linux-kernel - [PATCH v4 5/5] KVM: SVM: Increase supported GHCB protocol version

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Message-Id: <20210929155330.5597-6-joro@8bytes.org>
Date:   Wed, 29 Sep 2021 17:53:30 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, x86@...nel.org,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH v4 5/5] KVM: SVM: Increase supported GHCB protocol version

From: Brijesh Singh <brijesh.singh@....com>

Now that KVM has basic support for version 2 of the GHCB specification,
bump the maximum supported protocol version. The SNP specific functions
are still missing, but those are only required when the Hypervisor
supports running SNP guests.

Signed-off-by: Brijesh Singh <brijesh.singh@....com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 arch/x86/kvm/svm/sev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 22523ec08a7b..d2e03dc72558 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2394,7 +2394,7 @@ static u64 ghcb_msr_cpuid_resp(u64 reg, u64 value)
 }
 
 /* The min/max GHCB version supported by KVM. */
-#define GHCB_VERSION_MAX	1ULL
+#define GHCB_VERSION_MAX	2ULL
 #define GHCB_VERSION_MIN	1ULL
 
 static u64 ghcb_msr_version_info(void)
-- 
2.33.0