On Thu, Jun 01, 2023 at 03:20:44PM +0800, Tao Liu wrote:
> arch/x86/kernel/machine_kexec_64.c | 35 ++++++++++++++++++++++++++----
> 1 file changed, 31 insertions(+), 4 deletions(-)
Ok, pls try this totally untested thing.
Thx.
---
diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c
index 09dc8c187b3c..fefe27b2af85 100644
--- a/arch/x86/boot/compressed/sev.c
+++ b/arch/x86/boot/compressed/sev.c
@@ -404,13 +404,20 @@ void sev_enable(struct boot_params *bp)
if (bp)
bp->cc_blob_address = 0;
+ /* Check for the SME/SEV support leaf */
+ eax = 0x80000000;
+ ecx = 0;
+ native_cpuid(&eax, &ebx, &ecx, &edx);
+ if (eax < 0x8000001f)
+ return;
+
/*
* Setup/preliminary detection of SNP. This will be sanity-checked
* against CPUID/MSR values later.
*/
snp = snp_init(bp);
- /* Check for the SME/SEV support leaf */
+ /* Recheck the SME/SEV support leaf */
eax = 0x80000000;
ecx = 0;
native_cpuid(&eax, &ebx, &ecx, &edx);
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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