[Qemu-devel] [PATCH] rtl8139: IO memory is not part of vmstate

[Alex Williamson <alex.williamson@redhat.com>]

The cpu_register_io_memory() value is unique to the VM instance and
should not be restored after migration/save.  Doing so means we
could be pointing at arbitrary device's io regions after migration/restore.

In this case, if we start a VM with a single rtl8139, hot add a 2nd,
migrate the VM, then hot remove the added NIC, the 1st NIC stops
working and the VM segfaults on reboot.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

 hw/rtl8139.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index d92981d..9c5fc84 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -3186,7 +3186,7 @@ static void rtl8139_pre_save(void *opaque)
 
 static const VMStateDescription vmstate_rtl8139 = {
     .name = "rtl8139",
-    .version_id = 4,
+    .version_id = 5,
     .minimum_version_id = 3,
     .minimum_version_id_old = 3,
     .post_load = rtl8139_post_load,
@@ -3234,7 +3234,7 @@ static const VMStateDescription vmstate_rtl8139 = {
 
         VMSTATE_UNUSED(4),
         VMSTATE_MACADDR(conf.macaddr, RTL8139State),
-        VMSTATE_INT32(rtl8139_mmio_io_addr, RTL8139State),
+        VMSTATE_UNUSED(4),
 
         VMSTATE_UINT32(currTxDesc, RTL8139State),
         VMSTATE_UINT32(currCPlusRxDesc, RTL8139State),