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_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
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
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
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
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
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
105 static inline bool guest_cpuid_is_amd_compatible(struct kvm_vcpu *vcpu)
106 {
107 return vcpu->arch.is_amd_compatible;
108 }
109
110 static inline bool guest_cpuid_is_intel_compatible(struct kvm_vcpu *vcpu)
111 {
112 return !guest_cpuid_is_amd_compatible(vcpu);
113 }
114
115 static 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
126 static 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
137 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
138 {
139 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
140 }
141
142 static 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
153 static 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
161 static 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
168 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
169 {
170 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
171 }
172
173 static 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
179 static __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
187 static __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
195 static __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
203 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
204 {
205 return !!kvm_cpu_cap_get(x86_feature);
206 }
207
208 static __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
214 static __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
223 enum kvm_governed_features {
224 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x,
225 #include "governed_features.h"
226 KVM_NR_GOVERNED_FEATURES
227 };
228
229 static __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
239 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature)
240 {
241 return kvm_governed_feature_index(x86_feature) >= 0;
242 }
243
244 static __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
253 static __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
260 static __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
269 static 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
278
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