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[4000];
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
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