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
cpuid_maxphyaddr(struct kvm_vcpu * vcpu)40 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
41 {
42 return vcpu->arch.maxphyaddr;
43 }
44
kvm_vcpu_is_legal_gpa(struct kvm_vcpu * vcpu,gpa_t gpa)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
kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu * vcpu,gpa_t gpa,gpa_t alignment)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
page_address_valid(struct kvm_vcpu * vcpu,gpa_t gpa)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
cpuid_entry_override(struct kvm_cpuid_entry2 * entry,unsigned int leaf)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
guest_cpuid_get_register(struct kvm_vcpu * vcpu,unsigned int x86_feature)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
guest_cpuid_has(struct kvm_vcpu * vcpu,unsigned int x86_feature)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
guest_cpuid_clear(struct kvm_vcpu * vcpu,unsigned int x86_feature)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
guest_cpuid_is_amd_or_hygon(struct kvm_vcpu * vcpu)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
guest_cpuid_is_intel(struct kvm_vcpu * vcpu)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
guest_cpuid_family(struct kvm_vcpu * vcpu)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
guest_cpuid_model(struct kvm_vcpu * vcpu)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
cpuid_model_is_consistent(struct kvm_vcpu * vcpu)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
guest_cpuid_stepping(struct kvm_vcpu * vcpu)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
guest_has_spec_ctrl_msr(struct kvm_vcpu * vcpu)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
guest_has_pred_cmd_msr(struct kvm_vcpu * vcpu)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
supports_cpuid_fault(struct kvm_vcpu * vcpu)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
cpuid_fault_enabled(struct kvm_vcpu * vcpu)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
kvm_cpu_cap_clear(unsigned int x86_feature)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
kvm_cpu_cap_set(unsigned int x86_feature)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
kvm_cpu_cap_get(unsigned int x86_feature)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
kvm_cpu_cap_has(unsigned int x86_feature)211 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
212 {
213 return !!kvm_cpu_cap_get(x86_feature);
214 }
215
kvm_cpu_cap_check_and_set(unsigned int x86_feature)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
guest_pv_has(struct kvm_vcpu * vcpu,unsigned int kvm_feature)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
kvm_governed_feature_index(unsigned int x86_feature)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
kvm_is_governed_feature(unsigned int x86_feature)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
kvm_governed_feature_set(struct kvm_vcpu * vcpu,unsigned int x86_feature)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
kvm_governed_feature_check_and_set(struct kvm_vcpu * vcpu,unsigned int x86_feature)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
guest_can_use(struct kvm_vcpu * vcpu,unsigned int x86_feature)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
kvm_vcpu_is_legal_cr3(struct kvm_vcpu * vcpu,unsigned long cr3)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
286