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vhost-scsi: Add VMState descriptor 

As preparation of enabling migration of vhost-scsi device,
define it’s VMState. Note, we keep the convention of
verifying in the pre_save() method that the vhost backend
must be stopped before attempting to save the device
state. Similar to how it is done for vhost-vsock.

Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Nir Weiner <nir.weiner@oracle.com>
Message-Id: <20190416125912.44001-3-liran.alon@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Nir Weiner 2019-04-16 15:59:11 +03:00 committed by Michael S. Tsirkin
parent c6d369fd78
commit 4ea5742558
1 changed files with 23 additions and 0 deletions
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23
hw/scsi/vhost-scsi.c
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@ -139,6 +139,28 @@ static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
}
static int vhost_scsi_pre_save(void *opaque)
{
VHostSCSICommon *vsc = opaque;
/* At this point, backend must be stopped, otherwise
* it might keep writing to memory. */
assert(!vsc->dev.started);
return 0;
}
static const VMStateDescription vmstate_virtio_vhost_scsi = {
.name = "virtio-vhost_scsi",
.minimum_version_id = 1,
.version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_VIRTIO_DEVICE,
VMSTATE_END_OF_LIST()
},
.pre_save = vhost_scsi_pre_save,
};
static void vhost_scsi_realize(DeviceState *dev, Error **errp)
{
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
@ -256,6 +278,7 @@ static void vhost_scsi_class_init(ObjectClass *klass, void *data)
FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass);
dc->props = vhost_scsi_properties;
dc->vmsd = &vmstate_virtio_vhost_scsi;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
vdc->realize = vhost_scsi_realize;
vdc->unrealize = vhost_scsi_unrealize;