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;
37 static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
39 return (gpa >= BIT_ULL(cpuid_maxphyaddr(vcpu)));
48 static const struct cpuid_reg reverse_cpuid[] = {
49 [CPUID_1_EDX] = { 1, 0, CPUID_EDX},
50 [CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX},
51 [CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX},
52 [CPUID_1_ECX] = { 1, 0, CPUID_ECX},
53 [CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX},
54 [CPUID_8000_0001_ECX] = {0x80000001, 0, CPUID_ECX},
55 [CPUID_7_0_EBX] = { 7, 0, CPUID_EBX},
56 [CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX},
57 [CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX},
58 [CPUID_6_EAX] = { 6, 0, CPUID_EAX},
59 [CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
60 [CPUID_7_ECX] = { 7, 0, CPUID_ECX},
61 [CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
62 [CPUID_7_EDX] = { 7, 0, CPUID_EDX},
63 [CPUID_7_1_EAX] = { 7, 1, CPUID_EAX},
67 * Reverse CPUID and its derivatives can only be used for hardware-defined
68 * feature words, i.e. words whose bits directly correspond to a CPUID leaf.
69 * Retrieving a feature bit or masking guest CPUID from a Linux-defined word
70 * is nonsensical as the bit number/mask is an arbitrary software-defined value
71 * and can't be used by KVM to query/control guest capabilities. And obviously
72 * the leaf being queried must have an entry in the lookup table.
74 static __always_inline void reverse_cpuid_check(unsigned int x86_leaf)
76 BUILD_BUG_ON(x86_leaf == CPUID_LNX_1);
77 BUILD_BUG_ON(x86_leaf == CPUID_LNX_2);
78 BUILD_BUG_ON(x86_leaf == CPUID_LNX_3);
79 BUILD_BUG_ON(x86_leaf == CPUID_LNX_4);
80 BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
81 BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
85 * Retrieve the bit mask from an X86_FEATURE_* definition. Features contain
86 * the hardware defined bit number (stored in bits 4:0) and a software defined
87 * "word" (stored in bits 31:5). The word is used to index into arrays of
88 * bit masks that hold the per-cpu feature capabilities, e.g. this_cpu_has().
90 static __always_inline u32 __feature_bit(int x86_feature)
92 reverse_cpuid_check(x86_feature / 32);
93 return 1 << (x86_feature & 31);
96 #define feature_bit(name) __feature_bit(X86_FEATURE_##name)
98 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned int x86_feature)
100 unsigned int x86_leaf = x86_feature / 32;
102 reverse_cpuid_check(x86_leaf);
103 return reverse_cpuid[x86_leaf];
106 static __always_inline u32 *__cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry,
124 static __always_inline u32 *cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry,
125 unsigned int x86_feature)
127 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
129 return __cpuid_entry_get_reg(entry, cpuid.reg);
132 static __always_inline u32 cpuid_entry_get(struct kvm_cpuid_entry2 *entry,
133 unsigned int x86_feature)
135 u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
137 return *reg & __feature_bit(x86_feature);
140 static __always_inline bool cpuid_entry_has(struct kvm_cpuid_entry2 *entry,
141 unsigned int x86_feature)
143 return cpuid_entry_get(entry, x86_feature);
146 static __always_inline void cpuid_entry_clear(struct kvm_cpuid_entry2 *entry,
147 unsigned int x86_feature)
149 u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
151 *reg &= ~__feature_bit(x86_feature);
154 static __always_inline void cpuid_entry_set(struct kvm_cpuid_entry2 *entry,
155 unsigned int x86_feature)
157 u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
159 *reg |= __feature_bit(x86_feature);
162 static __always_inline void cpuid_entry_change(struct kvm_cpuid_entry2 *entry,
163 unsigned int x86_feature,
166 u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
169 * Open coded instead of using cpuid_entry_{clear,set}() to coerce the
170 * compiler into using CMOV instead of Jcc when possible.
173 *reg |= __feature_bit(x86_feature);
175 *reg &= ~__feature_bit(x86_feature);
178 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
179 enum cpuid_leafs leaf)
181 u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
183 BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
184 *reg = kvm_cpu_caps[leaf];
187 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
188 unsigned int x86_feature)
190 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
191 struct kvm_cpuid_entry2 *entry;
193 entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
197 return __cpuid_entry_get_reg(entry, cpuid.reg);
200 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
201 unsigned int x86_feature)
205 reg = guest_cpuid_get_register(vcpu, x86_feature);
209 return *reg & __feature_bit(x86_feature);
212 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
213 unsigned int x86_feature)
217 reg = guest_cpuid_get_register(vcpu, x86_feature);
219 *reg &= ~__feature_bit(x86_feature);
222 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
224 struct kvm_cpuid_entry2 *best;
226 best = kvm_find_cpuid_entry(vcpu, 0, 0);
228 (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
229 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
232 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
234 struct kvm_cpuid_entry2 *best;
236 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
240 return x86_family(best->eax);
243 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
245 struct kvm_cpuid_entry2 *best;
247 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
251 return x86_model(best->eax);
254 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
256 struct kvm_cpuid_entry2 *best;
258 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
262 return x86_stepping(best->eax);
265 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
267 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
270 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
272 return vcpu->arch.msr_misc_features_enables &
273 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
276 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
278 unsigned int x86_leaf = x86_feature / 32;
280 reverse_cpuid_check(x86_leaf);
281 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
284 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
286 unsigned int x86_leaf = x86_feature / 32;
288 reverse_cpuid_check(x86_leaf);
289 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
292 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
294 unsigned int x86_leaf = x86_feature / 32;
296 reverse_cpuid_check(x86_leaf);
297 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
300 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
302 return !!kvm_cpu_cap_get(x86_feature);
305 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
307 if (boot_cpu_has(x86_feature))
308 kvm_cpu_cap_set(x86_feature);
311 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
313 return PAGE_ALIGNED(gpa) && !(gpa >> cpuid_maxphyaddr(vcpu));