i386/sev: Don't return launch measurements for SEV-SNP guests

For SEV-SNP guests, launch measurement is queried from within the guest
during attestation, so don't attempt to return it as part of
query-sev-launch-measure.

Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@amd.com>
Message-ID: <20240530111643.1091816-13-pankaj.gupta@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 6525b3c1a0ed3680cfb2f6a0ced5e151fc01d7a6..c3daaf1ad508cc7e6383d733d01e86a9a50646ab 100644 (file)
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -795,7 +795,9 @@ sev_launch_get_measure(Notifier *notifier, void *unused)
 
 static char *sev_get_launch_measurement(void)
 {
-    SevGuestState *sev_guest = SEV_GUEST(MACHINE(qdev_get_machine())->cgs);
+    ConfidentialGuestSupport *cgs = MACHINE(qdev_get_machine())->cgs;
+    SevGuestState *sev_guest =
+        (SevGuestState *)object_dynamic_cast(OBJECT(cgs), TYPE_SEV_GUEST);
 
     if (sev_guest &&
         SEV_COMMON(sev_guest)->state >= SEV_STATE_LAUNCH_SECRET) {