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 /* RMP page size */ 95 #define RMP_PG_SIZE_4K 0 96 #define RMP_PG_SIZE_2M 1 97 #define RMP_TO_PG_LEVEL(level) (((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M) 98 #define PG_LEVEL_TO_RMP(level) (((level) == PG_LEVEL_4K) ? RMP_PG_SIZE_4K : RMP_PG_SIZE_2M) 99 100 struct rmp_state { 101 u64 gpa; 102 u8 assigned; 103 u8 pagesize; 104 u8 immutable; 105 u8 rsvd; 106 u32 asid; 107 } __packed; 108 109 #define RMPADJUST_VMSA_PAGE_BIT BIT(16) 110 111 /* SNP Guest message request */ 112 struct snp_req_data { 113 unsigned long req_gpa; 114 unsigned long resp_gpa; 115 unsigned long data_gpa; 116 unsigned int data_npages; 117 }; 118 119 struct sev_guest_platform_data { 120 u64 secrets_gpa; 121 }; 122 123 /* 124 * The secrets page contains 96-bytes of reserved field that can be used by 125 * the guest OS. The guest OS uses the area to save the message sequence 126 * number for each VMPCK. 127 * 128 * See the GHCB spec section Secret page layout for the format for this area. 129 */ 130 struct secrets_os_area { 131 u32 msg_seqno_0; 132 u32 msg_seqno_1; 133 u32 msg_seqno_2; 134 u32 msg_seqno_3; 135 u64 ap_jump_table_pa; 136 u8 rsvd[40]; 137 u8 guest_usage[32]; 138 } __packed; 139 140 #define VMPCK_KEY_LEN 32 141 142 /* See the SNP spec version 0.9 for secrets page format */ 143 struct snp_secrets_page { 144 u32 version; 145 u32 imien : 1, 146 rsvd1 : 31; 147 u32 fms; 148 u32 rsvd2; 149 u8 gosvw[16]; 150 u8 vmpck0[VMPCK_KEY_LEN]; 151 u8 vmpck1[VMPCK_KEY_LEN]; 152 u8 vmpck2[VMPCK_KEY_LEN]; 153 u8 vmpck3[VMPCK_KEY_LEN]; 154 struct secrets_os_area os_area; 155 u8 rsvd3[3840]; 156 } __packed; 157 158 #ifdef CONFIG_AMD_MEM_ENCRYPT 159 extern void __sev_es_ist_enter(struct pt_regs *regs); 160 extern void __sev_es_ist_exit(void); 161 static __always_inline void sev_es_ist_enter(struct pt_regs *regs) 162 { 163 if (cc_vendor == CC_VENDOR_AMD && 164 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) 165 __sev_es_ist_enter(regs); 166 } 167 static __always_inline void sev_es_ist_exit(void) 168 { 169 if (cc_vendor == CC_VENDOR_AMD && 170 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) 171 __sev_es_ist_exit(); 172 } 173 extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh); 174 extern void __sev_es_nmi_complete(void); 175 static __always_inline void sev_es_nmi_complete(void) 176 { 177 if (cc_vendor == CC_VENDOR_AMD && 178 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) 179 __sev_es_nmi_complete(); 180 } 181 extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); 182 extern void sev_enable(struct boot_params *bp); 183 184 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) 185 { 186 int rc; 187 188 /* "rmpadjust" mnemonic support in binutils 2.36 and newer */ 189 asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t" 190 : "=a"(rc) 191 : "a"(vaddr), "c"(rmp_psize), "d"(attrs) 192 : "memory", "cc"); 193 194 return rc; 195 } 196 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) 197 { 198 bool no_rmpupdate; 199 int rc; 200 201 /* "pvalidate" mnemonic support in binutils 2.36 and newer */ 202 asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t" 203 CC_SET(c) 204 : CC_OUT(c) (no_rmpupdate), "=a"(rc) 205 : "a"(vaddr), "c"(rmp_psize), "d"(validate) 206 : "memory", "cc"); 207 208 if (no_rmpupdate) 209 return PVALIDATE_FAIL_NOUPDATE; 210 211 return rc; 212 } 213 214 struct snp_guest_request_ioctl; 215 216 void setup_ghcb(void); 217 void early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, 218 unsigned long npages); 219 void early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, 220 unsigned long npages); 221 void snp_set_memory_shared(unsigned long vaddr, unsigned long npages); 222 void snp_set_memory_private(unsigned long vaddr, unsigned long npages); 223 void snp_set_wakeup_secondary_cpu(void); 224 bool snp_init(struct boot_params *bp); 225 void __noreturn snp_abort(void); 226 void snp_dmi_setup(void); 227 int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio); 228 void snp_accept_memory(phys_addr_t start, phys_addr_t end); 229 u64 snp_get_unsupported_features(u64 status); 230 u64 sev_get_status(void); 231 void sev_show_status(void); 232 #else 233 static inline void sev_es_ist_enter(struct pt_regs *regs) { } 234 static inline void sev_es_ist_exit(void) { } 235 static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; } 236 static inline void sev_es_nmi_complete(void) { } 237 static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; } 238 static inline void sev_enable(struct boot_params *bp) { } 239 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; } 240 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; } 241 static inline void setup_ghcb(void) { } 242 static inline void __init 243 early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { } 244 static inline void __init 245 early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { } 246 static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { } 247 static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { } 248 static inline void snp_set_wakeup_secondary_cpu(void) { } 249 static inline bool snp_init(struct boot_params *bp) { return false; } 250 static inline void snp_abort(void) { } 251 static inline void snp_dmi_setup(void) { } 252 static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio) 253 { 254 return -ENOTTY; 255 } 256 257 static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { } 258 static inline u64 snp_get_unsupported_features(u64 status) { return 0; } 259 static inline u64 sev_get_status(void) { return 0; } 260 static inline void sev_show_status(void) { } 261 #endif 262 263 #ifdef CONFIG_KVM_AMD_SEV 264 bool snp_probe_rmptable_info(void); 265 int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level); 266 void snp_dump_hva_rmpentry(unsigned long address); 267 int psmash(u64 pfn); 268 int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, bool immutable); 269 int rmp_make_shared(u64 pfn, enum pg_level level); 270 void snp_leak_pages(u64 pfn, unsigned int npages); 271 void kdump_sev_callback(void); 272 void snp_fixup_e820_tables(void); 273 #else 274 static inline bool snp_probe_rmptable_info(void) { return false; } 275 static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENODEV; } 276 static inline void snp_dump_hva_rmpentry(unsigned long address) {} 277 static inline int psmash(u64 pfn) { return -ENODEV; } 278 static inline int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, 279 bool immutable) 280 { 281 return -ENODEV; 282 } 283 static inline int rmp_make_shared(u64 pfn, enum pg_level level) { return -ENODEV; } 284 static inline void snp_leak_pages(u64 pfn, unsigned int npages) {} 285 static inline void kdump_sev_callback(void) { } 286 static inline void snp_fixup_e820_tables(void) {} 287 #endif 288 289 #endif 290