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hw/misc/vmlaunchupdate: do not clear control bits upon fw-cfg select op

The control bits define the behavior of the interface and clearing the bits upon reading or select operation will break that behavior. For example, after CTL_HOST_IGVM is set by the guest through a write and then subsequently, if the guest tried to read back the values from the fw-cfg interface, the read would clear CTL_HOST_IGVM. This would break restoring the host IGVM upon subsequent reset. Fixes: 30688c02a76e50e4 ("hw/misc/vmlaunchupdate: Introduce hypervisor fw-cfg interface support") Signed-off-by: Ani Sinha <anisinha@redhat.com> Message-ID: <20260825124139.6900-1-anisinha@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Ani Sinha committed Aug 25, 2026 at 18:11 UTC 5ce32f7fdb786014255d4cfff749de307cdfdbfa

1 file changed -1

hw/misc/vmlaunchupdate.c

-1

@@ -41,7 +41,6 @@ static bool vmlaunchupdate_supported(void)

41 static void init_vm_launch_update(VMLaunchUpdateState *s)

42 {

43 s->launch_update.capabilities = VM_LAUNCHUPDATE_FORMAT_IGVM;

44 - s->launch_update.control = 0;

45 if (s->disabled) {

46 s->launch_update.control |= VM_LAUNCHUPDATE_CTL_DISABLE;