From: Cornelia Huck <cornelia.huck@de.ibm.com>
Date: Wed, 15 Oct 2014 13:15:26 +0000 (+0200)
Subject: virtio-scsi: dataplane: stop trying on notifier error
X-Git-Tag: v2.2.0-rc0~22^2~24
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4adea8042f880dd9bd7cb5c191a781ec86fdc587;p=thirdparty%2Fqemu.git

virtio-scsi: dataplane: stop trying on notifier error

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>
---

diff --git a/hw/scsi/virtio-scsi-dataplane.c b/hw/scsi/virtio-scsi-dataplane.c
index 243a4765e9a..3097d544b42 100644
--- a/hw/scsi/virtio-scsi-dataplane.c
+++ b/hw/scsi/virtio-scsi-dataplane.c
@@ -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;
     }
diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h
index 1ce08581ea7..9e1a49c2c10 100644
--- a/include/hw/virtio/virtio-scsi.h
+++ b/include/hw/virtio/virtio-scsi.h
@@ -195,6 +195,7 @@ typedef struct VirtIOSCSI {
     bool dataplane_starting;
     bool dataplane_stopping;
     bool dataplane_disabled;
+    bool dataplane_fenced;
     Error *blocker;
     Notifier migration_state_notifier;
 } VirtIOSCSI;