kvm_cpuid_entry2 *best;
119 best = kvm_find_cpuid_entry(vcpu, 0);
120 return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx);
123 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
125 struct kvm_cpuid_entry2 *best;
127 best = kvm_find_cpuid_entry(vcpu, 0x1);
131 return x86_family(best->eax);
134 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
136 struct kvm_cpuid_entry2 *best;
138 best = kvm_find_cpuid_entry(vcpu, 0x1);
142 return x86_model(best->eax);
145 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
147 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
150 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
152 struct kvm_cpuid_entry2 *best;
154 best = kvm_find_cpuid_entry(vcpu, 0x1);
158 return x86_stepping(best->eax);
161 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
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));
169 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
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));
176 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
178 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
181 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
183 return vcpu->arch.msr_misc_features_enables &
184 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
187 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
189 unsigned int x86_leaf = __feature_leaf(x86_feature);
191 reverse_cpuid_check(x86_leaf);
192 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
195 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
197 unsigned int x86_leaf = __feature_leaf(x86_feature);
199 reverse_cpuid_check(x86_leaf);
200 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
203 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
205 unsigned int x86_leaf = __feature_leaf(x86_feature);
207 reverse_cpuid_check(x86_leaf);
208 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
211 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
213 return !!kvm_cpu_cap_get(x86_feature);
216 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
218 if (boot_cpu_has(x86_feature))
219 kvm_cpu_cap_set(x86_feature);
222 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
223 unsigned int kvm_feature)
225 if (!vcpu->arch.pv_cpuid.enforce)
228 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
231 enum kvm_governed_features {
232 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x,
233 #include "governed_features.h"
234 KVM_NR_GOVERNED_FEATURES
237 static __always_inline int kvm_governed_feature_index(unsigned int x86_feature)
239 switch (x86_feature) {
240 #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x;
241 #include "governed_features.h"
247 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature)
249 return kvm_governed_feature_index(x86_feature) >= 0;
252 static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu,
253 unsigned int x86_feature)
255 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
257 __set_bit(kvm_governed_feature_index(x86_feature),
258 vcpu->arch.governed_features.enabled);
261 static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu,
262 unsigned int x86_feature)
264 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature))
265 kvm_governed_feature_set(vcpu, x86_feature);
268 static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu,
269 unsigned int x86_feature)
271 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
273 return test_bit(kvm_governed_feature_index(x86_feature),
274 vcpu->arch.governed_features.enabled);
277 static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
279 if (guest_can_use(vcpu, X86_FEATURE_LAM))
280 cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
282 return kvm_vcpu_is_legal_gpa(vcpu, cr3);