1 /* SPDX-License-Identifier: GPL-2.0 */
3 * AMD Encrypted Register State Support
5 * Author: Joerg Roedel <jroedel@suse.de>
8 #ifndef __ASM_ENCRYPTED_STATE_H
9 #define __ASM_ENCRYPTED_STATE_H
11 #include <linux/types.h>
12 #include <linux/sev-guest.h>
15 #include <asm/sev-common.h>
18 #define GHCB_PROTOCOL_MIN 1ULL
19 #define GHCB_PROTOCOL_MAX 2ULL
20 #define GHCB_DEFAULT_USAGE 0ULL
22 #define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); }
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 */
35 struct es_fault_info {
37 unsigned long error_code;
43 /* ES instruction emulation context */
47 struct es_fault_info fi;
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
55 #define CC_BLOB_SEV_HDR_MAGIC 0x45444d41
56 struct cc_blob_sev_info {
68 void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);
70 static inline u64 lower_bits(u64 val, unsigned int bits)
72 u64 mask = (1ULL << bits) - 1;
77 struct real_mode_header;
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);
85 /* PVALIDATE return codes */
86 #define PVALIDATE_FAIL_SIZEMISMATCH 6
88 /* Software defined (when rFlags.CF = 1) */
89 #define PVALIDATE_FAIL_NOUPDATE 255
91 /* RMUPDATE detected 4K page and 2MB page overlap. */
92 #define RMPUPDATE_FAIL_OVERLAP 4
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)
109 #define RMPADJUST_VMSA_PAGE_BIT BIT(16)
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;
119 struct sev_guest_platform_data {
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.
128 * See the GHCB spec section Secret page layout for the format for this area.
130 struct secrets_os_area {
135 u64 ap_jump_table_pa;
140 #define VMPCK_KEY_LEN 32
142 /* See the SNP spec version 0.9 for secrets page format */
143 struct snp_secrets_page_layout {
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;
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)
163 if (cc_vendor == CC_VENDOR_AMD &&
164 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
165 __sev_es_ist_enter(regs);
167 static __always_inline void sev_es_ist_exit(void)
169 if (cc_vendor == CC_VENDOR_AMD &&
170 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
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)
177 if (cc_vendor == CC_VENDOR_AMD &&
178 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
179 __sev_es_nmi_complete();
181 extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
182 extern void sev_enable(struct boot_params *bp);
184 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
188 /* "rmpadjust" mnemonic support in binutils 2.36 and newer */
189 asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t"
191 : "a"(vaddr), "c"(rmp_psize), "d"(attrs)
196 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate)
201 /* "pvalidate" mnemonic support in binutils 2.36 and newer */
202 asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t"
204 : CC_OUT(c) (no_rmpupdate), "=a"(rc)
205 : "a"(vaddr), "c"(rmp_psize), "d"(validate)
209 return PVALIDATE_FAIL_NOUPDATE;
214 struct snp_guest_request_ioctl;
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 __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op);
222 void snp_set_memory_shared(unsigned long vaddr, unsigned long npages);
223 void snp_set_memory_private(unsigned long vaddr, unsigned long npages);
224 void snp_set_wakeup_secondary_cpu(void);
225 bool snp_init(struct boot_params *bp);
226 void __noreturn snp_abort(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 kdump_sev_callback(void);
232 void sev_show_status(void);
234 static inline void sev_es_ist_enter(struct pt_regs *regs) { }
235 static inline void sev_es_ist_exit(void) { }
236 static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
237 static inline void sev_es_nmi_complete(void) { }
238 static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
239 static inline void sev_enable(struct boot_params *bp) { }
240 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; }
241 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; }
242 static inline void setup_ghcb(void) { }
243 static inline void __init
244 early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
245 static inline void __init
246 early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
247 static inline void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op) { }
248 static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { }
249 static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { }
250 static inline void snp_set_wakeup_secondary_cpu(void) { }
251 static inline bool snp_init(struct boot_params *bp) { return false; }
252 static inline void snp_abort(void) { }
253 static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio)
258 static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
259 static inline u64 snp_get_unsupported_features(u64 status) { return 0; }
260 static inline u64 sev_get_status(void) { return 0; }
261 static inline void kdump_sev_callback(void) { }
262 static inline void sev_show_status(void) { }
265 #ifdef CONFIG_KVM_AMD_SEV
266 bool snp_probe_rmptable_info(void);
267 int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level);
268 void snp_dump_hva_rmpentry(unsigned long address);
270 int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, bool immutable);
271 int rmp_make_shared(u64 pfn, enum pg_level level);
272 void snp_leak_pages(u64 pfn, unsigned int npages);
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,
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) {}