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/bootparam.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 enum es_result { 25 ES_OK, /* All good */ 26 ES_UNSUPPORTED, /* Requested operation not supported */ 27 ES_VMM_ERROR, /* Unexpected state from the VMM */ 28 ES_DECODE_FAILED, /* Instruction decoding failed */ 29 ES_EXCEPTION, /* Instruction caused exception */ 30 ES_RETRY, /* Retry instruction emulation */ 31 }; 32 33 struct es_fault_info { 34 unsigned long vector; 35 unsigned long error_code; 36 unsigned long cr2; 37 }; 38 39 struct pt_regs; 40 41 /* ES instruction emulation context */ 42 struct es_em_ctxt { 43 struct pt_regs *regs; 44 struct insn insn; 45 struct es_fault_info fi; 46 }; 47 48 /* 49 * AMD SEV Confidential computing blob structure. The structure is 50 * defined in OVMF UEFI firmware header: 51 * https://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h 52 */ 53 #define CC_BLOB_SEV_HDR_MAGIC 0x45444d41 54 struct cc_blob_sev_info { 55 u32 magic; 56 u16 version; 57 u16 reserved; 58 u64 secrets_phys; 59 u32 secrets_len; 60 u32 rsvd1; 61 u64 cpuid_phys; 62 u32 cpuid_len; 63 u32 rsvd2; 64 } __packed; 65 66 void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code); 67 68 static inline u64 lower_bits(u64 val, unsigned int bits) 69 { 70 u64 mask = (1ULL << bits) - 1; 71 72 return (val & mask); 73 } 74 75 struct real_mode_header; 76 enum stack_type; 77 78 /* Early IDT entry points for #VC handler */ 79 extern void vc_no_ghcb(void); 80 extern void vc_boot_ghcb(void); 81 extern bool handle_vc_boot_ghcb(struct pt_regs *regs); 82 83 /* Software defined (when rFlags.CF = 1) */ 84 #define PVALIDATE_FAIL_NOUPDATE 255 85 86 /* RMP page size */ 87 #define RMP_PG_SIZE_4K 0 88 89 #define RMPADJUST_VMSA_PAGE_BIT BIT(16) 90 91 /* SNP Guest message request */ 92 struct snp_req_data { 93 unsigned long req_gpa; 94 unsigned long resp_gpa; 95 unsigned long data_gpa; 96 unsigned int data_npages; 97 }; 98 99 struct sev_guest_platform_data { 100 u64 secrets_gpa; 101 }; 102 103 /* 104 * The secrets page contains 96-bytes of reserved field that can be used by 105 * the guest OS. The guest OS uses the area to save the message sequence 106 * number for each VMPCK. 107 * 108 * See the GHCB spec section Secret page layout for the format for this area. 109 */ 110 struct secrets_os_area { 111 u32 msg_seqno_0; 112 u32 msg_seqno_1; 113 u32 msg_seqno_2; 114 u32 msg_seqno_3; 115 u64 ap_jump_table_pa; 116 u8 rsvd[40]; 117 u8 guest_usage[32]; 118 } __packed; 119 120 #define VMPCK_KEY_LEN 32 121 122 /* See the SNP spec version 0.9 for secrets page format */ 123 struct snp_secrets_page_layout { 124 u32 version; 125 u32 imien : 1, 126 rsvd1 : 31; 127 u32 fms; 128 u32 rsvd2; 129 u8 gosvw[16]; 130 u8 vmpck0[VMPCK_KEY_LEN]; 131 u8 vmpck1[VMPCK_KEY_LEN]; 132 u8 vmpck2[VMPCK_KEY_LEN]; 133 u8 vmpck3[VMPCK_KEY_LEN]; 134 struct secrets_os_area os_area; 135 u8 rsvd3[3840]; 136 } __packed; 137 138 #ifdef CONFIG_AMD_MEM_ENCRYPT 139 extern struct static_key_false sev_es_enable_key; 140 extern void __sev_es_ist_enter(struct pt_regs *regs); 141 extern void __sev_es_ist_exit(void); 142 static __always_inline void sev_es_ist_enter(struct pt_regs *regs) 143 { 144 if (static_branch_unlikely(&sev_es_enable_key)) 145 __sev_es_ist_enter(regs); 146 } 147 static __always_inline void sev_es_ist_exit(void) 148 { 149 if (static_branch_unlikely(&sev_es_enable_key)) 150 __sev_es_ist_exit(); 151 } 152 extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh); 153 extern void __sev_es_nmi_complete(void); 154 static __always_inline void sev_es_nmi_complete(void) 155 { 156 if (static_branch_unlikely(&sev_es_enable_key)) 157 __sev_es_nmi_complete(); 158 } 159 extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); 160 161 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) 162 { 163 int rc; 164 165 /* "rmpadjust" mnemonic support in binutils 2.36 and newer */ 166 asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t" 167 : "=a"(rc) 168 : "a"(vaddr), "c"(rmp_psize), "d"(attrs) 169 : "memory", "cc"); 170 171 return rc; 172 } 173 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) 174 { 175 bool no_rmpupdate; 176 int rc; 177 178 /* "pvalidate" mnemonic support in binutils 2.36 and newer */ 179 asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t" 180 CC_SET(c) 181 : CC_OUT(c) (no_rmpupdate), "=a"(rc) 182 : "a"(vaddr), "c"(rmp_psize), "d"(validate) 183 : "memory", "cc"); 184 185 if (no_rmpupdate) 186 return PVALIDATE_FAIL_NOUPDATE; 187 188 return rc; 189 } 190 191 struct snp_guest_request_ioctl; 192 193 void setup_ghcb(void); 194 void __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, 195 unsigned int npages); 196 void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, 197 unsigned int npages); 198 void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op); 199 void snp_set_memory_shared(unsigned long vaddr, unsigned int npages); 200 void snp_set_memory_private(unsigned long vaddr, unsigned int npages); 201 void snp_set_wakeup_secondary_cpu(void); 202 bool snp_init(struct boot_params *bp); 203 void __init __noreturn snp_abort(void); 204 int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio); 205 #else 206 static inline void sev_es_ist_enter(struct pt_regs *regs) { } 207 static inline void sev_es_ist_exit(void) { } 208 static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; } 209 static inline void sev_es_nmi_complete(void) { } 210 static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; } 211 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; } 212 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; } 213 static inline void setup_ghcb(void) { } 214 static inline void __init 215 early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned int npages) { } 216 static inline void __init 217 early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned int npages) { } 218 static inline void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op) { } 219 static inline void snp_set_memory_shared(unsigned long vaddr, unsigned int npages) { } 220 static inline void snp_set_memory_private(unsigned long vaddr, unsigned int npages) { } 221 static inline void snp_set_wakeup_secondary_cpu(void) { } 222 static inline bool snp_init(struct boot_params *bp) { return false; } 223 static inline void snp_abort(void) { } 224 static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio) 225 { 226 return -ENOTTY; 227 } 228 #endif 229 230 #endif 231