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vdpa_sim: set last_used_idx as last_avail_idx in vdpasim_queue_ready

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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 0e84f918fa ("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: 2c53d0f64c ("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>
This commit is contained in:
Eugenio Pérez 2023-03-02 19:18:57 +01:00 committed by Michael S. Tsirkin
parent 5a52215009
commit b4cca6d48e
1 changed files with 11 additions and 0 deletions
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11
drivers/vdpa/vdpa_sim/vdpa_sim.c
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@ -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;
}