KVM: SEV: Return INVALID_EVENT for SNP-only #VMGEXIT from non-SNP guest

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Signal INVALID_EVENT, not MISSING_INPUT, if a non-SNP guest attempts to
invoke an SNP-only #VMGEXIT.  Opportunistically move the checks out of
sev_es_validate_vmgexit() to continue the march towards making said helper
a predicate whose sole purpose is to verify the guest has marked required
GHCB fields as valid.

Fixes: e366f92ea9 ("KVM: SEV: Support SEV-SNP AP Creation NAE event")
Fixes: 9b54e248d2 ("KVM: SEV: Add support to handle Page State Change VMGEXIT")
Fixes: 88caf544c9 ("KVM: SEV: Provide support for SNP_GUEST_REQUEST NAE event")
Fixes: 74458e4859 ("KVM: SEV: Provide support for SNP_EXTENDED_GUEST_REQUEST NAE event")
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260501202250.2115252-21-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20260529183549.1104619-21-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2026-05-29 20:35:45 +02:00 • committed by Paolo Bonzini

parent 9a6e8d23dd

commit 95d8c59cdf

1 changed files with 22 additions and 5 deletions

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arch/x86/kvm/svm/sev.c

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