[Xen-devel] [PATCH] xen-pvdevice: Introduce a simplistic xen-pvdevice save state

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

This should help to avoid problems with accessing the device after
migration/resume without PV drivers. Older systems will acquire
the new record when migrated which should not change their state for
worse.

Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
---
 hw/i386/xen/xen_pvdevice.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/hw/i386/xen/xen_pvdevice.c b/hw/i386/xen/xen_pvdevice.c
index c093b34..ef22a03 100644
--- a/hw/i386/xen/xen_pvdevice.c
+++ b/hw/i386/xen/xen_pvdevice.c
@@ -71,6 +71,16 @@ static const MemoryRegionOps xen_pv_mmio_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
+static const VMStateDescription vmstate_xen_pvdevice = {
+    .name = "xen-pvdevice",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(parent_obj, XenPVDevice),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static void xen_pv_realize(PCIDevice *pci_dev, Error **errp)
 {
     XenPVDevice *d = XEN_PV_DEVICE(pci_dev);
@@ -120,6 +130,7 @@ static void xen_pv_class_init(ObjectClass *klass, void 
*data)
     k->class_id = PCI_CLASS_SYSTEM_OTHER;
     dc->desc = "Xen PV Device";
     dc->props = xen_pv_props;
+    dc->vmsd = &vmstate_xen_pvdevice;
 }
 
 static const TypeInfo xen_pv_type_info = {
-- 
2.7.4


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