Sync full virtqueue on device reset

We initialize the whole virtqueue and must make sure that the device
sees this even for the areas that are normally only written by the
device. Otherwise there may be an assertion fail during ifconfig up, as
found by bluhm@ with hshoexer@'s bounce buffer diff.

OK bluhm@

diff --git a/sys/dev/pv/virtio.c b/sys/dev/pv/virtio.c
index 4c834b6..5172502 100644 (file)
--- a/sys/dev/pv/virtio.c
+++ b/sys/dev/pv/virtio.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: virtio.c,v 1.29 2024/08/01 11:13:19 sf Exp $  */
+/*     $OpenBSD: virtio.c,v 1.30 2024/08/13 08:47:28 sf Exp $  */
 /*     $NetBSD: virtio.c,v 1.3 2011/11/02 23:05:52 njoly Exp $ */
 
 /*
@@ -311,10 +311,11 @@ virtio_init_vq(struct virtio_softc *sc, struct virtqueue *vq)
                vq->vq_entries[i].qe_index = i;
        }
 
+       bus_dmamap_sync(sc->sc_dmat, vq->vq_dmamap, 0, vq->vq_bytesize,
+           BUS_DMASYNC_PREWRITE);
        /* enqueue/dequeue status */
        vq->vq_avail_idx = 0;
        vq->vq_used_idx = 0;
-       vq_sync_aring(sc, vq, BUS_DMASYNC_PREWRITE);
        vq_sync_uring(sc, vq, BUS_DMASYNC_PREREAD);
        vq->vq_queued = 1;
 }