[Qemu-devel] [RFC 2/5] vfio: Add struct vfio_vmstate_info to introduce vfio device put/get funtion

[Yulei Zhang <yulei.zhang@intel.com>]

Introduce vfio_device_put/vfio_device_get funtion for vfio device state
save/restore usage. And vfio device unmigratable flag will be set to false
during initialization if device flag VFIO_DEVICE_FLAGS_MIGRATABLE is set.

Signed-off-by: Yulei Zhang <yulei.zhang@intel.com>
---
 hw/vfio/pci.c | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index bf2e0ff..7de4eb4 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -37,6 +37,7 @@
 
 static void vfio_disable_interrupts(VFIOPCIDevice *vdev);
 static void vfio_mmap_set_enabled(VFIOPCIDevice *vdev, bool enabled);
+static VMStateDescription vfio_pci_vmstate;
 
 /*
  * Disabling BAR mmaping can be slow, but toggling it around INTx can
@@ -2375,6 +2376,7 @@ static void vfio_populate_device(VFIOPCIDevice *vdev, Error **errp)
         }
 
         QLIST_INIT(&vdev->device_state.quirks);
+        vfio_pci_vmstate.unmigratable = 0;
     }
 
     ret = vfio_get_region_info(vbasedev,
@@ -2946,6 +2948,17 @@ post_reset:
     vfio_pci_post_reset(vdev);
 }
 
+static int vfio_device_put(QEMUFile *f, void *pv, size_t size, VMStateField *field,
+                            QJSON *vmdesc)
+{
+    return 0;
+}
+
+static int vfio_device_get(QEMUFile *f, void *pv, size_t size, VMStateField *field)
+{
+    return 0;
+}
+
 static void vfio_instance_init(Object *obj)
 {
     PCIDevice *pci_dev = PCI_DEVICE(obj);
@@ -2990,9 +3003,29 @@ static Property vfio_pci_dev_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
-static const VMStateDescription vfio_pci_vmstate = {
+static VMStateInfo vfio_vmstate_info = {
+    .name = "vfio-state",
+    .get = vfio_device_get,
+    .put = vfio_device_put,
+};
+
+static VMStateDescription vfio_pci_vmstate = {
     .name = "vfio-pci",
     .unmigratable = 1,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        {
+            .name         = "vfio dev",
+            .version_id   = 0,
+            .field_exists = NULL,
+            .size         = 0,
+            .info         = &vfio_vmstate_info,
+            .flags        = VMS_SINGLE,
+            .offset       = 0,
+         },
+        VMSTATE_END_OF_LIST()
+    },
 };
 
 static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
-- 
2.7.4