| 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 "../msr.h" |
| 14 | |
| 15 | void snp_accept_memory(phys_addr_t start, phys_addr_t end); |
| 16 | u64 sev_get_status(void); |
| 17 | bool early_is_sevsnp_guest(void); |
| 18 | |
| 19 | static inline u64 sev_es_rd_ghcb_msr(void) |
| 20 | { |
| 21 | struct msr m; |
| 22 | |
| 23 | boot_rdmsr(MSR_AMD64_SEV_ES_GHCB, m: &m); |
| 24 | |
| 25 | return m.q; |
| 26 | } |
| 27 | |
| 28 | static inline void sev_es_wr_ghcb_msr(u64 val) |
| 29 | { |
| 30 | struct msr m; |
| 31 | |
| 32 | m.q = val; |
| 33 | boot_wrmsr(MSR_AMD64_SEV_ES_GHCB, m: &m); |
| 34 | } |
| 35 | |
| 36 | #else |
| 37 | |
| 38 | static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { } |
| 39 | static inline u64 sev_get_status(void) { return 0; } |
| 40 | static inline bool early_is_sevsnp_guest(void) { return false; } |
| 41 | |
| 42 | #endif |
| 43 | |
| 44 | #endif |
| 45 | |