[RFC PATCH 21/23] virtio-blk: Modify save/load handler to handle inuse varialble.

[Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>]

Modify inuse type to uint16_t, let save/load to handle, and revert
last_avail_idx with inuse if there are outstanding emulation.

Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
---
 hw/virtio.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/hw/virtio.c b/hw/virtio.c
index 7c020a3..502929c 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -70,7 +70,7 @@ struct VirtQueue
     VRing vring;
     target_phys_addr_t pa;
     uint16_t last_avail_idx;
-    int inuse;
+    uint16_t inuse;
     uint16_t vector;
     void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
 };
@@ -641,6 +641,7 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
         qemu_put_be32(f, vdev->vq[i].vring.num);
         qemu_put_be64(f, vdev->vq[i].pa);
         qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
+        qemu_put_be16s(f, &vdev->vq[i].inuse);
         if (vdev->binding->save_queue)
             vdev->binding->save_queue(vdev->binding_opaque, i, f);
     }
@@ -678,6 +679,11 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
         vdev->vq[i].vring.num = qemu_get_be32(f);
         vdev->vq[i].pa = qemu_get_be64(f);
         qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
+        qemu_get_be16s(f, &vdev->vq[i].inuse);
+
+        /* revert last_avail_idx if there are outstanding emulation. */
+        vdev->vq[i].last_avail_idx -= vdev->vq[i].inuse;
+        vdev->vq[i].inuse = 0;
 
         if (vdev->vq[i].pa) {
             virtqueue_init(&vdev->vq[i]);
-- 
1.7.0.31.g1df487

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