sev.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * AMD SEV header for early boot related functions.
 4 *
 5 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 6 */
 7
 8#ifndef BOOT_COMPRESSED_SEV_H
 9#define BOOT_COMPRESSED_SEV_H
10
11#ifdef CONFIG_AMD_MEM_ENCRYPT
12
13#include <asm/shared/msr.h>
14
15void snp_accept_memory(phys_addr_t start, phys_addr_t end);
16u64 sev_get_status(void);
17bool early_is_sevsnp_guest(void);
18
19static inline u64 sev_es_rd_ghcb_msr(void)
20{
21	struct msr m;
22
23	raw_rdmsr(MSR_AMD64_SEV_ES_GHCB, &m);
24
25	return m.q;
26}
27
28static inline void sev_es_wr_ghcb_msr(u64 val)
29{
30	struct msr m;
31
32	m.q = val;
33	raw_wrmsr(MSR_AMD64_SEV_ES_GHCB, &m);
34}
35
36#else
37
38static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
39static inline u64 sev_get_status(void) { return 0; }
40static inline bool early_is_sevsnp_guest(void) { return false; }
41
42#endif
43
44#endif