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 <asm/cpu.h>
7 #include <asm/processor.h>
8
9 int kvm_update_cpuid(struct kvm_vcpu *vcpu);
10 bool kvm_mpx_supported(void);
11 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
12 u32 function, u32 index);
13 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
14 struct kvm_cpuid_entry2 __user *entries,
15 unsigned int type);
16 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
17 struct kvm_cpuid *cpuid,
18 struct kvm_cpuid_entry __user *entries);
19 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
20 struct kvm_cpuid2 *cpuid,
21 struct kvm_cpuid_entry2 __user *entries);
22 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
23 struct kvm_cpuid2 *cpuid,
24 struct kvm_cpuid_entry2 __user *entries);
25 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
26 u32 *ecx, u32 *edx, bool check_limit);
27
28 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
29
cpuid_maxphyaddr(struct kvm_vcpu * vcpu)30 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
31 {
32 return vcpu->arch.maxphyaddr;
33 }
34
35 struct cpuid_reg {
36 u32 function;
37 u32 index;
38 int reg;
39 };
40
41 static const struct cpuid_reg reverse_cpuid[] = {
42 [CPUID_1_EDX] = { 1, 0, CPUID_EDX},
43 [CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX},
44 [CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX},
45 [CPUID_1_ECX] = { 1, 0, CPUID_ECX},
46 [CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX},
47 [CPUID_8000_0001_ECX] = {0x80000001, 0, CPUID_ECX},
48 [CPUID_7_0_EBX] = { 7, 0, CPUID_EBX},
49 [CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX},
50 [CPUID_F_0_EDX] = { 0xf, 0, CPUID_EDX},
51 [CPUID_F_1_EDX] = { 0xf, 1, CPUID_EDX},
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 };
59
x86_feature_cpuid(unsigned x86_feature)60 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
61 {
62 unsigned x86_leaf = x86_feature / 32;
63
64 BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
65 BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
66
67 return reverse_cpuid[x86_leaf];
68 }
69
guest_cpuid_get_register(struct kvm_vcpu * vcpu,unsigned x86_feature)70 static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
71 {
72 struct kvm_cpuid_entry2 *entry;
73 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
74
75 entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
76 if (!entry)
77 return NULL;
78
79 switch (cpuid.reg) {
80 case CPUID_EAX:
81 return &entry->eax;
82 case CPUID_EBX:
83 return &entry->ebx;
84 case CPUID_ECX:
85 return &entry->ecx;
86 case CPUID_EDX:
87 return &entry->edx;
88 default:
89 BUILD_BUG();
90 return NULL;
91 }
92 }
93
guest_cpuid_has(struct kvm_vcpu * vcpu,unsigned x86_feature)94 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature)
95 {
96 int *reg;
97
98 if (x86_feature == X86_FEATURE_XSAVE &&
99 !static_cpu_has(X86_FEATURE_XSAVE))
100 return false;
101
102 reg = guest_cpuid_get_register(vcpu, x86_feature);
103 if (!reg)
104 return false;
105
106 return *reg & bit(x86_feature);
107 }
108
guest_cpuid_clear(struct kvm_vcpu * vcpu,unsigned x86_feature)109 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
110 {
111 int *reg;
112
113 reg = guest_cpuid_get_register(vcpu, x86_feature);
114 if (reg)
115 *reg &= ~bit(x86_feature);
116 }
117
guest_cpuid_is_amd(struct kvm_vcpu * vcpu)118 static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
119 {
120 struct kvm_cpuid_entry2 *best;
121
122 best = kvm_find_cpuid_entry(vcpu, 0, 0);
123 return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
124 }
125
guest_cpuid_family(struct kvm_vcpu * vcpu)126 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
127 {
128 struct kvm_cpuid_entry2 *best;
129
130 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
131 if (!best)
132 return -1;
133
134 return x86_family(best->eax);
135 }
136
guest_cpuid_model(struct kvm_vcpu * vcpu)137 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
138 {
139 struct kvm_cpuid_entry2 *best;
140
141 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
142 if (!best)
143 return -1;
144
145 return x86_model(best->eax);
146 }
147
guest_cpuid_stepping(struct kvm_vcpu * vcpu)148 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
149 {
150 struct kvm_cpuid_entry2 *best;
151
152 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
153 if (!best)
154 return -1;
155
156 return x86_stepping(best->eax);
157 }
158
supports_cpuid_fault(struct kvm_vcpu * vcpu)159 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
160 {
161 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
162 }
163
cpuid_fault_enabled(struct kvm_vcpu * vcpu)164 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
165 {
166 return vcpu->arch.msr_misc_features_enables &
167 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
168 }
169
170 #endif
171
