1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __KVM_X86_VMX_INSN_H
3 #define __KVM_X86_VMX_INSN_H
5 #include <linux/nospec.h>
13 asmlinkage void vmread_error(unsigned long field, bool fault);
14 __attribute__((regparm(0))) void vmread_error_trampoline(unsigned long field,
16 void vmwrite_error(unsigned long field, unsigned long value);
17 void vmclear_error(struct vmcs *vmcs, u64 phys_addr);
18 void vmptrld_error(struct vmcs *vmcs, u64 phys_addr);
19 void invvpid_error(unsigned long ext, u16 vpid, gva_t gva);
20 void invept_error(unsigned long ext, u64 eptp, gpa_t gpa);
22 static __always_inline void vmcs_check16(unsigned long field)
24 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
25 "16-bit accessor invalid for 64-bit field");
26 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
27 "16-bit accessor invalid for 64-bit high field");
28 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
29 "16-bit accessor invalid for 32-bit high field");
30 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
31 "16-bit accessor invalid for natural width field");
34 static __always_inline void vmcs_check32(unsigned long field)
36 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
37 "32-bit accessor invalid for 16-bit field");
38 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
39 "32-bit accessor invalid for 64-bit field");
40 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
41 "32-bit accessor invalid for 64-bit high field");
42 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
43 "32-bit accessor invalid for natural width field");
46 static __always_inline void vmcs_check64(unsigned long field)
48 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
49 "64-bit accessor invalid for 16-bit field");
50 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
51 "64-bit accessor invalid for 64-bit high field");
52 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
53 "64-bit accessor invalid for 32-bit field");
54 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
55 "64-bit accessor invalid for natural width field");
58 static __always_inline void vmcs_checkl(unsigned long field)
60 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
61 "Natural width accessor invalid for 16-bit field");
62 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
63 "Natural width accessor invalid for 64-bit field");
64 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
65 "Natural width accessor invalid for 64-bit high field");
66 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
67 "Natural width accessor invalid for 32-bit field");
70 static __always_inline unsigned long __vmcs_readl(unsigned long field)
74 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
76 asm_volatile_goto("1: vmread %[field], %[output]\n\t"
79 _ASM_EXTABLE(1b, %l[do_exception])
81 : [output] "=r" (value)
84 : do_fail, do_exception);
89 WARN_ONCE(1, "kvm: vmread failed: field=%lx\n", field);
90 pr_warn_ratelimited("kvm: vmread failed: field=%lx\n", field);
97 #else /* !CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
99 asm volatile("1: vmread %2, %1\n\t"
100 ".byte 0x3e\n\t" /* branch taken hint */
104 * VMREAD failed. Push '0' for @fault, push the failing
105 * @field, and bounce through the trampoline to preserve
106 * volatile registers.
112 "call vmread_error_trampoline\n\t"
115 * Unwind the stack. Note, the trampoline zeros out the
116 * memory for @fault so that the result is '0' on error.
122 /* VMREAD faulted. As above, except push '1' for @fault. */
123 _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_ONE_REG, %1)
125 : ASM_CALL_CONSTRAINT, "=&r"(value) : "r"(field) : "cc");
128 #endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
131 static __always_inline u16 vmcs_read16(unsigned long field)
134 if (static_branch_unlikely(&enable_evmcs))
135 return evmcs_read16(field);
136 return __vmcs_readl(field);
139 static __always_inline u32 vmcs_read32(unsigned long field)
142 if (static_branch_unlikely(&enable_evmcs))
143 return evmcs_read32(field);
144 return __vmcs_readl(field);
147 static __always_inline u64 vmcs_read64(unsigned long field)
150 if (static_branch_unlikely(&enable_evmcs))
151 return evmcs_read64(field);
153 return __vmcs_readl(field);
155 return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
159 static __always_inline unsigned long vmcs_readl(unsigned long field)
162 if (static_branch_unlikely(&enable_evmcs))
163 return evmcs_read64(field);
164 return __vmcs_readl(field);
167 #define vmx_asm1(insn, op1, error_args...) \
169 asm_volatile_goto("1: " __stringify(insn) " %0\n\t" \
170 ".byte 0x2e\n\t" /* branch not taken hint */ \
171 "jna %l[error]\n\t" \
172 _ASM_EXTABLE(1b, %l[fault]) \
173 : : op1 : "cc" : error, fault); \
176 instrumentation_begin(); \
177 insn##_error(error_args); \
178 instrumentation_end(); \
181 kvm_spurious_fault(); \
184 #define vmx_asm2(insn, op1, op2, error_args...) \
186 asm_volatile_goto("1: " __stringify(insn) " %1, %0\n\t" \
187 ".byte 0x2e\n\t" /* branch not taken hint */ \
188 "jna %l[error]\n\t" \
189 _ASM_EXTABLE(1b, %l[fault]) \
190 : : op1, op2 : "cc" : error, fault); \
193 instrumentation_begin(); \
194 insn##_error(error_args); \
195 instrumentation_end(); \
198 kvm_spurious_fault(); \
201 static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
203 vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
206 static __always_inline void vmcs_write16(unsigned long field, u16 value)
209 if (static_branch_unlikely(&enable_evmcs))
210 return evmcs_write16(field, value);
212 __vmcs_writel(field, value);
215 static __always_inline void vmcs_write32(unsigned long field, u32 value)
218 if (static_branch_unlikely(&enable_evmcs))
219 return evmcs_write32(field, value);
221 __vmcs_writel(field, value);
224 static __always_inline void vmcs_write64(unsigned long field, u64 value)
227 if (static_branch_unlikely(&enable_evmcs))
228 return evmcs_write64(field, value);
230 __vmcs_writel(field, value);
231 #ifndef CONFIG_X86_64
232 __vmcs_writel(field+1, value >> 32);
236 static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
239 if (static_branch_unlikely(&enable_evmcs))
240 return evmcs_write64(field, value);
242 __vmcs_writel(field, value);
245 static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
247 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
248 "vmcs_clear_bits does not support 64-bit fields");
249 if (static_branch_unlikely(&enable_evmcs))
250 return evmcs_write32(field, evmcs_read32(field) & ~mask);
252 __vmcs_writel(field, __vmcs_readl(field) & ~mask);
255 static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
257 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
258 "vmcs_set_bits does not support 64-bit fields");
259 if (static_branch_unlikely(&enable_evmcs))
260 return evmcs_write32(field, evmcs_read32(field) | mask);
262 __vmcs_writel(field, __vmcs_readl(field) | mask);
265 static inline void vmcs_clear(struct vmcs *vmcs)
267 u64 phys_addr = __pa(vmcs);
269 vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr);
272 static inline void vmcs_load(struct vmcs *vmcs)
274 u64 phys_addr = __pa(vmcs);
276 if (static_branch_unlikely(&enable_evmcs))
277 return evmcs_load(phys_addr);
279 vmx_asm1(vmptrld, "m"(phys_addr), vmcs, phys_addr);
282 static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
288 } operand = { vpid, 0, gva };
290 vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva);
293 static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
297 } operand = {eptp, gpa};
299 vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa);
302 static inline void vpid_sync_vcpu_single(int vpid)
307 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
310 static inline void vpid_sync_vcpu_global(void)
312 __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
315 static inline void vpid_sync_context(int vpid)
317 if (cpu_has_vmx_invvpid_single())
318 vpid_sync_vcpu_single(vpid);
320 vpid_sync_vcpu_global();
323 static inline void vpid_sync_vcpu_addr(int vpid, gva_t addr)
328 if (cpu_has_vmx_invvpid_individual_addr())
329 __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
331 vpid_sync_context(vpid);
334 static inline void ept_sync_global(void)
336 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
339 static inline void ept_sync_context(u64 eptp)
341 if (cpu_has_vmx_invept_context())
342 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
347 #endif /* __KVM_X86_VMX_INSN_H */