tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
51{
52 return !kvm_vcpu_is_legal_gpa(vcpu, gpa);
53}
54
55static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
56 gpa_t gpa, gpa_t alignment)
57{
58 return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
59}
60
61static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
62{
63 return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
64}
65
66static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
67 unsigned int leaf)
68{
69 u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
70
71 BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
72 *reg = kvm_cpu_caps[leaf];
73}
74
75static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
76 unsigned int x86_feature)
77{
78 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
79 struct kvm_cpuid_entry2 *entry;
80
81 entry = kvm_find_cpuid_entry_index(vcpu, cpuid.function, cpuid.index);
82 if (!entry)
83 return NULL;
84
85 return __cpuid_entry_get_reg(entry, cpuid.reg);
86}
87
88static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
89 unsigned int x86_feature)
90{
91 u32 *reg;
92
93 reg = guest_cpuid_get_register(vcpu, x86_feature);
94 if (!reg)
95 return false;
96
97 return *reg & __feature_bit(x86_feature);
98}
99
100static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
101 unsigned int x86_feature)
102{
103 u32 *reg;
104
105 reg = guest_cpuid_get_register(vcpu, x86_feature);
106 if (reg)
107 *reg &= ~__feature_bit(x86_feature);
108}
109
110static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
111{
112 struct kvm_cpuid_entry2 *best;
113
114 best = kvm_find_cpuid_entry(vcpu, 0);
115 return best &&
116 (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
117 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
118}
119
120static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu)
121{
122 struct kvm_cpuid_entry2 *best;
123
124 best = kvm_find_cpuid_entry(vcpu, 0);
125 return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx);
126}
127
128static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
129{
130 struct kvm_cpuid_entry2 *best;
131
132 best = kvm_find_cpuid_entry(vcpu, 0x1);
133 if (!best)
134 return -1;
135
136 return x86_family(best->eax);
137}
138
139static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
140{
141 struct kvm_cpuid_entry2 *best;
142
143 best = kvm_find_cpuid_entry(vcpu, 0x1);
144 if (!best)
145 return -1;
146
147 return x86_model(best->eax);
148}
149
150static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
151{
152 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
153}
154
155static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
156{
157 struct kvm_cpuid_entry2 *best;
158
159 best = kvm_find_cpuid_entry(vcpu, 0x1);
160 if (!best)
161 return -1;
162
163 return x86_stepping(best->eax);
164}
165
166static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
167{
168 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
169 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
170 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
171 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
172}
173
174static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
175{
176 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
177 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB));
178}
179
180static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
181{
182 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
183}
184
185static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
186{
187 return vcpu->arch.msr_misc_features_enables &
188 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
189}
190
191static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
192{
193 unsigned int x86_leaf = __feature_leaf(x86_feature);
194
195 reverse_cpuid_check(x86_leaf);
196 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
197}
198
199static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
200{
201 unsigned int x86_leaf = __feature_leaf(x86_feature);
202
203 reverse_cpuid_check(x86_leaf);
204 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
205}
206
207static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
208{
209 unsigned int x86_leaf = __feature_leaf(x86_feature);
210
211 reverse_cpuid_check(x86_leaf);
212 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
213}
214
215static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
216{
217 return !!kvm_cpu_cap_get(x86_feature);
218}
219
220static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
221{
222 if (boot_cpu_has(x86_feature))
223 kvm_cpu_cap_set(x86_feature);
224}
225
226static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
227 unsigned int kvm_feature)
228{
229 if (!vcpu->arch.pv_cpuid.enforce)
230 return true;
231
232 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
233}
234
235#endif