linux-kernel - [PATCH v2 06/11] KVM: SEV: disable DEBUG

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Message-Id: <20240223104009.632194-7-pbonzini@redhat.com>
Date: Fri, 23 Feb 2024 05:40:04 -0500
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Cc: seanjc@...gle.com,
	michael.roth@....com,
	aik@....com
Subject: [PATCH v2 06/11] KVM: SEV: disable DEBUG_SWAP by default

Disable all VMSA features in KVM_SEV_INIT and KVM_SEV_ES_INIT.  They are
not actually supported by SEV (a SEV guest does not have a VMSA to which
you can apply features) and they cause unexpected changes in measurement
for SEV-ES.

Going on, the way to enable them will be to use a new initialization ioctl
that takes the VMSA features as a parameter.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 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 b0e97f9617e3..06e03a6fe7e4 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -267,7 +267,7 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
 
 	sev->active = true;
 	sev->es_active = argp->id == KVM_SEV_ES_INIT;
-	sev->vmsa_features = sev_supported_vmsa_features;
+	sev->vmsa_features = 0;
 
 	asid = sev_asid_new(sev);
 	if (asid < 0)
-- 
2.39.1