sev.h

  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#include <asm/set_memory.h>
 18#include <asm/svm.h>
 19
 20#define GHCB_PROTOCOL_MIN	1ULL
 21#define GHCB_PROTOCOL_MAX	2ULL
 22#define GHCB_DEFAULT_USAGE	0ULL
 23
 24#define	VMGEXIT()			{ asm volatile("rep; vmmcall\n\r"); }
 25
 26struct boot_params;
 27
 28enum es_result {
 29	ES_OK,			/* All good */
 30	ES_UNSUPPORTED,		/* Requested operation not supported */
 31	ES_VMM_ERROR,		/* Unexpected state from the VMM */
 32	ES_DECODE_FAILED,	/* Instruction decoding failed */
 33	ES_EXCEPTION,		/* Instruction caused exception */
 34	ES_RETRY,		/* Retry instruction emulation */
 35};
 36
 37struct es_fault_info {
 38	unsigned long vector;
 39	unsigned long error_code;
 40	unsigned long cr2;
 41};
 42
 43struct pt_regs;
 44
 45/* ES instruction emulation context */
 46struct es_em_ctxt {
 47	struct pt_regs *regs;
 48	struct insn insn;
 49	struct es_fault_info fi;
 50};
 51
 52/*
 53 * AMD SEV Confidential computing blob structure. The structure is
 54 * defined in OVMF UEFI firmware header:
 55 * https://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h
 56 */
 57#define CC_BLOB_SEV_HDR_MAGIC	0x45444d41
 58struct cc_blob_sev_info {
 59	u32 magic;
 60	u16 version;
 61	u16 reserved;
 62	u64 secrets_phys;
 63	u32 secrets_len;
 64	u32 rsvd1;
 65	u64 cpuid_phys;
 66	u32 cpuid_len;
 67	u32 rsvd2;
 68} __packed;
 69
 70void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);
 71
 72static inline u64 lower_bits(u64 val, unsigned int bits)
 73{
 74	u64 mask = (1ULL << bits) - 1;
 75
 76	return (val & mask);
 77}
 78
 79struct real_mode_header;
 80enum stack_type;
 81
 82/* Early IDT entry points for #VC handler */
 83extern void vc_no_ghcb(void);
 84extern void vc_boot_ghcb(void);
 85extern bool handle_vc_boot_ghcb(struct pt_regs *regs);
 86
 87/*
 88 * Individual entries of the SNP CPUID table, as defined by the SNP
 89 * Firmware ABI, Revision 0.9, Section 7.1, Table 14.
 90 */
 91struct snp_cpuid_fn {
 92	u32 eax_in;
 93	u32 ecx_in;
 94	u64 xcr0_in;
 95	u64 xss_in;
 96	u32 eax;
 97	u32 ebx;
 98	u32 ecx;
 99	u32 edx;
100	u64 __reserved;
101} __packed;
102
103/*
104 * SNP CPUID table, as defined by the SNP Firmware ABI, Revision 0.9,
105 * Section 8.14.2.6. Also noted there is the SNP firmware-enforced limit
106 * of 64 entries per CPUID table.
107 */
108#define SNP_CPUID_COUNT_MAX 64
109
110struct snp_cpuid_table {
111	u32 count;
112	u32 __reserved1;
113	u64 __reserved2;
114	struct snp_cpuid_fn fn[SNP_CPUID_COUNT_MAX];
115} __packed;
116
117/* PVALIDATE return codes */
118#define PVALIDATE_FAIL_SIZEMISMATCH	6
119
120/* Software defined (when rFlags.CF = 1) */
121#define PVALIDATE_FAIL_NOUPDATE		255
122
123/* RMUPDATE detected 4K page and 2MB page overlap. */
124#define RMPUPDATE_FAIL_OVERLAP		4
125
126/* PSMASH failed due to concurrent access by another CPU */
127#define PSMASH_FAIL_INUSE		3
128
129/* RMP page size */
130#define RMP_PG_SIZE_4K			0
131#define RMP_PG_SIZE_2M			1
132#define RMP_TO_PG_LEVEL(level)		(((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M)
133#define PG_LEVEL_TO_RMP(level)		(((level) == PG_LEVEL_4K) ? RMP_PG_SIZE_4K : RMP_PG_SIZE_2M)
134
135struct rmp_state {
136	u64 gpa;
137	u8 assigned;
138	u8 pagesize;
139	u8 immutable;
140	u8 rsvd;
141	u32 asid;
142} __packed;
143
144#define RMPADJUST_VMSA_PAGE_BIT		BIT(16)
145
146/* SNP Guest message request */
147struct snp_req_data {
148	unsigned long req_gpa;
149	unsigned long resp_gpa;
150	unsigned long data_gpa;
151	unsigned int data_npages;
152};
153
154#define MAX_AUTHTAG_LEN		32
155#define AUTHTAG_LEN		16
156#define AAD_LEN			48
157#define MSG_HDR_VER		1
158
159#define SNP_REQ_MAX_RETRY_DURATION      (60*HZ)
160#define SNP_REQ_RETRY_DELAY             (2*HZ)
161
162/* See SNP spec SNP_GUEST_REQUEST section for the structure */
163enum msg_type {
164	SNP_MSG_TYPE_INVALID = 0,
165	SNP_MSG_CPUID_REQ,
166	SNP_MSG_CPUID_RSP,
167	SNP_MSG_KEY_REQ,
168	SNP_MSG_KEY_RSP,
169	SNP_MSG_REPORT_REQ,
170	SNP_MSG_REPORT_RSP,
171	SNP_MSG_EXPORT_REQ,
172	SNP_MSG_EXPORT_RSP,
173	SNP_MSG_IMPORT_REQ,
174	SNP_MSG_IMPORT_RSP,
175	SNP_MSG_ABSORB_REQ,
176	SNP_MSG_ABSORB_RSP,
177	SNP_MSG_VMRK_REQ,
178	SNP_MSG_VMRK_RSP,
179
180	SNP_MSG_TSC_INFO_REQ = 17,
181	SNP_MSG_TSC_INFO_RSP,
182
183	SNP_MSG_TYPE_MAX
184};
185
186enum aead_algo {
187	SNP_AEAD_INVALID,
188	SNP_AEAD_AES_256_GCM,
189};
190
191struct snp_guest_msg_hdr {
192	u8 authtag[MAX_AUTHTAG_LEN];
193	u64 msg_seqno;
194	u8 rsvd1[8];
195	u8 algo;
196	u8 hdr_version;
197	u16 hdr_sz;
198	u8 msg_type;
199	u8 msg_version;
200	u16 msg_sz;
201	u32 rsvd2;
202	u8 msg_vmpck;
203	u8 rsvd3[35];
204} __packed;
205
206struct snp_guest_msg {
207	struct snp_guest_msg_hdr hdr;
208	u8 payload[PAGE_SIZE - sizeof(struct snp_guest_msg_hdr)];
209} __packed;
210
211#define SNP_TSC_INFO_REQ_SZ	128
212
213struct snp_tsc_info_req {
214	u8 rsvd[SNP_TSC_INFO_REQ_SZ];
215} __packed;
216
217struct snp_tsc_info_resp {
218	u32 status;
219	u32 rsvd1;
220	u64 tsc_scale;
221	u64 tsc_offset;
222	u32 tsc_factor;
223	u8 rsvd2[100];
224} __packed;
225
226/*
227 * Obtain the mean TSC frequency by decreasing the nominal TSC frequency with
228 * TSC_FACTOR as documented in the SNP Firmware ABI specification:
229 *
230 * GUEST_TSC_FREQ * (1 - (TSC_FACTOR * 0.00001))
231 *
232 * which is equivalent to:
233 *
234 * GUEST_TSC_FREQ -= (GUEST_TSC_FREQ * TSC_FACTOR) / 100000;
235 */
236#define SNP_SCALE_TSC_FREQ(freq, factor) ((freq) - (freq) * (factor) / 100000)
237
238struct snp_guest_req {
239	void *req_buf;
240	size_t req_sz;
241
242	void *resp_buf;
243	size_t resp_sz;
244
245	u64 exit_code;
246	u64 exitinfo2;
247	unsigned int vmpck_id;
248	u8 msg_version;
249	u8 msg_type;
250
251	struct snp_req_data input;
252	void *certs_data;
253};
254
255/*
256 * The secrets page contains 96-bytes of reserved field that can be used by
257 * the guest OS. The guest OS uses the area to save the message sequence
258 * number for each VMPCK.
259 *
260 * See the GHCB spec section Secret page layout for the format for this area.
261 */
262struct secrets_os_area {
263	u32 msg_seqno_0;
264	u32 msg_seqno_1;
265	u32 msg_seqno_2;
266	u32 msg_seqno_3;
267	u64 ap_jump_table_pa;
268	u8 rsvd[40];
269	u8 guest_usage[32];
270} __packed;
271
272#define VMPCK_KEY_LEN		32
273
274/* See the SNP spec version 0.9 for secrets page format */
275struct snp_secrets_page {
276	u32 version;
277	u32 imien	: 1,
278	    rsvd1	: 31;
279	u32 fms;
280	u32 rsvd2;
281	u8 gosvw[16];
282	u8 vmpck0[VMPCK_KEY_LEN];
283	u8 vmpck1[VMPCK_KEY_LEN];
284	u8 vmpck2[VMPCK_KEY_LEN];
285	u8 vmpck3[VMPCK_KEY_LEN];
286	struct secrets_os_area os_area;
287
288	u8 vmsa_tweak_bitmap[64];
289
290	/* SVSM fields */
291	u64 svsm_base;
292	u64 svsm_size;
293	u64 svsm_caa;
294	u32 svsm_max_version;
295	u8 svsm_guest_vmpl;
296	u8 rsvd3[3];
297
298	/* The percentage decrease from nominal to mean TSC frequency. */
299	u32 tsc_factor;
300
301	/* Remainder of page */
302	u8 rsvd4[3740];
303} __packed;
304
305struct snp_msg_desc {
306	/* request and response are in unencrypted memory */
307	struct snp_guest_msg *request, *response;
308
309	/*
310	 * Avoid information leakage by double-buffering shared messages
311	 * in fields that are in regular encrypted memory.
312	 */
313	struct snp_guest_msg secret_request, secret_response;
314
315	struct snp_secrets_page *secrets;
316
317	struct aesgcm_ctx *ctx;
318
319	u32 *os_area_msg_seqno;
320	u8 *vmpck;
321	int vmpck_id;
322};
323
324/*
325 * The SVSM Calling Area (CA) related structures.
326 */
327struct svsm_ca {
328	u8 call_pending;
329	u8 mem_available;
330	u8 rsvd1[6];
331
332	u8 svsm_buffer[PAGE_SIZE - 8];
333};
334
335#define SVSM_SUCCESS				0
336#define SVSM_ERR_INCOMPLETE			0x80000000
337#define SVSM_ERR_UNSUPPORTED_PROTOCOL		0x80000001
338#define SVSM_ERR_UNSUPPORTED_CALL		0x80000002
339#define SVSM_ERR_INVALID_ADDRESS		0x80000003
340#define SVSM_ERR_INVALID_FORMAT			0x80000004
341#define SVSM_ERR_INVALID_PARAMETER		0x80000005
342#define SVSM_ERR_INVALID_REQUEST		0x80000006
343#define SVSM_ERR_BUSY				0x80000007
344#define SVSM_PVALIDATE_FAIL_SIZEMISMATCH	0x80001006
345
346/*
347 * The SVSM PVALIDATE related structures
348 */
349struct svsm_pvalidate_entry {
350	u64 page_size		: 2,
351	    action		: 1,
352	    ignore_cf		: 1,
353	    rsvd		: 8,
354	    pfn			: 52;
355};
356
357struct svsm_pvalidate_call {
358	u16 num_entries;
359	u16 cur_index;
360
361	u8 rsvd1[4];
362
363	struct svsm_pvalidate_entry entry[];
364};
365
366#define SVSM_PVALIDATE_MAX_COUNT	((sizeof_field(struct svsm_ca, svsm_buffer) -		\
367					  offsetof(struct svsm_pvalidate_call, entry)) /	\
368					 sizeof(struct svsm_pvalidate_entry))
369
370/*
371 * The SVSM Attestation related structures
372 */
373struct svsm_loc_entry {
374	u64 pa;
375	u32 len;
376	u8 rsvd[4];
377};
378
379struct svsm_attest_call {
380	struct svsm_loc_entry report_buf;
381	struct svsm_loc_entry nonce;
382	struct svsm_loc_entry manifest_buf;
383	struct svsm_loc_entry certificates_buf;
384
385	/* For attesting a single service */
386	u8 service_guid[16];
387	u32 service_manifest_ver;
388	u8 rsvd[4];
389};
390
391/* PTE descriptor used for the prepare_pte_enc() operations. */
392struct pte_enc_desc {
393	pte_t *kpte;
394	int pte_level;
395	bool encrypt;
396	/* pfn of the kpte above */
397	unsigned long pfn;
398	/* physical address of @pfn */
399	unsigned long pa;
400	/* virtual address of @pfn */
401	void *va;
402	/* memory covered by the pte */
403	unsigned long size;
404	pgprot_t new_pgprot;
405};
406
407/*
408 * SVSM protocol structure
409 */
410struct svsm_call {
411	struct svsm_ca *caa;
412	u64 rax;
413	u64 rcx;
414	u64 rdx;
415	u64 r8;
416	u64 r9;
417	u64 rax_out;
418	u64 rcx_out;
419	u64 rdx_out;
420	u64 r8_out;
421	u64 r9_out;
422};
423
424#define SVSM_CORE_CALL(x)		((0ULL << 32) | (x))
425#define SVSM_CORE_REMAP_CA		0
426#define SVSM_CORE_PVALIDATE		1
427#define SVSM_CORE_CREATE_VCPU		2
428#define SVSM_CORE_DELETE_VCPU		3
429
430#define SVSM_ATTEST_CALL(x)		((1ULL << 32) | (x))
431#define SVSM_ATTEST_SERVICES		0
432#define SVSM_ATTEST_SINGLE_SERVICE	1
433
434#define SVSM_VTPM_CALL(x)		((2ULL << 32) | (x))
435#define SVSM_VTPM_QUERY			0
436#define SVSM_VTPM_CMD			1
437
438#ifdef CONFIG_AMD_MEM_ENCRYPT
439
440extern u8 snp_vmpl;
441
442extern void __sev_es_ist_enter(struct pt_regs *regs);
443extern void __sev_es_ist_exit(void);
444static __always_inline void sev_es_ist_enter(struct pt_regs *regs)
445{
446	if (cc_vendor == CC_VENDOR_AMD &&
447	    cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
448		__sev_es_ist_enter(regs);
449}
450static __always_inline void sev_es_ist_exit(void)
451{
452	if (cc_vendor == CC_VENDOR_AMD &&
453	    cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
454		__sev_es_ist_exit();
455}
456extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh);
457extern void __sev_es_nmi_complete(void);
458static __always_inline void sev_es_nmi_complete(void)
459{
460	if (cc_vendor == CC_VENDOR_AMD &&
461	    cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
462		__sev_es_nmi_complete();
463}
464extern int __init sev_es_efi_map_ghcbs_cas(pgd_t *pgd);
465extern void sev_enable(struct boot_params *bp);
466
467/*
468 * RMPADJUST modifies the RMP permissions of a page of a lesser-
469 * privileged (numerically higher) VMPL.
470 *
471 * If the guest is running at a higher-privilege than the privilege
472 * level the instruction is targeting, the instruction will succeed,
473 * otherwise, it will fail.
474 */
475static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
476{
477	int rc;
478
479	/* "rmpadjust" mnemonic support in binutils 2.36 and newer */
480	asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t"
481		     : "=a"(rc)
482		     : "a"(vaddr), "c"(rmp_psize), "d"(attrs)
483		     : "memory", "cc");
484
485	return rc;
486}
487static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate)
488{
489	bool no_rmpupdate;
490	int rc;
491
492	/* "pvalidate" mnemonic support in binutils 2.36 and newer */
493	asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t"
494		     : "=@ccc"(no_rmpupdate), "=a"(rc)
495		     : "a"(vaddr), "c"(rmp_psize), "d"(validate)
496		     : "memory", "cc");
497
498	if (no_rmpupdate)
499		return PVALIDATE_FAIL_NOUPDATE;
500
501	return rc;
502}
503
504void setup_ghcb(void);
505void snp_register_ghcb_early(unsigned long paddr);
506void early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
507				  unsigned long npages);
508void early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
509				 unsigned long npages);
510void snp_set_memory_shared(unsigned long vaddr, unsigned long npages);
511void snp_set_memory_private(unsigned long vaddr, unsigned long npages);
512void snp_set_wakeup_secondary_cpu(void);
513bool snp_init(struct boot_params *bp);
514void snp_dmi_setup(void);
515int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input);
516void snp_accept_memory(phys_addr_t start, phys_addr_t end);
517u64 snp_get_unsupported_features(u64 status);
518u64 sev_get_status(void);
519void sev_show_status(void);
520int prepare_pte_enc(struct pte_enc_desc *d);
521void set_pte_enc_mask(pte_t *kpte, unsigned long pfn, pgprot_t new_prot);
522void snp_kexec_finish(void);
523void snp_kexec_begin(void);
524
525int snp_msg_init(struct snp_msg_desc *mdesc, int vmpck_id);
526struct snp_msg_desc *snp_msg_alloc(void);
527void snp_msg_free(struct snp_msg_desc *mdesc);
528int snp_send_guest_request(struct snp_msg_desc *mdesc, struct snp_guest_req *req);
529
530int snp_svsm_vtpm_send_command(u8 *buffer);
531
532void __init snp_secure_tsc_prepare(void);
533void __init snp_secure_tsc_init(void);
534enum es_result savic_register_gpa(u64 gpa);
535enum es_result savic_unregister_gpa(u64 *gpa);
536u64 savic_ghcb_msr_read(u32 reg);
537void savic_ghcb_msr_write(u32 reg, u64 value);
538
539static __always_inline void vc_ghcb_invalidate(struct ghcb *ghcb)
540{
541	ghcb->save.sw_exit_code = 0;
542	__builtin_memset(ghcb->save.valid_bitmap, 0, sizeof(ghcb->save.valid_bitmap));
543}
544
545/* I/O parameters for CPUID-related helpers */
546struct cpuid_leaf {
547	u32 fn;
548	u32 subfn;
549	u32 eax;
550	u32 ebx;
551	u32 ecx;
552	u32 edx;
553};
554
555int svsm_perform_msr_protocol(struct svsm_call *call);
556int __pi_svsm_perform_msr_protocol(struct svsm_call *call);
557int snp_cpuid(void (*cpuid_fn)(void *ctx, struct cpuid_leaf *leaf),
558	      void *ctx, struct cpuid_leaf *leaf);
559
560void svsm_issue_call(struct svsm_call *call, u8 *pending);
561int svsm_process_result_codes(struct svsm_call *call);
562
563void __noreturn sev_es_terminate(unsigned int set, unsigned int reason);
564enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
565				   struct es_em_ctxt *ctxt,
566				   u64 exit_code, u64 exit_info_1,
567				   u64 exit_info_2);
568
569bool sev_es_negotiate_protocol(void);
570bool sev_es_check_cpu_features(void);
571
572extern u16 ghcb_version;
573extern struct ghcb *boot_ghcb;
574extern bool sev_snp_needs_sfw;
575
576struct psc_desc {
577	enum psc_op op;
578	struct svsm_ca *ca;
579	u64 caa_pa;
580};
581
582static inline void sev_evict_cache(void *va, int npages)
583{
584	volatile u8 val __always_unused;
585	u8 *bytes = va;
586	int page_idx;
587
588	/*
589	 * For SEV guests, a read from the first/last cache-lines of a 4K page
590	 * using the guest key is sufficient to cause a flush of all cache-lines
591	 * associated with that 4K page without incurring all the overhead of a
592	 * full CLFLUSH sequence.
593	 */
594	for (page_idx = 0; page_idx < npages; page_idx++) {
595		val = bytes[page_idx * PAGE_SIZE];
596		val = bytes[page_idx * PAGE_SIZE + PAGE_SIZE - 1];
597	}
598}
599
600#else	/* !CONFIG_AMD_MEM_ENCRYPT */
601
602#define snp_vmpl 0
603static inline void sev_es_ist_enter(struct pt_regs *regs) { }
604static inline void sev_es_ist_exit(void) { }
605static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
606static inline void sev_es_nmi_complete(void) { }
607static inline int sev_es_efi_map_ghcbs_cas(pgd_t *pgd) { return 0; }
608static inline void sev_enable(struct boot_params *bp) { }
609static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; }
610static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; }
611static inline void setup_ghcb(void) { }
612static inline void __init
613early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
614static inline void __init
615early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
616static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { }
617static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { }
618static inline void snp_set_wakeup_secondary_cpu(void) { }
619static inline bool snp_init(struct boot_params *bp) { return false; }
620static inline void snp_dmi_setup(void) { }
621static inline int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input)
622{
623	return -ENOTTY;
624}
625static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
626static inline u64 snp_get_unsupported_features(u64 status) { return 0; }
627static inline u64 sev_get_status(void) { return 0; }
628static inline void sev_show_status(void) { }
629static inline int prepare_pte_enc(struct pte_enc_desc *d) { return 0; }
630static inline void set_pte_enc_mask(pte_t *kpte, unsigned long pfn, pgprot_t new_prot) { }
631static inline void snp_kexec_finish(void) { }
632static inline void snp_kexec_begin(void) { }
633static inline int snp_msg_init(struct snp_msg_desc *mdesc, int vmpck_id) { return -1; }
634static inline struct snp_msg_desc *snp_msg_alloc(void) { return NULL; }
635static inline void snp_msg_free(struct snp_msg_desc *mdesc) { }
636static inline int snp_send_guest_request(struct snp_msg_desc *mdesc,
637					 struct snp_guest_req *req) { return -ENODEV; }
638static inline int snp_svsm_vtpm_send_command(u8 *buffer) { return -ENODEV; }
639static inline void __init snp_secure_tsc_prepare(void) { }
640static inline void __init snp_secure_tsc_init(void) { }
641static inline void sev_evict_cache(void *va, int npages) {}
642static inline enum es_result savic_register_gpa(u64 gpa) { return ES_UNSUPPORTED; }
643static inline enum es_result savic_unregister_gpa(u64 *gpa) { return ES_UNSUPPORTED; }
644static inline void savic_ghcb_msr_write(u32 reg, u64 value) { }
645static inline u64 savic_ghcb_msr_read(u32 reg) { return 0; }
646
647#endif	/* CONFIG_AMD_MEM_ENCRYPT */
648
649#ifdef CONFIG_KVM_AMD_SEV
650bool snp_probe_rmptable_info(void);
651int snp_rmptable_init(void);
652int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level);
653void snp_dump_hva_rmpentry(unsigned long address);
654int psmash(u64 pfn);
655int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, bool immutable);
656int rmp_make_shared(u64 pfn, enum pg_level level);
657void __snp_leak_pages(u64 pfn, unsigned int npages, bool dump_rmp);
658void kdump_sev_callback(void);
659void snp_fixup_e820_tables(void);
660static inline void snp_leak_pages(u64 pfn, unsigned int pages)
661{
662	__snp_leak_pages(pfn, pages, true);
663}
664#else
665static inline bool snp_probe_rmptable_info(void) { return false; }
666static inline int snp_rmptable_init(void) { return -ENOSYS; }
667static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENODEV; }
668static inline void snp_dump_hva_rmpentry(unsigned long address) {}
669static inline int psmash(u64 pfn) { return -ENODEV; }
670static inline int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid,
671				   bool immutable)
672{
673	return -ENODEV;
674}
675static inline int rmp_make_shared(u64 pfn, enum pg_level level) { return -ENODEV; }
676static inline void __snp_leak_pages(u64 pfn, unsigned int npages, bool dump_rmp) {}
677static inline void snp_leak_pages(u64 pfn, unsigned int npages) {}
678static inline void kdump_sev_callback(void) { }
679static inline void snp_fixup_e820_tables(void) {}
680#endif
681
682#endif