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 24struct boot_params; 25 26enum 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 35struct es_fault_info { 36 unsigned long vector; 37 unsigned long error_code; 38 unsigned long cr2; 39}; 40 41struct pt_regs; 42 43/* ES instruction emulation context */ 44struct 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 56struct 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 68void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code); 69 70static inline u64 lower_bits(u64 val, unsigned int bits) 71{ 72 u64 mask = (1ULL << bits) - 1; 73 74 return (val & mask); 75} 76 77struct real_mode_header; 78enum stack_type; 79 80/* Early IDT entry points for #VC handler */ 81extern void vc_no_ghcb(void); 82extern void vc_boot_ghcb(void); 83extern 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 100struct 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 */ 112struct 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 119struct 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 */ 130struct 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 */ 143struct snp_secrets_page_layout { 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 159extern void __sev_es_ist_enter(struct pt_regs *regs); 160extern void __sev_es_ist_exit(void); 161static __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} 167static __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} 173extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh); 174extern void __sev_es_nmi_complete(void); 175static __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} 181extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); 182extern void sev_enable(struct boot_params *bp); 183 184static 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} 196static 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 214struct snp_guest_request_ioctl; 215 216void setup_ghcb(void); 217void early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, 218 unsigned long npages); 219void early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, 220 unsigned long npages); 221void snp_set_memory_shared(unsigned long vaddr, unsigned long npages); 222void snp_set_memory_private(unsigned long vaddr, unsigned long npages); 223void snp_set_wakeup_secondary_cpu(void); 224bool snp_init(struct boot_params *bp); 225void __noreturn snp_abort(void); 226void snp_dmi_setup(void); 227int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio); 228void snp_accept_memory(phys_addr_t start, phys_addr_t end); 229u64 snp_get_unsupported_features(u64 status); 230u64 sev_get_status(void); 231void sev_show_status(void); 232#else 233static inline void sev_es_ist_enter(struct pt_regs *regs) { } 234static inline void sev_es_ist_exit(void) { } 235static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; } 236static inline void sev_es_nmi_complete(void) { } 237static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; } 238static inline void sev_enable(struct boot_params *bp) { } 239static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; } 240static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; } 241static inline void setup_ghcb(void) { } 242static inline void __init 243early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { } 244static inline void __init 245early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { } 246static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { } 247static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { } 248static inline void snp_set_wakeup_secondary_cpu(void) { } 249static inline bool snp_init(struct boot_params *bp) { return false; } 250static inline void snp_abort(void) { } 251static inline void snp_dmi_setup(void) { } 252static 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 257static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { } 258static inline u64 snp_get_unsupported_features(u64 status) { return 0; } 259static inline u64 sev_get_status(void) { return 0; } 260static inline void sev_show_status(void) { } 261#endif 262 263#ifdef CONFIG_KVM_AMD_SEV 264bool snp_probe_rmptable_info(void); 265int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level); 266void snp_dump_hva_rmpentry(unsigned long address); 267int psmash(u64 pfn); 268int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, bool immutable); 269int rmp_make_shared(u64 pfn, enum pg_level level); 270void snp_leak_pages(u64 pfn, unsigned int npages); 271void kdump_sev_callback(void); 272#else 273static inline bool snp_probe_rmptable_info(void) { return false; } 274static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENODEV; } 275static inline void snp_dump_hva_rmpentry(unsigned long address) {} 276static inline int psmash(u64 pfn) { return -ENODEV; } 277static inline int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, 278 bool immutable) 279{ 280 return -ENODEV; 281} 282static inline int rmp_make_shared(u64 pfn, enum pg_level level) { return -ENODEV; } 283static inline void snp_leak_pages(u64 pfn, unsigned int npages) {} 284static inline void kdump_sev_callback(void) { } 285#endif 286 287#endif 288