From 583b819622f77c9e62bf3cd4f44b08de8aa46dcd Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Thu, 25 Jun 2015 16:34:25 +0200
Subject: Migration compat for pckbd

Patchwork-id: 66497
O-Subject: [RHEL-7.2 qemu-kvm-rhev PATCH 1/1] Migration compat for pckbd
Bugzilla: 1215092
RH-Acked-by: Juan Quintela <quintela@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

2.2 added a new subsection to the pc keyboard model to preserve
the value of 'outport' across migration; to maintain migration
backwards compatibility this patch disables it on older machine types.
This leaves us no-worse-off than in older versions.

Even with the new code, the value migrated in 'outport' isn't used
anywhere in the pckbd model; for example the value migrated doesn't
change the state of the A20 line or potentially do a reset.

The only effect, as far as I can tell is if the guest were to
explicitly read the outport value it might get a more sensible reply.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
(cherry picked from commit d2aba8a17b40c081f2ce29bc12b3945b7fb91d53)
---
 hw/input/pckbd.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index 62678f3..7d43237 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -26,6 +26,7 @@
 #include "hw/isa/isa.h"
 #include "hw/i386/pc.h"
 #include "hw/input/ps2.h"
+#include "migration/migration.h"
 #include "sysemu/sysemu.h"
 
 /* debug PC keyboard */
@@ -389,6 +390,11 @@ static int kbd_outport_post_load(void *opaque, int version_id)
 static bool kbd_outport_needed(void *opaque)
 {
     KBDState *s = opaque;
+
+    if (migrate_pre_2_2) {
+        return false;
+    }
+
     return s->outport != kbd_outport_default(s);
 }
 
-- 
1.8.3.1