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virtio-scsi: dataplane: stop trying on notifier error

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There's no use to constantly trying to enable dataplane if we failed
to set up guest or host notifiers, so fence it off in that case.
We'll try again if the device is reinitialized.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Cornelia Huck 2014-10-15 15:15:26 +02:00 • committed by Paolo Bonzini
parent 361dcc790d
commit 4adea8042f
2 changed files with 9 additions and 0 deletions
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8
hw/scsi/virtio-scsi-dataplane.c
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@ -53,6 +53,7 @@ static VirtIOSCSIVring *virtio_scsi_vring_init(VirtIOSCSI *s,
if (rc != 0) {
fprintf(stderr, "virtio-scsi: Failed to set host notifier (%d)\n",
rc);
s->dataplane_fenced = true;
return NULL;
}
r->host_notifier = *virtio_queue_get_host_notifier(vq);
@ -198,6 +199,7 @@ void virtio_scsi_dataplane_start(VirtIOSCSI *s)
if (s->dataplane_started ||
s->dataplane_starting ||
s->dataplane_fenced ||
s->ctx != iothread_get_aio_context(vs->conf.iothread)) {
return;
}
@ -211,6 +213,7 @@ void virtio_scsi_dataplane_start(VirtIOSCSI *s)
if (rc != 0) {
fprintf(stderr, "virtio-scsi: Failed to set guest notifiers (%d), "
"ensure -enable-kvm is set\n", rc);
s->dataplane_fenced = true;
goto fail_guest_notifiers;
}
@ -262,6 +265,11 @@ void virtio_scsi_dataplane_stop(VirtIOSCSI *s)
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
int i;
/* Better luck next time. */
if (s->dataplane_fenced) {
s->dataplane_fenced = false;
return;
}
if (!s->dataplane_started || s->dataplane_stopping) {
return;
}