arch/x86/kvm/vmx/vmx_ops.h

   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 "evmcs.h"
  10 #include "vmcs.h"
  11 #include "x86.h"
  12
  13 asmlinkage void vmread_error(unsigned long field, bool fault);
  14 __attribute__((regparm(0))) void vmread_error_trampoline(unsigned long field,
  15                                                          bool fault);
  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);
  21
  22 static __always_inline void vmcs_check16(unsigned long field)
  23 {
  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");
  32 }
  33
  34 static __always_inline void vmcs_check32(unsigned long field)
  35 {
  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");
  44 }
  45
  46 static __always_inline void vmcs_check64(unsigned long field)
  47 {
  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");
  56 }
  57
  58 static __always_inline void vmcs_checkl(unsigned long field)
  59 {
  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");
  68 }
  69
  70 static __always_inline unsigned long __vmcs_readl(unsigned long field)
  71 {
  72         unsigned long value;
  73
  74 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
  75
  76         asm_volatile_goto("1: vmread %[field], %[output]\n\t"
  77                           "jna %l[do_fail]\n\t"
  78
  79                           _ASM_EXTABLE(1b, %l[do_exception])
  80
  81                           : [output] "=r" (value)
  82                           : [field] "r" (field)
  83                           : "cc"
  84                           : do_fail, do_exception);
  85
  86         return value;
  87
  88 do_fail:
  89         WARN_ONCE(1, "kvm: vmread failed: field=%lx\n", field);
  90         pr_warn_ratelimited("kvm: vmread failed: field=%lx\n", field);
  91         return 0;
  92
  93 do_exception:
  94         kvm_spurious_fault();
  95         return 0;
  96
  97 #else /* !CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
  98
  99         asm volatile("1: vmread %2, %1\n\t"
 100                      ".byte 0x3e\n\t" /* branch taken hint */
 101                      "ja 3f\n\t"
 102
 103                      /*
 104                       * VMREAD failed.  Push '0' for @fault, push the failing
 105                       * @field, and bounce through the trampoline to preserve
 106                       * volatile registers.
 107                       */
 108                      "xorl %k1, %k1\n\t"
 109                      "2:\n\t"
 110                      "push %1\n\t"
 111                      "push %2\n\t"
 112                      "call vmread_error_trampoline\n\t"
 113
 114                      /*
 115                       * Unwind the stack.  Note, the trampoline zeros out the
 116                       * memory for @fault so that the result is '0' on error.
 117                       */
 118                      "pop %2\n\t"
 119                      "pop %1\n\t"
 120                      "3:\n\t"
 121
 122                      /* VMREAD faulted.  As above, except push '1' for @fault. */
 123                      _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_ONE_REG, %1)
 124
 125                      : ASM_CALL_CONSTRAINT, "=&r"(value) : "r"(field) : "cc");
 126         return value;
 127
 128 #endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
 129 }
 130
 131 static __always_inline u16 vmcs_read16(unsigned long field)
 132 {
 133         vmcs_check16(field);
 134         if (static_branch_unlikely(&enable_evmcs))
 135                 return evmcs_read16(field);
 136         return __vmcs_readl(field);
 137 }
 138
 139 static __always_inline u32 vmcs_read32(unsigned long field)
 140 {
 141         vmcs_check32(field);
 142         if (static_branch_unlikely(&enable_evmcs))
 143                 return evmcs_read32(field);
 144         return __vmcs_readl(field);
 145 }
 146
 147 static __always_inline u64 vmcs_read64(unsigned long field)
 148 {
 149         vmcs_check64(field);
 150         if (static_branch_unlikely(&enable_evmcs))
 151                 return evmcs_read64(field);
 152 #ifdef CONFIG_X86_64
 153         return __vmcs_readl(field);
 154 #else
 155         return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
 156 #endif
 157 }
 158
 159 static __always_inline unsigned long vmcs_readl(unsigned long field)
 160 {
 161         vmcs_checkl(field);
 162         if (static_branch_unlikely(&enable_evmcs))
 163                 return evmcs_read64(field);
 164         return __vmcs_readl(field);
 165 }
 166
 167 #define vmx_asm1(insn, op1, error_args...)                              \
 168 do {                                                                    \
 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);               \
 174         return;                                                         \
 175 error:                                                                  \
 176         instrumentation_begin();                                        \
 177         insn##_error(error_args);                                       \
 178         instrumentation_end();                                          \
 179         return;                                                         \
 180 fault:                                                                  \
 181         kvm_spurious_fault();                                           \
 182 } while (0)
 183
 184 #define vmx_asm2(insn, op1, op2, error_args...)                         \
 185 do {                                                                    \
 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);          \
 191         return;                                                         \
 192 error:                                                                  \
 193         instrumentation_begin();                                        \
 194         insn##_error(error_args);                                       \
 195         instrumentation_end();                                          \
 196         return;                                                         \
 197 fault:                                                                  \
 198         kvm_spurious_fault();                                           \
 199 } while (0)
 200
 201 static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
 202 {
 203         vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
 204 }
 205
 206 static __always_inline void vmcs_write16(unsigned long field, u16 value)
 207 {
 208         vmcs_check16(field);
 209         if (static_branch_unlikely(&enable_evmcs))
 210                 return evmcs_write16(field, value);
 211
 212         __vmcs_writel(field, value);
 213 }
 214
 215 static __always_inline void vmcs_write32(unsigned long field, u32 value)
 216 {
 217         vmcs_check32(field);
 218         if (static_branch_unlikely(&enable_evmcs))
 219                 return evmcs_write32(field, value);
 220
 221         __vmcs_writel(field, value);
 222 }
 223
 224 static __always_inline void vmcs_write64(unsigned long field, u64 value)
 225 {
 226         vmcs_check64(field);
 227         if (static_branch_unlikely(&enable_evmcs))
 228                 return evmcs_write64(field, value);
 229
 230         __vmcs_writel(field, value);
 231 #ifndef CONFIG_X86_64
 232         __vmcs_writel(field+1, value >> 32);
 233 #endif
 234 }
 235
 236 static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
 237 {
 238         vmcs_checkl(field);
 239         if (static_branch_unlikely(&enable_evmcs))
 240                 return evmcs_write64(field, value);
 241
 242         __vmcs_writel(field, value);
 243 }
 244
 245 static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
 246 {
 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);
 251
 252         __vmcs_writel(field, __vmcs_readl(field) & ~mask);
 253 }
 254
 255 static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
 256 {
 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);
 261
 262         __vmcs_writel(field, __vmcs_readl(field) | mask);
 263 }
 264
 265 static inline void vmcs_clear(struct vmcs *vmcs)
 266 {
 267         u64 phys_addr = __pa(vmcs);
 268
 269         vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr);
 270 }
 271
 272 static inline void vmcs_load(struct vmcs *vmcs)
 273 {
 274         u64 phys_addr = __pa(vmcs);
 275
 276         if (static_branch_unlikely(&enable_evmcs))
 277                 return evmcs_load(phys_addr);
 278
 279         vmx_asm1(vmptrld, "m"(phys_addr), vmcs, phys_addr);
 280 }
 281
 282 static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
 283 {
 284         struct {
 285                 u64 vpid : 16;
 286                 u64 rsvd : 48;
 287                 u64 gva;
 288         } operand = { vpid, 0, gva };
 289
 290         vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva);
 291 }
 292
 293 static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
 294 {
 295         struct {
 296                 u64 eptp, gpa;
 297         } operand = {eptp, gpa};
 298
 299         vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa);
 300 }
 301
 302 static inline void vpid_sync_vcpu_single(int vpid)
 303 {
 304         if (vpid == 0)
 305                 return;
 306
 307         __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
 308 }
 309
 310 static inline void vpid_sync_vcpu_global(void)
 311 {
 312         __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
 313 }
 314
 315 static inline void vpid_sync_context(int vpid)
 316 {
 317         if (cpu_has_vmx_invvpid_single())
 318                 vpid_sync_vcpu_single(vpid);
 319         else if (vpid != 0)
 320                 vpid_sync_vcpu_global();
 321 }
 322
 323 static inline void vpid_sync_vcpu_addr(int vpid, gva_t addr)
 324 {
 325         if (vpid == 0)
 326                 return;
 327
 328         if (cpu_has_vmx_invvpid_individual_addr())
 329                 __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
 330         else
 331                 vpid_sync_context(vpid);
 332 }
 333
 334 static inline void ept_sync_global(void)
 335 {
 336         __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
 337 }
 338
 339 static inline void ept_sync_context(u64 eptp)
 340 {
 341         if (cpu_has_vmx_invept_context())
 342                 __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
 343         else
 344                 ept_sync_global();
 345 }
 346
 347 #endif /* __KVM_X86_VMX_INSN_H */