1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef ARCH_X86_KVM_CPUID_H
3 #define ARCH_X86_KVM_CPUID_H
7 #include <asm/processor.h>
9 extern u32 kvm_cpu_caps[NCAPINTS] __read_mostly;
10 void kvm_set_cpu_caps(void);
12 void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
13 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
14 u32 function, u32 index);
15 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
16 struct kvm_cpuid_entry2 __user *entries,
18 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
19 struct kvm_cpuid *cpuid,
20 struct kvm_cpuid_entry __user *entries);
21 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
22 struct kvm_cpuid2 *cpuid,
23 struct kvm_cpuid_entry2 __user *entries);
24 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
25 struct kvm_cpuid2 *cpuid,
26 struct kvm_cpuid_entry2 __user *entries);
27 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
28 u32 *ecx, u32 *edx, bool exact_only);
30 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
32 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
34 return vcpu->arch.maxphyaddr;
43 static const struct cpuid_reg reverse_cpuid[] = {
44 [CPUID_1_EDX] = { 1, 0, CPUID_EDX},
45 [CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX},
46 [CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX},
47 [CPUID_1_ECX] = { 1, 0, CPUID_ECX},
48 [CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX},
49 [CPUID_8000_0001_ECX] = {0x80000001, 0, CPUID_ECX},
50 [CPUID_7_0_EBX] = { 7, 0, CPUID_EBX},
51 [CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX},
52 [CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX},
53 [CPUID_6_EAX] = { 6, 0, CPUID_EAX},
54 [CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
55 [CPUID_7_ECX] = { 7, 0, CPUID_ECX},
56 [CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
57 [CPUID_7_EDX] = { 7, 0, CPUID_EDX},
58 [CPUID_7_1_EAX] = { 7, 1, CPUID_EAX},
62 * Reverse CPUID and its derivatives can only be used for hardware-defined
63 * feature words, i.e. words whose bits directly correspond to a CPUID leaf.
64 * Retrieving a feature bit or masking guest CPUID from a Linux-defined word
65 * is nonsensical as the bit number/mask is an arbitrary software-defined value
66 * and can't be used by KVM to query/control guest capabilities. And obviously
67 * the leaf being queried must have an entry in the lookup table.
69 static __always_inline void reverse_cpuid_check(unsigned int x86_leaf)
71 BUILD_BUG_ON(x86_leaf == CPUID_LNX_1);
72 BUILD_BUG_ON(x86_leaf == CPUID_LNX_2);
73 BUILD_BUG_ON(x86_leaf == CPUID_LNX_3);
74 BUILD_BUG_ON(x86_leaf == CPUID_LNX_4);
75 BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
76 BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
80 * Retrieve the bit mask from an X86_FEATURE_* definition. Features contain
81 * the hardware defined bit number (stored in bits 4:0) and a software defined
82 * "word" (stored in bits 31:5). The word is used to index into arrays of
83 * bit masks that hold the per-cpu feature capabilities, e.g. this_cpu_has().
85 static __always_inline u32 __feature_bit(int x86_feature)
87 reverse_cpuid_check(x86_feature / 32);
88 return 1 << (x86_feature & 31);
91 #define feature_bit(name) __feature_bit(X86_FEATURE_##name)
93 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned int x86_feature)
95 unsigned int x86_leaf = x86_feature / 32;
97 reverse_cpuid_check(x86_leaf);
98 return reverse_cpuid[x86_leaf];
101 static __always_inline u32 *__cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry,
119 static __always_inline u32 *cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry,
120 unsigned int x86_feature)
122 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
124 return __cpuid_entry_get_reg(entry, cpuid.reg);
127 static __always_inline u32 cpuid_entry_get(struct kvm_cpuid_entry2 *entry,
128 unsigned int x86_feature)
130 u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
132 return *reg & __feature_bit(x86_feature);
135 static __always_inline bool cpuid_entry_has(struct kvm_cpuid_entry2 *entry,
136 unsigned int x86_feature)
138 return cpuid_entry_get(entry, x86_feature);
141 static __always_inline void cpuid_entry_clear(struct kvm_cpuid_entry2 *entry,
142 unsigned int x86_feature)
144 u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
146 *reg &= ~__feature_bit(x86_feature);
149 static __always_inline void cpuid_entry_set(struct kvm_cpuid_entry2 *entry,
150 unsigned int x86_feature)
152 u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
154 *reg |= __feature_bit(x86_feature);
157 static __always_inline void cpuid_entry_change(struct kvm_cpuid_entry2 *entry,
158 unsigned int x86_feature,
161 u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
164 * Open coded instead of using cpuid_entry_{clear,set}() to coerce the
165 * compiler into using CMOV instead of Jcc when possible.
168 *reg |= __feature_bit(x86_feature);
170 *reg &= ~__feature_bit(x86_feature);
173 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
174 enum cpuid_leafs leaf)
176 u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
178 BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
179 *reg = kvm_cpu_caps[leaf];
182 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
183 unsigned int x86_feature)
185 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
186 struct kvm_cpuid_entry2 *entry;
188 entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
192 return __cpuid_entry_get_reg(entry, cpuid.reg);
195 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
196 unsigned int x86_feature)
200 reg = guest_cpuid_get_register(vcpu, x86_feature);
204 return *reg & __feature_bit(x86_feature);
207 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
208 unsigned int x86_feature)
212 reg = guest_cpuid_get_register(vcpu, x86_feature);
214 *reg &= ~__feature_bit(x86_feature);
217 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
219 struct kvm_cpuid_entry2 *best;
221 best = kvm_find_cpuid_entry(vcpu, 0, 0);
223 (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
224 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
227 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
229 struct kvm_cpuid_entry2 *best;
231 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
235 return x86_family(best->eax);
238 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
240 struct kvm_cpuid_entry2 *best;
242 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
246 return x86_model(best->eax);
249 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
251 struct kvm_cpuid_entry2 *best;
253 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
257 return x86_stepping(best->eax);
260 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
262 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
265 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
267 return vcpu->arch.msr_misc_features_enables &
268 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
271 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
273 unsigned int x86_leaf = x86_feature / 32;
275 reverse_cpuid_check(x86_leaf);
276 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
279 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
281 unsigned int x86_leaf = x86_feature / 32;
283 reverse_cpuid_check(x86_leaf);
284 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
287 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
289 unsigned int x86_leaf = x86_feature / 32;
291 reverse_cpuid_check(x86_leaf);
292 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
295 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
297 return !!kvm_cpu_cap_get(x86_feature);
300 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
302 if (boot_cpu_has(x86_feature))
303 kvm_cpu_cap_set(x86_feature);
306 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
308 return PAGE_ALIGNED(gpa) && !(gpa >> cpuid_maxphyaddr(vcpu));