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/vmx.h>
8
9 #include "vmx_onhyperv.h"
10 #include "vmcs.h"
11 #include "../x86.h"
12
13 void vmread_error(unsigned long field);
14 void vmwrite_error(unsigned long field, unsigned long value);
15 void vmclear_error(struct vmcs *vmcs, u64 phys_addr);
16 void vmptrld_error(struct vmcs *vmcs, u64 phys_addr);
17 void invvpid_error(unsigned long ext, u16 vpid, gva_t gva);
18 void invept_error(unsigned long ext, u64 eptp, gpa_t gpa);
19
20 #ifndef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
21 /*
22 * The VMREAD error trampoline _always_ uses the stack to pass parameters, even
23 * for 64-bit targets. Preserving all registers allows the VMREAD inline asm
24 * blob to avoid clobbering GPRs, which in turn allows the compiler to better
25 * optimize sequences of VMREADs.
26 *
27 * Declare the trampoline as an opaque label as it's not safe to call from C
28 * code; there is no way to tell the compiler to pass params on the stack for
29 * 64-bit targets.
30 *
31 * void vmread_error_trampoline(unsigned long field, bool fault);
32 */
33 extern unsigned long vmread_error_trampoline;
34
35 /*
36 * The second VMREAD error trampoline, called from the assembly trampoline,
37 * exists primarily to enable instrumentation for the VM-Fail path.
38 */
39 void vmread_error_trampoline2(unsigned long field, bool fault);
40
41 #endif
42
43 static __always_inline void vmcs_check16(unsigned long field)
44 {
45 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
46 "16-bit accessor invalid for 64-bit field");
47 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
48 "16-bit accessor invalid for 64-bit high field");
49 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
50 "16-bit accessor invalid for 32-bit high field");
51 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
52 "16-bit accessor invalid for natural width field");
53 }
54
55 static __always_inline void vmcs_check32(unsigned long field)
56 {
57 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
58 "32-bit accessor invalid for 16-bit field");
59 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
60 "32-bit accessor invalid for 64-bit field");
61 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
62 "32-bit accessor invalid for 64-bit high field");
63 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
64 "32-bit accessor invalid for natural width field");
65 }
66
67 static __always_inline void vmcs_check64(unsigned long field)
68 {
69 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
70 "64-bit accessor invalid for 16-bit field");
71 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
72 "64-bit accessor invalid for 64-bit high field");
73 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
74 "64-bit accessor invalid for 32-bit field");
75 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
76 "64-bit accessor invalid for natural width field");
77 }
78
79 static __always_inline void vmcs_checkl(unsigned long field)
80 {
81 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
82 "Natural width accessor invalid for 16-bit field");
83 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
84 "Natural width accessor invalid for 64-bit field");
85 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
86 "Natural width accessor invalid for 64-bit high field");
87 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
88 "Natural width accessor invalid for 32-bit field");
89 }
90
91 static __always_inline unsigned long __vmcs_readl(unsigned long field)
92 {
93 unsigned long value;
94
95 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
96
97 asm_goto_output("1: vmread %[field], %[output]\n\t"
98 "jna %l[do_fail]\n\t"
99
100 _ASM_EXTABLE(1b, %l[do_exception])
101
102 : [output] "=r" (value)
103 : [field] "r" (field)
104 : "cc"
105 : do_fail, do_exception);
106
107 return value;
108
109 do_fail:
110 instrumentation_begin();
111 vmread_error(field);
112 instrumentation_end();
113 return 0;
114
115 do_exception:
116 kvm_spurious_fault();
117 return 0;
118
119 #else /* !CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
120
121 asm volatile("1: vmread %2, %1\n\t"
122 ".byte 0x3e\n\t" /* branch taken hint */
123 "ja 3f\n\t"
124
125 /*
126 * VMREAD failed. Push '' for @fault, push the failing
127 * @field, and bounce through the trampoline to preserve
128 * volatile registers.
129 */
130 "xorl %k1, %k1\n\t"
131 "2:\n\t"
132 "push %1\n\t"
133 "push %2\n\t"
134 "call vmread_error_trampoline\n\t"
135
136 /*
137 * Unwind the stack. Note, the trampoline zeros out the
138 * memory for @fault so that the result is '' on error.
139 */
140 "pop %2\n\t"
141 "pop %1\n\t"
142 "3:\n\t"
143
144 /* VMREAD faulted. As above, except push '1' for @fault. */
145 _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_ONE_REG, %1)
146
147 : ASM_CALL_CONSTRAINT, "=&r"(value) : "r"(field) : "cc");
148 return value;
149
150 #endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
151 }
152
153 static __always_inline u16 vmcs_read16(unsigned long field)
154 {
155 vmcs_check16(field);
156 if (kvm_is_using_evmcs())
157 return evmcs_read16(field);
158 return __vmcs_readl(field);
159 }
160
161 static __always_inline u32 vmcs_read32(unsigned long field)
162 {
163 vmcs_check32(field);
164 if (kvm_is_using_evmcs())
165 return evmcs_read32(field);
166 return __vmcs_readl(field);
167 }
168
169 static __always_inline u64 vmcs_read64(unsigned long field)
170 {
171 vmcs_check64(field);
172 if (kvm_is_using_evmcs())
173 return evmcs_read64(field);
174 #ifdef CONFIG_X86_64
175 return __vmcs_readl(field);
176 #else
177 return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
178 #endif
179 }
180
181 static __always_inline unsigned long vmcs_readl(unsigned long field)
182 {
183 vmcs_checkl(field);
184 if (kvm_is_using_evmcs())
185 return evmcs_read64(field);
186 return __vmcs_readl(field);
187 }
188
189 #define vmx_asm1(insn, op1, error_args...) \
190 do { \
191 asm goto("1: " __stringify(insn) " %0\n\t" \
192 ".byte 0x2e\n\t" /* branch not taken hint */ \
193 "jna %l[error]\n\t" \
194 _ASM_EXTABLE(1b, %l[fault]) \
195 : : op1 : "cc" : error, fault); \
196 return; \
197 error: \
198 instrumentation_begin(); \
199 insn##_error(error_args); \
200 instrumentation_end(); \
201 return; \
202 fault: \
203 kvm_spurious_fault(); \
204 } while (0)
205
206 #define vmx_asm2(insn, op1, op2, error_args...) \
207 do { \
208 asm goto("1: " __stringify(insn) " %1, %0\n\t" \
209 ".byte 0x2e\n\t" /* branch not taken hint */ \
210 "jna %l[error]\n\t" \
211 _ASM_EXTABLE(1b, %l[fault]) \
212 : : op1, op2 : "cc" : error, fault); \
213 return; \
214 error: \
215 instrumentation_begin(); \
216 insn##_error(error_args); \
217 instrumentation_end(); \
218 return; \
219 fault: \
220 kvm_spurious_fault(); \
221 } while (0)
222
223 static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
224 {
225 vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
226 }
227
228 static __always_inline void vmcs_write16(unsigned long field, u16 value)
229 {
230 vmcs_check16(field);
231 if (kvm_is_using_evmcs())
232 return evmcs_write16(field, value);
233
234 __vmcs_writel(field, value);
235 }
236
237 static __always_inline void vmcs_write32(unsigned long field, u32 value)
238 {
239 vmcs_check32(field);
240 if (kvm_is_using_evmcs())
241 return evmcs_write32(field, value);
242
243 __vmcs_writel(field, value);
244 }
245
246 static __always_inline void vmcs_write64(unsigned long field, u64 value)
247 {
248 vmcs_check64(field);
249 if (kvm_is_using_evmcs())
250 return evmcs_write64(field, value);
251
252 __vmcs_writel(field, value);
253 #ifndef CONFIG_X86_64
254 __vmcs_writel(field+1, value >> 32);
255 #endif
256 }
257
258 static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
259 {
260 vmcs_checkl(field);
261 if (kvm_is_using_evmcs())
262 return evmcs_write64(field, value);
263
264 __vmcs_writel(field, value);
265 }
266
267 static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
268 {
269 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
270 "vmcs_clear_bits does not support 64-bit fields");
271 if (kvm_is_using_evmcs())
272 return evmcs_write32(field, evmcs_read32(field) & ~mask);
273
274 __vmcs_writel(field, __vmcs_readl(field) & ~mask);
275 }
276
277 static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
278 {
279 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
280 "vmcs_set_bits does not support 64-bit fields");
281 if (kvm_is_using_evmcs())
282 return evmcs_write32(field, evmcs_read32(field) | mask);
283
284 __vmcs_writel(field, __vmcs_readl(field) | mask);
285 }
286
287 static inline void vmcs_clear(struct vmcs *vmcs)
288 {
289 u64 phys_addr = __pa(vmcs);
290
291 vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr);
292 }
293
294 static inline void vmcs_load(struct vmcs *vmcs)
295 {
296 u64 phys_addr = __pa(vmcs);
297
298 if (kvm_is_using_evmcs())
299 return evmcs_load(phys_addr);
300
301 vmx_asm1(vmptrld, "m"(phys_addr), vmcs, phys_addr);
302 }
303
304 static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
305 {
306 struct {
307 u64 vpid : 16;
308 u64 rsvd : 48;
309 u64 gva;
310 } operand = { vpid, 0, gva };
311
312 vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva);
313 }
314
315 static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
316 {
317 struct {
318 u64 eptp, gpa;
319 } operand = {eptp, gpa};
320
321 vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa);
322 }
323
324 static inline void vpid_sync_vcpu_single(int vpid)
325 {
326 if (vpid == 0)
327 return;
328
329 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
330 }
331
332 static inline void vpid_sync_vcpu_global(void)
333 {
334 __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
335 }
336
337 static inline void vpid_sync_context(int vpid)
338 {
339 if (cpu_has_vmx_invvpid_single())
340 vpid_sync_vcpu_single(vpid);
341 else if (vpid != 0)
342 vpid_sync_vcpu_global();
343 }
344
345 static inline void vpid_sync_vcpu_addr(int vpid, gva_t addr)
346 {
347 if (vpid == 0)
348 return;
349
350 if (cpu_has_vmx_invvpid_individual_addr())
351 __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
352 else
353 vpid_sync_context(vpid);
354 }
355
356 static inline void ept_sync_global(void)
357 {
358 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
359 }
360
361 static inline void ept_sync_context(u64 eptp)
362 {
363 if (cpu_has_vmx_invept_context())
364 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
365 else
366 ept_sync_global();
367 }
368
369 #endif /* __KVM_X86_VMX_INSN_H */
370
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