x86/sev: Include XSS value in GHCB CPUID request

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When a guest issues a CPUID instruction for Fn0000000D_x01, the hypervisor may
be intercepting the CPUID instruction and need to access the guest XSS value.
For SEV-ES, the XSS value is encrypted and needs to be included in the GHCB to
be visible to the hypervisor.

Signed-off-by: John Allen <john.allen@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://patch.msgid.link/all/20250924200852.4452-3-john.allen@amd.com/

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John Allen 2025-09-24 20:08:52 +00:00 • committed by Borislav Petkov (AMD)

parent 9249bcdea0

commit 92ad6505a4

2 changed files with 12 additions and 0 deletions

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11

arch/x86/coco/sev/vc-shared.c

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1

arch/x86/include/asm/svm.h

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