[PULL 13/13] hw/misc/vmlaunchupdate: do not clear control bits upon fw-cfg select op

[Gerd Hoffmann <kraxel@redhat.com>]

From: Ani Sinha <anisinha@redhat.com>

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>
---
 hw/misc/vmlaunchupdate.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/hw/misc/vmlaunchupdate.c b/hw/misc/vmlaunchupdate.c
index afa2d278aefc..847d2d963f10 100644
--- a/hw/misc/vmlaunchupdate.c
+++ b/hw/misc/vmlaunchupdate.c
@@ -41,7 +41,6 @@ static bool vmlaunchupdate_supported(void)
 static void init_vm_launch_update(VMLaunchUpdateState *s)
 {
     s->launch_update.capabilities = VM_LAUNCHUPDATE_FORMAT_IGVM;
-    s->launch_update.control = 0;
 
     if (s->disabled) {
         s->launch_update.control |= VM_LAUNCHUPDATE_CTL_DISABLE;
-- 
2.55.0