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x86/boot/compressed/64: Introduce sev_status

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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
This commit is contained in:
Joerg Roedel 2020-10-28 17:46:55 +01:00 committed by Borislav Petkov
parent 3650b228f8
commit 3ad84246a4
1 changed files with 15 additions and 1 deletions
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16
arch/x86/boot/compressed/mem_encrypt.S
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@ -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