1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __KVM_X86_VMX_INSN_H
3 #define __KVM_X86_VMX_INSN_H
4
5 #include <linux/nospec.h>
6
7 #include <asm/kvm_host.h>
8 #include <asm/vmx.h>
9
10 #include "evmcs.h"
11 #include "vmcs.h"
12
13 #define __ex(x) __kvm_handle_fault_on_reboot(x)
14
15 asmlinkage void vmread_error(unsigned long field, bool fault);
16 __attribute__((regparm(0))) void vmread_error_trampoline(unsigned long field,
17 bool fault);
18 void vmwrite_error(unsigned long field, unsigned long value);
19 void vmclear_error(struct vmcs *vmcs, u64 phys_addr);
20 void vmptrld_error(struct vmcs *vmcs, u64 phys_addr);
21 void invvpid_error(unsigned long ext, u16 vpid, gva_t gva);
22 void invept_error(unsigned long ext, u64 eptp, gpa_t gpa);
23
vmcs_check16(unsigned long field)24 static __always_inline void vmcs_check16(unsigned long field)
25 {
26 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
27 "16-bit accessor invalid for 64-bit field");
28 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
29 "16-bit accessor invalid for 64-bit high field");
30 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
31 "16-bit accessor invalid for 32-bit high field");
32 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
33 "16-bit accessor invalid for natural width field");
34 }
35
vmcs_check32(unsigned long field)36 static __always_inline void vmcs_check32(unsigned long field)
37 {
38 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
39 "32-bit accessor invalid for 16-bit field");
40 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
41 "32-bit accessor invalid for natural width field");
42 }
43
vmcs_check64(unsigned long field)44 static __always_inline void vmcs_check64(unsigned long field)
45 {
46 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
47 "64-bit accessor invalid for 16-bit field");
48 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
49 "64-bit accessor invalid for 64-bit high field");
50 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
51 "64-bit accessor invalid for 32-bit field");
52 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
53 "64-bit accessor invalid for natural width field");
54 }
55
vmcs_checkl(unsigned long field)56 static __always_inline void vmcs_checkl(unsigned long field)
57 {
58 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
59 "Natural width accessor invalid for 16-bit field");
60 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
61 "Natural width accessor invalid for 64-bit field");
62 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
63 "Natural width accessor invalid for 64-bit high field");
64 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
65 "Natural width accessor invalid for 32-bit field");
66 }
67
__vmcs_readl(unsigned long field)68 static __always_inline unsigned long __vmcs_readl(unsigned long field)
69 {
70 unsigned long value;
71
72 asm volatile("1: vmread %2, %1\n\t"
73 ".byte 0x3e\n\t" /* branch taken hint */
74 "ja 3f\n\t"
75
76 /*
77 * VMREAD failed. Push '0' for @fault, push the failing
78 * @field, and bounce through the trampoline to preserve
79 * volatile registers.
80 */
81 "push $0\n\t"
82 "push %2\n\t"
83 "2:call vmread_error_trampoline\n\t"
84
85 /*
86 * Unwind the stack. Note, the trampoline zeros out the
87 * memory for @fault so that the result is '0' on error.
88 */
89 "pop %2\n\t"
90 "pop %1\n\t"
91 "3:\n\t"
92
93 /* VMREAD faulted. As above, except push '1' for @fault. */
94 ".pushsection .fixup, \"ax\"\n\t"
95 "4: push $1\n\t"
96 "push %2\n\t"
97 "jmp 2b\n\t"
98 ".popsection\n\t"
99 _ASM_EXTABLE(1b, 4b)
100 : ASM_CALL_CONSTRAINT, "=r"(value) : "r"(field) : "cc");
101 return value;
102 }
103
vmcs_read16(unsigned long field)104 static __always_inline u16 vmcs_read16(unsigned long field)
105 {
106 vmcs_check16(field);
107 if (static_branch_unlikely(&enable_evmcs))
108 return evmcs_read16(field);
109 return __vmcs_readl(field);
110 }
111
vmcs_read32(unsigned long field)112 static __always_inline u32 vmcs_read32(unsigned long field)
113 {
114 vmcs_check32(field);
115 if (static_branch_unlikely(&enable_evmcs))
116 return evmcs_read32(field);
117 return __vmcs_readl(field);
118 }
119
vmcs_read64(unsigned long field)120 static __always_inline u64 vmcs_read64(unsigned long field)
121 {
122 vmcs_check64(field);
123 if (static_branch_unlikely(&enable_evmcs))
124 return evmcs_read64(field);
125 #ifdef CONFIG_X86_64
126 return __vmcs_readl(field);
127 #else
128 return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
129 #endif
130 }
131
vmcs_readl(unsigned long field)132 static __always_inline unsigned long vmcs_readl(unsigned long field)
133 {
134 vmcs_checkl(field);
135 if (static_branch_unlikely(&enable_evmcs))
136 return evmcs_read64(field);
137 return __vmcs_readl(field);
138 }
139
140 #define vmx_asm1(insn, op1, error_args...) \
141 do { \
142 asm_volatile_goto("1: " __stringify(insn) " %0\n\t" \
143 ".byte 0x2e\n\t" /* branch not taken hint */ \
144 "jna %l[error]\n\t" \
145 _ASM_EXTABLE(1b, %l[fault]) \
146 : : op1 : "cc" : error, fault); \
147 return; \
148 error: \
149 instrumentation_begin(); \
150 insn##_error(error_args); \
151 instrumentation_end(); \
152 return; \
153 fault: \
154 kvm_spurious_fault(); \
155 } while (0)
156
157 #define vmx_asm2(insn, op1, op2, error_args...) \
158 do { \
159 asm_volatile_goto("1: " __stringify(insn) " %1, %0\n\t" \
160 ".byte 0x2e\n\t" /* branch not taken hint */ \
161 "jna %l[error]\n\t" \
162 _ASM_EXTABLE(1b, %l[fault]) \
163 : : op1, op2 : "cc" : error, fault); \
164 return; \
165 error: \
166 instrumentation_begin(); \
167 insn##_error(error_args); \
168 instrumentation_end(); \
169 return; \
170 fault: \
171 kvm_spurious_fault(); \
172 } while (0)
173
__vmcs_writel(unsigned long field,unsigned long value)174 static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
175 {
176 vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
177 }
178
vmcs_write16(unsigned long field,u16 value)179 static __always_inline void vmcs_write16(unsigned long field, u16 value)
180 {
181 vmcs_check16(field);
182 if (static_branch_unlikely(&enable_evmcs))
183 return evmcs_write16(field, value);
184
185 __vmcs_writel(field, value);
186 }
187
vmcs_write32(unsigned long field,u32 value)188 static __always_inline void vmcs_write32(unsigned long field, u32 value)
189 {
190 vmcs_check32(field);
191 if (static_branch_unlikely(&enable_evmcs))
192 return evmcs_write32(field, value);
193
194 __vmcs_writel(field, value);
195 }
196
vmcs_write64(unsigned long field,u64 value)197 static __always_inline void vmcs_write64(unsigned long field, u64 value)
198 {
199 vmcs_check64(field);
200 if (static_branch_unlikely(&enable_evmcs))
201 return evmcs_write64(field, value);
202
203 __vmcs_writel(field, value);
204 #ifndef CONFIG_X86_64
205 __vmcs_writel(field+1, value >> 32);
206 #endif
207 }
208
vmcs_writel(unsigned long field,unsigned long value)209 static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
210 {
211 vmcs_checkl(field);
212 if (static_branch_unlikely(&enable_evmcs))
213 return evmcs_write64(field, value);
214
215 __vmcs_writel(field, value);
216 }
217
vmcs_clear_bits(unsigned long field,u32 mask)218 static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
219 {
220 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
221 "vmcs_clear_bits does not support 64-bit fields");
222 if (static_branch_unlikely(&enable_evmcs))
223 return evmcs_write32(field, evmcs_read32(field) & ~mask);
224
225 __vmcs_writel(field, __vmcs_readl(field) & ~mask);
226 }
227
vmcs_set_bits(unsigned long field,u32 mask)228 static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
229 {
230 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
231 "vmcs_set_bits does not support 64-bit fields");
232 if (static_branch_unlikely(&enable_evmcs))
233 return evmcs_write32(field, evmcs_read32(field) | mask);
234
235 __vmcs_writel(field, __vmcs_readl(field) | mask);
236 }
237
vmcs_clear(struct vmcs * vmcs)238 static inline void vmcs_clear(struct vmcs *vmcs)
239 {
240 u64 phys_addr = __pa(vmcs);
241
242 vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr);
243 }
244
vmcs_load(struct vmcs * vmcs)245 static inline void vmcs_load(struct vmcs *vmcs)
246 {
247 u64 phys_addr = __pa(vmcs);
248
249 if (static_branch_unlikely(&enable_evmcs))
250 return evmcs_load(phys_addr);
251
252 vmx_asm1(vmptrld, "m"(phys_addr), vmcs, phys_addr);
253 }
254
__invvpid(unsigned long ext,u16 vpid,gva_t gva)255 static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
256 {
257 struct {
258 u64 vpid : 16;
259 u64 rsvd : 48;
260 u64 gva;
261 } operand = { vpid, 0, gva };
262
263 vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva);
264 }
265
__invept(unsigned long ext,u64 eptp,gpa_t gpa)266 static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
267 {
268 struct {
269 u64 eptp, gpa;
270 } operand = {eptp, gpa};
271
272 vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa);
273 }
274
vpid_sync_vcpu_single(int vpid)275 static inline void vpid_sync_vcpu_single(int vpid)
276 {
277 if (vpid == 0)
278 return;
279
280 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
281 }
282
vpid_sync_vcpu_global(void)283 static inline void vpid_sync_vcpu_global(void)
284 {
285 __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
286 }
287
vpid_sync_context(int vpid)288 static inline void vpid_sync_context(int vpid)
289 {
290 if (cpu_has_vmx_invvpid_single())
291 vpid_sync_vcpu_single(vpid);
292 else if (vpid != 0)
293 vpid_sync_vcpu_global();
294 }
295
vpid_sync_vcpu_addr(int vpid,gva_t addr)296 static inline void vpid_sync_vcpu_addr(int vpid, gva_t addr)
297 {
298 if (vpid == 0)
299 return;
300
301 if (cpu_has_vmx_invvpid_individual_addr())
302 __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
303 else
304 vpid_sync_context(vpid);
305 }
306
ept_sync_global(void)307 static inline void ept_sync_global(void)
308 {
309 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
310 }
311
ept_sync_context(u64 eptp)312 static inline void ept_sync_context(u64 eptp)
313 {
314 if (cpu_has_vmx_invept_context())
315 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
316 else
317 ept_sync_global();
318 }
319
320 #endif /* __KVM_X86_VMX_INSN_H */
321
