From: Joerg Roedel jroedel@suse.de
[ Upstream commit 3ad84246a4097010f3ae3d6944120c0be00e9e7a ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/boot/compressed/mem_encrypt.S | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/x86/boot/compressed/mem_encrypt.S b/arch/x86/boot/compressed/mem_encrypt.S index dd07e7b41b115..3092ae173f94e 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