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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef ARCH_X86_KVM_CPUID_H
3#define ARCH_X86_KVM_CPUID_H
4
5#include "reverse_cpuid.h"
6#include <asm/cpu.h>
7#include <asm/processor.h>
8#include <uapi/asm/kvm_para.h>
9
10extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly;
11void kvm_set_cpu_caps(void);
12
13void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
14void kvm_update_pv_runtime(struct kvm_vcpu *vcpu);
15struct kvm_cpuid_entry2 *kvm_find_cpuid_entry_index(struct kvm_vcpu *vcpu,
16 u32 function, u32 index);
17struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
18 u32 function);
19int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
20 struct kvm_cpuid_entry2 __user *entries,
21 unsigned int type);
22int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
23 struct kvm_cpuid *cpuid,
24 struct kvm_cpuid_entry __user *entries);
25int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
26 struct kvm_cpuid2 *cpuid,
27 struct kvm_cpuid_entry2 __user *entries);
28int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
29 struct kvm_cpuid2 *cpuid,
30 struct kvm_cpuid_entry2 __user *entries);
31bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
32 u32 *ecx, u32 *edx, bool exact_only);
33
34void __init kvm_init_xstate_sizes(void);
35u32 xstate_required_size(u64 xstate_bv, bool compacted);
36
37int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
38u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);
39
40static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
41{
42 return vcpu->arch.maxphyaddr;
43}
44
45static 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
50static 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
56static 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
61static __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
70static __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
83static __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
95static __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
105static inline bool guest_cpuid_is_amd_compatible(struct kvm_vcpu *vcpu)
106{
107 return vcpu->arch.is_amd_compatible;
108}
109
110static inline bool guest_cpuid_is_intel_compatible(struct kvm_vcpu *vcpu)
111{
112 return !guest_cpuid_is_amd_compatible(vcpu);
113}
114
115static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
116{
117 struct kvm_cpuid_entry2 *best;
118
119 best = kvm_find_cpuid_entry(vcpu, 0x1);
120 if (!best)
121 return -1;
122
123 return x86_family(best->eax);
124}
125
126static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
127{
128 struct kvm_cpuid_entry2 *best;
129
130 best = kvm_find_cpuid_entry(vcpu, 0x1);
131 if (!best)
132 return -1;
133
134 return x86_model(best->eax);
135}
136
137static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
138{
139 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
140}
141
142static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
143{
144 struct kvm_cpuid_entry2 *best;
145
146 best = kvm_find_cpuid_entry(vcpu, 0x1);
147 if (!best)
148 return -1;
149
150 return x86_stepping(best->eax);
151}
152
153static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
154{
155 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
156 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
157 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
158 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
159}
160
161static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
162{
163 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
164 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) ||
165 guest_cpuid_has(vcpu, X86_FEATURE_SBPB));
166}
167
168static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
169{
170 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
171}
172
173static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
174{
175 return vcpu->arch.msr_misc_features_enables &
176 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
177}
178
179static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
180{
181 unsigned int x86_leaf = __feature_leaf(x86_feature);
182
183 reverse_cpuid_check(x86_leaf);
184 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
185}
186
187static __always_inline void kvm_cpu_cap_set(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
195static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
196{
197 unsigned int x86_leaf = __feature_leaf(x86_feature);
198
199 reverse_cpuid_check(x86_leaf);
200 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
201}
202
203static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
204{
205 return !!kvm_cpu_cap_get(x86_feature);
206}
207
208static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
209{
210 if (boot_cpu_has(x86_feature))
211 kvm_cpu_cap_set(x86_feature);
212}
213
214static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
215 unsigned int kvm_feature)
216{
217 if (!vcpu->arch.pv_cpuid.enforce)
218 return true;
219
220 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
221}
222
223enum kvm_governed_features {
224#define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x,
225#include "governed_features.h"
226 KVM_NR_GOVERNED_FEATURES
227};
228
229static __always_inline int kvm_governed_feature_index(unsigned int x86_feature)
230{
231 switch (x86_feature) {
232#define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x;
233#include "governed_features.h"
234 default:
235 return -1;
236 }
237}
238
239static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature)
240{
241 return kvm_governed_feature_index(x86_feature) >= 0;
242}
243
244static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu,
245 unsigned int x86_feature)
246{
247 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
248
249 __set_bit(kvm_governed_feature_index(x86_feature),
250 vcpu->arch.governed_features.enabled);
251}
252
253static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu,
254 unsigned int x86_feature)
255{
256 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature))
257 kvm_governed_feature_set(vcpu, x86_feature);
258}
259
260static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu,
261 unsigned int x86_feature)
262{
263 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
264
265 return test_bit(kvm_governed_feature_index(x86_feature),
266 vcpu->arch.governed_features.enabled);
267}
268
269static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
270{
271 if (guest_can_use(vcpu, X86_FEATURE_LAM))
272 cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
273
274 return kvm_vcpu_is_legal_gpa(vcpu, cr3);
275}
276
277#endif
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
11extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly;
12void kvm_set_cpu_caps(void);
13
14void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
15void kvm_update_pv_runtime(struct kvm_vcpu *vcpu);
16struct kvm_cpuid_entry2 *kvm_find_cpuid_entry_index(struct kvm_vcpu *vcpu,
17 u32 function, u32 index);
18struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
19 u32 function);
20int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
21 struct kvm_cpuid_entry2 __user *entries,
22 unsigned int type);
23int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
24 struct kvm_cpuid *cpuid,
25 struct kvm_cpuid_entry __user *entries);
26int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
27 struct kvm_cpuid2 *cpuid,
28 struct kvm_cpuid_entry2 __user *entries);
29int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
30 struct kvm_cpuid2 *cpuid,
31 struct kvm_cpuid_entry2 __user *entries);
32bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
33 u32 *ecx, u32 *edx, bool exact_only);
34
35u32 xstate_required_size(u64 xstate_bv, bool compacted);
36
37int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
38u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);
39
40static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
41{
42 return vcpu->arch.maxphyaddr;
43}
44
45static 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
50static 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
56static 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
61static __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
70static __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
83static __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
95static __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
105static 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
115static 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
123static inline bool guest_cpuid_is_amd_compatible(struct kvm_vcpu *vcpu)
124{
125 return vcpu->arch.is_amd_compatible;
126}
127
128static inline bool guest_cpuid_is_intel_compatible(struct kvm_vcpu *vcpu)
129{
130 return !guest_cpuid_is_amd_compatible(vcpu);
131}
132
133static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
134{
135 struct kvm_cpuid_entry2 *best;
136
137 best = kvm_find_cpuid_entry(vcpu, 0x1);
138 if (!best)
139 return -1;
140
141 return x86_family(best->eax);
142}
143
144static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
145{
146 struct kvm_cpuid_entry2 *best;
147
148 best = kvm_find_cpuid_entry(vcpu, 0x1);
149 if (!best)
150 return -1;
151
152 return x86_model(best->eax);
153}
154
155static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
156{
157 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
158}
159
160static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
161{
162 struct kvm_cpuid_entry2 *best;
163
164 best = kvm_find_cpuid_entry(vcpu, 0x1);
165 if (!best)
166 return -1;
167
168 return x86_stepping(best->eax);
169}
170
171static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
172{
173 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
174 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
175 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
176 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
177}
178
179static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
180{
181 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
182 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) ||
183 guest_cpuid_has(vcpu, X86_FEATURE_SBPB));
184}
185
186static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
187{
188 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
189}
190
191static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
192{
193 return vcpu->arch.msr_misc_features_enables &
194 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
195}
196
197static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
198{
199 unsigned int x86_leaf = __feature_leaf(x86_feature);
200
201 reverse_cpuid_check(x86_leaf);
202 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
203}
204
205static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
206{
207 unsigned int x86_leaf = __feature_leaf(x86_feature);
208
209 reverse_cpuid_check(x86_leaf);
210 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
211}
212
213static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
214{
215 unsigned int x86_leaf = __feature_leaf(x86_feature);
216
217 reverse_cpuid_check(x86_leaf);
218 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
219}
220
221static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
222{
223 return !!kvm_cpu_cap_get(x86_feature);
224}
225
226static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
227{
228 if (boot_cpu_has(x86_feature))
229 kvm_cpu_cap_set(x86_feature);
230}
231
232static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
233 unsigned int kvm_feature)
234{
235 if (!vcpu->arch.pv_cpuid.enforce)
236 return true;
237
238 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
239}
240
241enum kvm_governed_features {
242#define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x,
243#include "governed_features.h"
244 KVM_NR_GOVERNED_FEATURES
245};
246
247static __always_inline int kvm_governed_feature_index(unsigned int x86_feature)
248{
249 switch (x86_feature) {
250#define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x;
251#include "governed_features.h"
252 default:
253 return -1;
254 }
255}
256
257static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature)
258{
259 return kvm_governed_feature_index(x86_feature) >= 0;
260}
261
262static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu,
263 unsigned int x86_feature)
264{
265 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
266
267 __set_bit(kvm_governed_feature_index(x86_feature),
268 vcpu->arch.governed_features.enabled);
269}
270
271static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu,
272 unsigned int x86_feature)
273{
274 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature))
275 kvm_governed_feature_set(vcpu, x86_feature);
276}
277
278static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu,
279 unsigned int x86_feature)
280{
281 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature));
282
283 return test_bit(kvm_governed_feature_index(x86_feature),
284 vcpu->arch.governed_features.enabled);
285}
286
287static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
288{
289 if (guest_can_use(vcpu, X86_FEATURE_LAM))
290 cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
291
292 return kvm_vcpu_is_legal_gpa(vcpu, cr3);
293}
294
295#endif