cachepc-qemu

commit 6079922050b5c5db19c7e19fae7a398ff3502523
parent 2b331b911f86f0d04eb9400a403105753ed5b69a
Author: Michael Roth <michael.roth@amd.com>
Date:   Thu, 23 Dec 2021 10:11:44 -0600

i386/sev: fix launch measurement crash for SEV-SNP

Launch measurement measurement is not supported for SEV-SNP guests
since it is reported later for checking during attestation workflow.
For SEV-SNP, QEMU's launch measurement is meant to be a no-op, but
currently results in a crash. Fix that.

Reported-by: Niteesh Dubey <niteesh@us.ibm.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>

Diffstat:
M
target/i386/sev.c
 | 
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/target/i386/sev.c b/target/i386/sev.c
@@ -1173,7 +1173,9 @@ free_measurement:
 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) {