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dataplane: print why starting failed 

Setting up guest or host notifiers may fail, but the user will have
no idea why: Let's print the error returned by the callback.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Cornelia Huck 2014-07-25 14:10:46 +02:00 committed by Stefan Hajnoczi
parent 16b38080e3
commit 267e1a204c
1 changed files with 8 additions and 5 deletions
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13
hw/block/dataplane/virtio-blk.c
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@ -218,6 +218,7 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
VirtIOBlock *vblk = VIRTIO_BLK(s->vdev); VirtIOBlock *vblk = VIRTIO_BLK(s->vdev);
VirtQueue *vq; VirtQueue *vq;
int r;
if (s->started) { if (s->started) {
return; return;
@ -236,16 +237,18 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
} }
/* Set up guest notifier (irq) */ /* Set up guest notifier (irq) */
if (k->set_guest_notifiers(qbus->parent, 1, true) != 0) { r = k->set_guest_notifiers(qbus->parent, 1, true);
fprintf(stderr, "virtio-blk failed to set guest notifier, " if (r != 0) {
"ensure -enable-kvm is set\n"); fprintf(stderr, "virtio-blk failed to set guest notifier (%d), "
"ensure -enable-kvm is set\n", r);
exit(1); exit(1);
} }
s->guest_notifier = virtio_queue_get_guest_notifier(vq); s->guest_notifier = virtio_queue_get_guest_notifier(vq);
/* Set up virtqueue notify */ /* Set up virtqueue notify */
if (k->set_host_notifier(qbus->parent, 0, true) != 0) { r = k->set_host_notifier(qbus->parent, 0, true);
fprintf(stderr, "virtio-blk failed to set host notifier\n"); if (r != 0) {
fprintf(stderr, "virtio-blk failed to set host notifier (%d)\n", r);
exit(1); exit(1);
} }
s->host_notifier = *virtio_queue_get_host_notifier(vq); s->host_notifier = *virtio_queue_get_host_notifier(vq);