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[v3,09/15] KVM: SEV: disable DEBUG_SWAP by default

Message ID 20240226190344.787149-10-pbonzini@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM: SEV: allow customizing VMSA features | expand

Commit Message

Paolo Bonzini Feb. 26, 2024, 7:03 p.m. UTC 
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@redhat.com>
---
 arch/x86/kvm/svm/sev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index b46612db0594..2db0b2b36120 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -252,7 +252,7 @@  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;
 
 	ret = sev_asid_new(sev);
 	if (ret)