forked from ~ljy/RK356X_SDK_RELEASE
blame | history | patch | commit | commitdiff
hc
2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/arch/x86/kvm/cpuid.h
....@@ -5,9 +5,13 @@
55 #include "x86.h"
66 #include <asm/cpu.h>
77 #include <asm/processor.h>
8
+#include <uapi/asm/kvm_para.h>
89 
9
-int kvm_update_cpuid(struct kvm_vcpu *vcpu);
10
-bool kvm_mpx_supported(void);
10
+extern u32 kvm_cpu_caps[NCAPINTS] __read_mostly;
11
+void kvm_set_cpu_caps(void);
12
+
13
+void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
14
+void kvm_update_pv_runtime(struct kvm_vcpu *vcpu);
1115 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
1216 					      u32 function, u32 index);
1317 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
....@@ -23,13 +27,18 @@
2327 			      struct kvm_cpuid2 *cpuid,
2428 			      struct kvm_cpuid_entry2 __user *entries);
2529 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
26
-	       u32 *ecx, u32 *edx, bool check_limit);
30
+	       u32 *ecx, u32 *edx, bool exact_only);
2731 
2832 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
2933 
3034 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
3135 {
3236 	return vcpu->arch.maxphyaddr;
37
+}
38
+
39
+static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
40
+{
41
+	return (gpa >= BIT_ULL(cpuid_maxphyaddr(vcpu)));
3342 }
3443 
3544 struct cpuid_reg {
....@@ -53,28 +62,53 @@
5362 	[CPUID_7_ECX]         = {         7, 0, CPUID_ECX},
5463 	[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
5564 	[CPUID_7_EDX]         = {         7, 0, CPUID_EDX},
65
+	[CPUID_7_1_EAX]       = {         7, 1, CPUID_EAX},
5666 };
5767 
58
-static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
68
+/*
69
+ * Reverse CPUID and its derivatives can only be used for hardware-defined
70
+ * feature words, i.e. words whose bits directly correspond to a CPUID leaf.
71
+ * Retrieving a feature bit or masking guest CPUID from a Linux-defined word
72
+ * is nonsensical as the bit number/mask is an arbitrary software-defined value
73
+ * and can't be used by KVM to query/control guest capabilities.  And obviously
74
+ * the leaf being queried must have an entry in the lookup table.
75
+ */
76
+static __always_inline void reverse_cpuid_check(unsigned int x86_leaf)
5977 {
60
-	unsigned x86_leaf = x86_feature / 32;
61
-
78
+	BUILD_BUG_ON(x86_leaf == CPUID_LNX_1);
79
+	BUILD_BUG_ON(x86_leaf == CPUID_LNX_2);
80
+	BUILD_BUG_ON(x86_leaf == CPUID_LNX_3);
81
+	BUILD_BUG_ON(x86_leaf == CPUID_LNX_4);
6282 	BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
6383 	BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
84
+}
6485 
86
+/*
87
+ * Retrieve the bit mask from an X86_FEATURE_* definition.  Features contain
88
+ * the hardware defined bit number (stored in bits 4:0) and a software defined
89
+ * "word" (stored in bits 31:5).  The word is used to index into arrays of
90
+ * bit masks that hold the per-cpu feature capabilities, e.g. this_cpu_has().
91
+ */
92
+static __always_inline u32 __feature_bit(int x86_feature)
93
+{
94
+	reverse_cpuid_check(x86_feature / 32);
95
+	return 1 << (x86_feature & 31);
96
+}
97
+
98
+#define feature_bit(name)  __feature_bit(X86_FEATURE_##name)
99
+
100
+static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned int x86_feature)
101
+{
102
+	unsigned int x86_leaf = x86_feature / 32;
103
+
104
+	reverse_cpuid_check(x86_leaf);
65105 	return reverse_cpuid[x86_leaf];
66106 }
67107 
68
-static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
108
+static __always_inline u32 *__cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry,
109
+						  u32 reg)
69110 {
70
-	struct kvm_cpuid_entry2 *entry;
71
-	const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
72
-
73
-	entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
74
-	if (!entry)
75
-		return NULL;
76
-
77
-	switch (cpuid.reg) {
111
+	switch (reg) {
78112 	case CPUID_EAX:
79113 		return &entry->eax;
80114 	case CPUID_EBX:
....@@ -89,36 +123,112 @@
89123 	}
90124 }
91125 
92
-static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature)
126
+static __always_inline u32 *cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry,
127
+						unsigned int x86_feature)
93128 {
94
-	int *reg;
129
+	const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
95130 
96
-	if (x86_feature == X86_FEATURE_XSAVE &&
97
-			!static_cpu_has(X86_FEATURE_XSAVE))
98
-		return false;
131
+	return __cpuid_entry_get_reg(entry, cpuid.reg);
132
+}
133
+
134
+static __always_inline u32 cpuid_entry_get(struct kvm_cpuid_entry2 *entry,
135
+					   unsigned int x86_feature)
136
+{
137
+	u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
138
+
139
+	return *reg & __feature_bit(x86_feature);
140
+}
141
+
142
+static __always_inline bool cpuid_entry_has(struct kvm_cpuid_entry2 *entry,
143
+					    unsigned int x86_feature)
144
+{
145
+	return cpuid_entry_get(entry, x86_feature);
146
+}
147
+
148
+static __always_inline void cpuid_entry_clear(struct kvm_cpuid_entry2 *entry,
149
+					      unsigned int x86_feature)
150
+{
151
+	u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
152
+
153
+	*reg &= ~__feature_bit(x86_feature);
154
+}
155
+
156
+static __always_inline void cpuid_entry_set(struct kvm_cpuid_entry2 *entry,
157
+					    unsigned int x86_feature)
158
+{
159
+	u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
160
+
161
+	*reg |= __feature_bit(x86_feature);
162
+}
163
+
164
+static __always_inline void cpuid_entry_change(struct kvm_cpuid_entry2 *entry,
165
+					       unsigned int x86_feature,
166
+					       bool set)
167
+{
168
+	u32 *reg = cpuid_entry_get_reg(entry, x86_feature);
169
+
170
+	/*
171
+	 * Open coded instead of using cpuid_entry_{clear,set}() to coerce the
172
+	 * compiler into using CMOV instead of Jcc when possible.
173
+	 */
174
+	if (set)
175
+		*reg |= __feature_bit(x86_feature);
176
+	else
177
+		*reg &= ~__feature_bit(x86_feature);
178
+}
179
+
180
+static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
181
+						 enum cpuid_leafs leaf)
182
+{
183
+	u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
184
+
185
+	BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
186
+	*reg = kvm_cpu_caps[leaf];
187
+}
188
+
189
+static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
190
+						     unsigned int x86_feature)
191
+{
192
+	const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
193
+	struct kvm_cpuid_entry2 *entry;
194
+
195
+	entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
196
+	if (!entry)
197
+		return NULL;
198
+
199
+	return __cpuid_entry_get_reg(entry, cpuid.reg);
200
+}
201
+
202
+static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
203
+					    unsigned int x86_feature)
204
+{
205
+	u32 *reg;
99206 
100207 	reg = guest_cpuid_get_register(vcpu, x86_feature);
101208 	if (!reg)
102209 		return false;
103210 
104
-	return *reg & bit(x86_feature);
211
+	return *reg & __feature_bit(x86_feature);
105212 }
106213 
107
-static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
214
+static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
215
+					      unsigned int x86_feature)
108216 {
109
-	int *reg;
217
+	u32 *reg;
110218 
111219 	reg = guest_cpuid_get_register(vcpu, x86_feature);
112220 	if (reg)
113
-		*reg &= ~bit(x86_feature);
221
+		*reg &= ~__feature_bit(x86_feature);
114222 }
115223 
116
-static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
224
+static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
117225 {
118226 	struct kvm_cpuid_entry2 *best;
119227 
120228 	best = kvm_find_cpuid_entry(vcpu, 0, 0);
121
-	return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
229
+	return best &&
230
+	       (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
231
+		is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
122232 }
123233 
124234 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
....@@ -179,4 +289,53 @@
179289 		  MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
180290 }
181291 
292
+static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
293
+{
294
+	unsigned int x86_leaf = x86_feature / 32;
295
+
296
+	reverse_cpuid_check(x86_leaf);
297
+	kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
298
+}
299
+
300
+static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
301
+{
302
+	unsigned int x86_leaf = x86_feature / 32;
303
+
304
+	reverse_cpuid_check(x86_leaf);
305
+	kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
306
+}
307
+
308
+static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
309
+{
310
+	unsigned int x86_leaf = x86_feature / 32;
311
+
312
+	reverse_cpuid_check(x86_leaf);
313
+	return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
314
+}
315
+
316
+static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
317
+{
318
+	return !!kvm_cpu_cap_get(x86_feature);
319
+}
320
+
321
+static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
322
+{
323
+	if (boot_cpu_has(x86_feature))
324
+		kvm_cpu_cap_set(x86_feature);
325
+}
326
+
327
+static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
328
+{
329
+	return PAGE_ALIGNED(gpa) && !(gpa >> cpuid_maxphyaddr(vcpu));
330
+}
331
+
332
+static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
333
+					 unsigned int kvm_feature)
334
+{
335
+	if (!vcpu->arch.pv_cpuid.enforce)
336
+		return true;
337
+
338
+	return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
339
+}
340
+
182341 #endif