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| author | Joerg Roedel <jroedel@suse.de> | 2020-10-28 19:46:55 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-10-29 12:54:36 +0300 |
| commit | 3ad84246a4097010f3ae3d6944120c0be00e9e7a (patch) | |
| tree | 3ab60b74d50fce11ca9a8eede258e32d83563a0a /arch/x86/boot/compressed/mem_encrypt.S | |
| parent | 3650b228f83adda7e5ee532e2b90429c03f7b9ec (diff) | |
| download | linux-3ad84246a4097010f3ae3d6944120c0be00e9e7a.tar.xz | |
x86/boot/compressed/64: Introduce sev_status
Introduce sev_status and initialize it together with sme_me_mask to have
an indicator which SEV features are enabled.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lkml.kernel.org/r/20201028164659.27002-2-joro@8bytes.org
Diffstat (limited to 'arch/x86/boot/compressed/mem_encrypt.S')
| -rw-r--r-- | arch/x86/boot/compressed/mem_encrypt.S | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/x86/boot/compressed/mem_encrypt.S b/arch/x86/boot/compressed/mem_encrypt.S index dd07e7b41b11..3092ae173f94 100644 --- a/arch/x86/boot/compressed/mem_encrypt.S +++ b/arch/x86/boot/compressed/mem_encrypt.S @@ -81,6 +81,19 @@ SYM_FUNC_START(set_sev_encryption_mask) bts %rax, sme_me_mask(%rip) /* Create the encryption mask */ + /* + * Read MSR_AMD64_SEV again and store it to sev_status. Can't do this in + * get_sev_encryption_bit() because this function is 32-bit code and + * shared between 64-bit and 32-bit boot path. + */ + movl $MSR_AMD64_SEV, %ecx /* Read the SEV MSR */ + rdmsr + + /* Store MSR value in sev_status */ + shlq $32, %rdx + orq %rdx, %rax + movq %rax, sev_status(%rip) + .Lno_sev_mask: movq %rbp, %rsp /* Restore original stack pointer */ @@ -96,5 +109,6 @@ SYM_FUNC_END(set_sev_encryption_mask) #ifdef CONFIG_AMD_MEM_ENCRYPT .balign 8 -SYM_DATA(sme_me_mask, .quad 0) +SYM_DATA(sme_me_mask, .quad 0) +SYM_DATA(sev_status, .quad 0) #endif |