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 asm volatile("1: vmread %2, %1\n\t"
75 ".byte 0x3e\n\t" /* branch taken hint */
79 * VMREAD failed. Push '0' for @fault, push the failing
80 * @field, and bounce through the trampoline to preserve
85 "2:call vmread_error_trampoline\n\t"
88 * Unwind the stack. Note, the trampoline zeros out the
89 * memory for @fault so that the result is '0' on error.
95 /* VMREAD faulted. As above, except push '1' for @fault. */
96 ".pushsection .fixup, \"ax\"\n\t"
102 : ASM_CALL_CONSTRAINT, "=r"(value) : "r"(field) : "cc");
106 static __always_inline u16 vmcs_read16(unsigned long field)
109 if (static_branch_unlikely(&enable_evmcs))
110 return evmcs_read16(field);
111 return __vmcs_readl(field);
114 static __always_inline u32 vmcs_read32(unsigned long field)
117 if (static_branch_unlikely(&enable_evmcs))
118 return evmcs_read32(field);
119 return __vmcs_readl(field);
122 static __always_inline u64 vmcs_read64(unsigned long field)
125 if (static_branch_unlikely(&enable_evmcs))
126 return evmcs_read64(field);
128 return __vmcs_readl(field);
130 return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
134 static __always_inline unsigned long vmcs_readl(unsigned long field)
137 if (static_branch_unlikely(&enable_evmcs))
138 return evmcs_read64(field);
139 return __vmcs_readl(field);
142 #define vmx_asm1(insn, op1, error_args...) \
144 asm_volatile_goto("1: " __stringify(insn) " %0\n\t" \
145 ".byte 0x2e\n\t" /* branch not taken hint */ \
146 "jna %l[error]\n\t" \
147 _ASM_EXTABLE(1b, %l[fault]) \
148 : : op1 : "cc" : error, fault); \
151 instrumentation_begin(); \
152 insn##_error(error_args); \
153 instrumentation_end(); \
156 kvm_spurious_fault(); \
159 #define vmx_asm2(insn, op1, op2, error_args...) \
161 asm_volatile_goto("1: " __stringify(insn) " %1, %0\n\t" \
162 ".byte 0x2e\n\t" /* branch not taken hint */ \
163 "jna %l[error]\n\t" \
164 _ASM_EXTABLE(1b, %l[fault]) \
165 : : op1, op2 : "cc" : error, fault); \
168 instrumentation_begin(); \
169 insn##_error(error_args); \
170 instrumentation_end(); \
173 kvm_spurious_fault(); \
176 static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
178 vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
181 static __always_inline void vmcs_write16(unsigned long field, u16 value)
184 if (static_branch_unlikely(&enable_evmcs))
185 return evmcs_write16(field, value);
187 __vmcs_writel(field, value);
190 static __always_inline void vmcs_write32(unsigned long field, u32 value)
193 if (static_branch_unlikely(&enable_evmcs))
194 return evmcs_write32(field, value);
196 __vmcs_writel(field, value);
199 static __always_inline void vmcs_write64(unsigned long field, u64 value)
202 if (static_branch_unlikely(&enable_evmcs))
203 return evmcs_write64(field, value);
205 __vmcs_writel(field, value);
206 #ifndef CONFIG_X86_64
207 __vmcs_writel(field+1, value >> 32);
211 static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
214 if (static_branch_unlikely(&enable_evmcs))
215 return evmcs_write64(field, value);
217 __vmcs_writel(field, value);
220 static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
222 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
223 "vmcs_clear_bits does not support 64-bit fields");
224 if (static_branch_unlikely(&enable_evmcs))
225 return evmcs_write32(field, evmcs_read32(field) & ~mask);
227 __vmcs_writel(field, __vmcs_readl(field) & ~mask);
230 static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
232 BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
233 "vmcs_set_bits does not support 64-bit fields");
234 if (static_branch_unlikely(&enable_evmcs))
235 return evmcs_write32(field, evmcs_read32(field) | mask);
237 __vmcs_writel(field, __vmcs_readl(field) | mask);
240 static inline void vmcs_clear(struct vmcs *vmcs)
242 u64 phys_addr = __pa(vmcs);
244 vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr);
247 static inline void vmcs_load(struct vmcs *vmcs)
249 u64 phys_addr = __pa(vmcs);
251 if (static_branch_unlikely(&enable_evmcs))
252 return evmcs_load(phys_addr);
254 vmx_asm1(vmptrld, "m"(phys_addr), vmcs, phys_addr);
257 static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
263 } operand = { vpid, 0, gva };
265 vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva);
268 static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
272 } operand = {eptp, gpa};
274 vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa);
277 static inline void vpid_sync_vcpu_single(int vpid)
282 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
285 static inline void vpid_sync_vcpu_global(void)
287 __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
290 static inline void vpid_sync_context(int vpid)
292 if (cpu_has_vmx_invvpid_single())
293 vpid_sync_vcpu_single(vpid);
295 vpid_sync_vcpu_global();
298 static inline void vpid_sync_vcpu_addr(int vpid, gva_t addr)
303 if (cpu_has_vmx_invvpid_individual_addr())
304 __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
306 vpid_sync_context(vpid);
309 static inline void ept_sync_global(void)
311 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
314 static inline void ept_sync_context(u64 eptp)
316 if (cpu_has_vmx_invept_context())
317 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
322 #endif /* __KVM_X86_VMX_INSN_H */