vdpa_sim: set last_used_idx as last_avail_idx in vdpasim_queue_ready

Starting from an used_idx different than 0 is needed in use cases like
virtual machine migration.  Not doing so and letting the caller set an
avail idx different than 0 causes destination device to try to use old
buffers that source driver already recover and are not available
anymore.

Since vdpa_sim does not support receive inflight descriptors as a
destination of a migration, let's set both avail_idx and used_idx the
same at vq start.  This is how vhost-user works in a
VHOST_SET_VRING_BASE call.

Although the simple fix is to set last_used_idx at vdpasim_set_vq_state,
it would be reset at vdpasim_queue_ready.  The last_avail_idx case is
fixed with commit 0e84f918fac8 ("vdpa_sim: not reset state in
vdpasim_queue_ready").  Since the only option is to make it equal to
last_avail_idx, adding the only change needed here.

This was discovered and tested live migrating the vdpa_sim_net device.

Fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator")
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230302181857.925374-1-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 6a0a658146269a5d1c218d88747f4a6186060869..eea23c630f7c08d3abc33ef463529bde775e64b8 100644 (file)
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -68,6 +68,17 @@ static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
                          (uintptr_t)vq->device_addr);
 
        vq->vring.last_avail_idx = last_avail_idx;
+
+       /*
+        * Since vdpa_sim does not support receive inflight descriptors as a
+        * destination of a migration, let's set both avail_idx and used_idx
+        * the same at vq start.  This is how vhost-user works in a
+        * VHOST_SET_VRING_BASE call.
+        *
+        * Although the simple fix is to set last_used_idx at
+        * vdpasim_set_vq_state, it would be reset at vdpasim_queue_ready.
+        */
+       vq->vring.last_used_idx = last_avail_idx;
        vq->vring.notify = vdpasim_vq_notify;
 }