From 801baa693c1f6d7327475c39100c456db340cd3e Mon Sep 17 00:00:00 2001
From: Michael Roth <michael.roth@amd.com>
Date: Thu, 24 Feb 2022 10:56:11 -0600
Subject: x86/sev: Move MSR-based VMGEXITs for CPUID to helper

This code will also be used later for SEV-SNP-validated CPUID code in
some cases, so move it to a common helper.

While here, also add a check to terminate in cases where the CPUID
function/subfunction is indexed and the subfunction is non-zero, since
the GHCB MSR protocol does not support non-zero subfunctions.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220307213356.2797205-32-brijesh.singh@amd.com
---
 arch/x86/boot/compressed/sev.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'arch/x86/boot')

diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c
index f31b434e2ce4..7a9cfbc43f4b 100644
--- a/arch/x86/boot/compressed/sev.c
+++ b/arch/x86/boot/compressed/sev.c
@@ -20,6 +20,7 @@
 #include <asm/fpu/xcr.h>
 #include <asm/ptrace.h>
 #include <asm/svm.h>
+#include <asm/cpuid.h>
 
 #include "error.h"
 #include "../msr.h"
-- 
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