1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * AMD Encrypted Register State Support 4 * 5 * Author: Joerg Roedel <jroedel@suse.de> 6 */ 7 8 #ifndef __ASM_ENCRYPTED_STATE_H 9 #define __ASM_ENCRYPTED_STATE_H 10 11 #include <linux/types.h> 12 #include <linux/sev-guest.h> 13 14 #include <asm/insn.h> 15 #include <asm/sev-common.h> 16 #include <asm/coco.h> 17 18 #define GHCB_PROTOCOL_MIN 1ULL 19 #define GHCB_PROTOCOL_MAX 2ULL 20 #define GHCB_DEFAULT_USAGE 0ULL 21 22 #define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); } 23 24 struct boot_params; 25 26 enum es_result { 27 ES_OK, /* All good */ 28 ES_UNSUPPORTED, /* Requested operation not supported */ 29 ES_VMM_ERROR, /* Unexpected state from the VMM */ 30 ES_DECODE_FAILED, /* Instruction decoding failed */ 31 ES_EXCEPTION, /* Instruction caused exception */ 32 ES_RETRY, /* Retry instruction emulation */ 33 }; 34 35 struct es_fault_info { 36 unsigned long vector; 37 unsigned long error_code; 38 unsigned long cr2; 39 }; 40 41 struct pt_regs; 42 43 /* ES instruction emulation context */ 44 struct es_em_ctxt { 45 struct pt_regs *regs; 46 struct insn insn; 47 struct es_fault_info fi; 48 }; 49 50 /* 51 * AMD SEV Confidential computing blob structure. The structure is 52 * defined in OVMF UEFI firmware header: 53 * https://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h 54 */ 55 #define CC_BLOB_SEV_HDR_MAGIC 0x45444d41 56 struct cc_blob_sev_info { 57 u32 magic; 58 u16 version; 59 u16 reserved; 60 u64 secrets_phys; 61 u32 secrets_len; 62 u32 rsvd1; 63 u64 cpuid_phys; 64 u32 cpuid_len; 65 u32 rsvd2; 66 } __packed; 67 68 void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code); 69 70 static inline u64 lower_bits(u64 val, unsigned int bits) 71 { 72 u64 mask = (1ULL << bits) - 1; 73 74 return (val & mask); 75 } 76 77 struct real_mode_header; 78 enum stack_type; 79 80 /* Early IDT entry points for #VC handler */ 81 extern void vc_no_ghcb(void); 82 extern void vc_boot_ghcb(void); 83 extern bool handle_vc_boot_ghcb(struct pt_regs *regs); 84 85 /* PVALIDATE return codes */ 86 #define PVALIDATE_FAIL_SIZEMISMATCH 6 87 88 /* Software defined (when rFlags.CF = 1) */ 89 #define PVALIDATE_FAIL_NOUPDATE 255 90 91 /* RMUPDATE detected 4K page and 2MB page overlap. */ 92 #define RMPUPDATE_FAIL_OVERLAP 4 93 94 /* PSMASH failed due to concurrent access by another CPU */ 95 #define PSMASH_FAIL_INUSE 3 96 97 /* RMP page size */ 98 #define RMP_PG_SIZE_4K 0 99 #define RMP_PG_SIZE_2M 1 100 #define RMP_TO_PG_LEVEL(level) (((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M) 101 #define PG_LEVEL_TO_RMP(level) (((level) == PG_LEVEL_4K) ? RMP_PG_SIZE_4K : RMP_PG_SIZE_2M) 102 103 struct rmp_state { 104 u64 gpa; 105 u8 assigned; 106 u8 pagesize; 107 u8 immutable; 108 u8 rsvd; 109 u32 asid; 110 } __packed; 111 112 #define RMPADJUST_VMSA_PAGE_BIT BIT(16) 113 114 /* SNP Guest message request */ 115 struct snp_req_data { 116 unsigned long req_gpa; 117 unsigned long resp_gpa; 118 unsigned long data_gpa; 119 unsigned int data_npages; 120 }; 121 122 #define MAX_AUTHTAG_LEN 32 123 124 /* See SNP spec SNP_GUEST_REQUEST section for the structure */ 125 enum msg_type { 126 SNP_MSG_TYPE_INVALID = 0, 127 SNP_MSG_CPUID_REQ, 128 SNP_MSG_CPUID_RSP, 129 SNP_MSG_KEY_REQ, 130 SNP_MSG_KEY_RSP, 131 SNP_MSG_REPORT_REQ, 132 SNP_MSG_REPORT_RSP, 133 SNP_MSG_EXPORT_REQ, 134 SNP_MSG_EXPORT_RSP, 135 SNP_MSG_IMPORT_REQ, 136 SNP_MSG_IMPORT_RSP, 137 SNP_MSG_ABSORB_REQ, 138 SNP_MSG_ABSORB_RSP, 139 SNP_MSG_VMRK_REQ, 140 SNP_MSG_VMRK_RSP, 141 142 SNP_MSG_TYPE_MAX 143 }; 144 145 enum aead_algo { 146 SNP_AEAD_INVALID, 147 SNP_AEAD_AES_256_GCM, 148 }; 149 150 struct snp_guest_msg_hdr { 151 u8 authtag[MAX_AUTHTAG_LEN]; 152 u64 msg_seqno; 153 u8 rsvd1[8]; 154 u8 algo; 155 u8 hdr_version; 156 u16 hdr_sz; 157 u8 msg_type; 158 u8 msg_version; 159 u16 msg_sz; 160 u32 rsvd2; 161 u8 msg_vmpck; 162 u8 rsvd3[35]; 163 } __packed; 164 165 struct snp_guest_msg { 166 struct snp_guest_msg_hdr hdr; 167 u8 payload[PAGE_SIZE - sizeof(struct snp_guest_msg_hdr)]; 168 } __packed; 169 170 struct sev_guest_platform_data { 171 u64 secrets_gpa; 172 }; 173 174 /* 175 * The secrets page contains 96-bytes of reserved field that can be used by 176 * the guest OS. The guest OS uses the area to save the message sequence 177 * number for each VMPCK. 178 * 179 * See the GHCB spec section Secret page layout for the format for this area. 180 */ 181 struct secrets_os_area { 182 u32 msg_seqno_0; 183 u32 msg_seqno_1; 184 u32 msg_seqno_2; 185 u32 msg_seqno_3; 186 u64 ap_jump_table_pa; 187 u8 rsvd[40]; 188 u8 guest_usage[32]; 189 } __packed; 190 191 #define VMPCK_KEY_LEN 32 192 193 /* See the SNP spec version 0.9 for secrets page format */ 194 struct snp_secrets_page { 195 u32 version; 196 u32 imien : 1, 197 rsvd1 : 31; 198 u32 fms; 199 u32 rsvd2; 200 u8 gosvw[16]; 201 u8 vmpck0[VMPCK_KEY_LEN]; 202 u8 vmpck1[VMPCK_KEY_LEN]; 203 u8 vmpck2[VMPCK_KEY_LEN]; 204 u8 vmpck3[VMPCK_KEY_LEN]; 205 struct secrets_os_area os_area; 206 207 u8 vmsa_tweak_bitmap[64]; 208 209 /* SVSM fields */ 210 u64 svsm_base; 211 u64 svsm_size; 212 u64 svsm_caa; 213 u32 svsm_max_version; 214 u8 svsm_guest_vmpl; 215 u8 rsvd3[3]; 216 217 /* Remainder of page */ 218 u8 rsvd4[3744]; 219 } __packed; 220 221 /* 222 * The SVSM Calling Area (CA) related structures. 223 */ 224 struct svsm_ca { 225 u8 call_pending; 226 u8 mem_available; 227 u8 rsvd1[6]; 228 229 u8 svsm_buffer[PAGE_SIZE - 8]; 230 }; 231 232 #define SVSM_SUCCESS 0 233 #define SVSM_ERR_INCOMPLETE 0x80000000 234 #define SVSM_ERR_UNSUPPORTED_PROTOCOL 0x80000001 235 #define SVSM_ERR_UNSUPPORTED_CALL 0x80000002 236 #define SVSM_ERR_INVALID_ADDRESS 0x80000003 237 #define SVSM_ERR_INVALID_FORMAT 0x80000004 238 #define SVSM_ERR_INVALID_PARAMETER 0x80000005 239 #define SVSM_ERR_INVALID_REQUEST 0x80000006 240 #define SVSM_ERR_BUSY 0x80000007 241 #define SVSM_PVALIDATE_FAIL_SIZEMISMATCH 0x80001006 242 243 /* 244 * The SVSM PVALIDATE related structures 245 */ 246 struct svsm_pvalidate_entry { 247 u64 page_size : 2, 248 action : 1, 249 ignore_cf : 1, 250 rsvd : 8, 251 pfn : 52; 252 }; 253 254 struct svsm_pvalidate_call { 255 u16 num_entries; 256 u16 cur_index; 257 258 u8 rsvd1[4]; 259 260 struct svsm_pvalidate_entry entry[]; 261 }; 262 263 #define SVSM_PVALIDATE_MAX_COUNT ((sizeof_field(struct svsm_ca, svsm_buffer) - \ 264 offsetof(struct svsm_pvalidate_call, entry)) / \ 265 sizeof(struct svsm_pvalidate_entry)) 266 267 /* 268 * The SVSM Attestation related structures 269 */ 270 struct svsm_loc_entry { 271 u64 pa; 272 u32 len; 273 u8 rsvd[4]; 274 }; 275 276 struct svsm_attest_call { 277 struct svsm_loc_entry report_buf; 278 struct svsm_loc_entry nonce; 279 struct svsm_loc_entry manifest_buf; 280 struct svsm_loc_entry certificates_buf; 281 282 /* For attesting a single service */ 283 u8 service_guid[16]; 284 u32 service_manifest_ver; 285 u8 rsvd[4]; 286 }; 287 288 /* 289 * SVSM protocol structure 290 */ 291 struct svsm_call { 292 struct svsm_ca *caa; 293 u64 rax; 294 u64 rcx; 295 u64 rdx; 296 u64 r8; 297 u64 r9; 298 u64 rax_out; 299 u64 rcx_out; 300 u64 rdx_out; 301 u64 r8_out; 302 u64 r9_out; 303 }; 304 305 #define SVSM_CORE_CALL(x) ((0ULL << 32) | (x)) 306 #define SVSM_CORE_REMAP_CA 0 307 #define SVSM_CORE_PVALIDATE 1 308 #define SVSM_CORE_CREATE_VCPU 2 309 #define SVSM_CORE_DELETE_VCPU 3 310 311 #define SVSM_ATTEST_CALL(x) ((1ULL << 32) | (x)) 312 #define SVSM_ATTEST_SERVICES 0 313 #define SVSM_ATTEST_SINGLE_SERVICE 1 314 315 #ifdef CONFIG_AMD_MEM_ENCRYPT 316 317 extern u8 snp_vmpl; 318 319 extern void __sev_es_ist_enter(struct pt_regs *regs); 320 extern void __sev_es_ist_exit(void); 321 static __always_inline void sev_es_ist_enter(struct pt_regs *regs) 322 { 323 if (cc_vendor == CC_VENDOR_AMD && 324 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) 325 __sev_es_ist_enter(regs); 326 } 327 static __always_inline void sev_es_ist_exit(void) 328 { 329 if (cc_vendor == CC_VENDOR_AMD && 330 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) 331 __sev_es_ist_exit(); 332 } 333 extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh); 334 extern void __sev_es_nmi_complete(void); 335 static __always_inline void sev_es_nmi_complete(void) 336 { 337 if (cc_vendor == CC_VENDOR_AMD && 338 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) 339 __sev_es_nmi_complete(); 340 } 341 extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); 342 extern void sev_enable(struct boot_params *bp); 343 344 /* 345 * RMPADJUST modifies the RMP permissions of a page of a lesser- 346 * privileged (numerically higher) VMPL. 347 * 348 * If the guest is running at a higher-privilege than the privilege 349 * level the instruction is targeting, the instruction will succeed, 350 * otherwise, it will fail. 351 */ 352 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) 353 { 354 int rc; 355 356 /* "rmpadjust" mnemonic support in binutils 2.36 and newer */ 357 asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t" 358 : "=a"(rc) 359 : "a"(vaddr), "c"(rmp_psize), "d"(attrs) 360 : "memory", "cc"); 361 362 return rc; 363 } 364 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) 365 { 366 bool no_rmpupdate; 367 int rc; 368 369 /* "pvalidate" mnemonic support in binutils 2.36 and newer */ 370 asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t" 371 CC_SET(c) 372 : CC_OUT(c) (no_rmpupdate), "=a"(rc) 373 : "a"(vaddr), "c"(rmp_psize), "d"(validate) 374 : "memory", "cc"); 375 376 if (no_rmpupdate) 377 return PVALIDATE_FAIL_NOUPDATE; 378 379 return rc; 380 } 381 382 struct snp_guest_request_ioctl; 383 384 void setup_ghcb(void); 385 void early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, 386 unsigned long npages); 387 void early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, 388 unsigned long npages); 389 void snp_set_memory_shared(unsigned long vaddr, unsigned long npages); 390 void snp_set_memory_private(unsigned long vaddr, unsigned long npages); 391 void snp_set_wakeup_secondary_cpu(void); 392 bool snp_init(struct boot_params *bp); 393 void __noreturn snp_abort(void); 394 void snp_dmi_setup(void); 395 int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio); 396 int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input); 397 void snp_accept_memory(phys_addr_t start, phys_addr_t end); 398 u64 snp_get_unsupported_features(u64 status); 399 u64 sev_get_status(void); 400 void sev_show_status(void); 401 void snp_update_svsm_ca(void); 402 403 #else /* !CONFIG_AMD_MEM_ENCRYPT */ 404 405 #define snp_vmpl 0 406 static inline void sev_es_ist_enter(struct pt_regs *regs) { } 407 static inline void sev_es_ist_exit(void) { } 408 static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; } 409 static inline void sev_es_nmi_complete(void) { } 410 static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; } 411 static inline void sev_enable(struct boot_params *bp) { } 412 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; } 413 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; } 414 static inline void setup_ghcb(void) { } 415 static inline void __init 416 early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { } 417 static inline void __init 418 early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { } 419 static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { } 420 static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { } 421 static inline void snp_set_wakeup_secondary_cpu(void) { } 422 static inline bool snp_init(struct boot_params *bp) { return false; } 423 static inline void snp_abort(void) { } 424 static inline void snp_dmi_setup(void) { } 425 static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio) 426 { 427 return -ENOTTY; 428 } 429 static inline int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input) 430 { 431 return -ENOTTY; 432 } 433 static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { } 434 static inline u64 snp_get_unsupported_features(u64 status) { return 0; } 435 static inline u64 sev_get_status(void) { return 0; } 436 static inline void sev_show_status(void) { } 437 static inline void snp_update_svsm_ca(void) { } 438 439 #endif /* CONFIG_AMD_MEM_ENCRYPT */ 440 441 #ifdef CONFIG_KVM_AMD_SEV 442 bool snp_probe_rmptable_info(void); 443 int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level); 444 void snp_dump_hva_rmpentry(unsigned long address); 445 int psmash(u64 pfn); 446 int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, bool immutable); 447 int rmp_make_shared(u64 pfn, enum pg_level level); 448 void snp_leak_pages(u64 pfn, unsigned int npages); 449 void kdump_sev_callback(void); 450 void snp_fixup_e820_tables(void); 451 #else 452 static inline bool snp_probe_rmptable_info(void) { return false; } 453 static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENODEV; } 454 static inline void snp_dump_hva_rmpentry(unsigned long address) {} 455 static inline int psmash(u64 pfn) { return -ENODEV; } 456 static inline int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, 457 bool immutable) 458 { 459 return -ENODEV; 460 } 461 static inline int rmp_make_shared(u64 pfn, enum pg_level level) { return -ENODEV; } 462 static inline void snp_leak_pages(u64 pfn, unsigned int npages) {} 463 static inline void kdump_sev_callback(void) { } 464 static inline void snp_fixup_e820_tables(void) {} 465 #endif 466 467 #endif 468