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virtio-blk: fix disabled mode 

We must not call virtio_blk_data_plane_notify if dataplane is
disabled: we would hit a segmentation fault in notify_guest_bh as
s->guest_notifier has not been setup and is NULL.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-04-06 12:16:23 +02:00 committed by Michael S. Tsirkin
parent 2b2cbcadc1
commit eb41cf78fc
3 changed files with 5 additions and 5 deletions
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7
hw/block/dataplane/virtio-blk.c
View File

@ -29,7 +29,6 @@
struct VirtIOBlockDataPlane {
bool starting;
bool stopping;
bool disabled;
VirtIOBlkConf *conf;
@ -234,7 +233,7 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
fail_host_notifier:
k->set_guest_notifiers(qbus->parent, 1, false);
fail_guest_notifiers:
s->disabled = true;
vblk->dataplane_disabled = true;
s->starting = false;
vblk->dataplane_started = true;
}
@ -251,8 +250,8 @@ void virtio_blk_data_plane_stop(VirtIOBlockDataPlane *s)
}
/* Better luck next time. */
if (s->disabled) {
s->disabled = false;
if (vblk->dataplane_disabled) {
vblk->dataplane_disabled = false;
vblk->dataplane_started = false;
return;
}

2
hw/block/virtio-blk.c
View File

@ -54,7 +54,7 @@ static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status)
stb_p(&req->in->status, status);
virtqueue_push(s->vq, &req->elem, req->in_len);
if (s->dataplane) {
if (s->dataplane_started && !s->dataplane_disabled) {
virtio_blk_data_plane_notify(s->dataplane);
} else {
virtio_notify(vdev, s->vq);

1
include/hw/virtio/virtio-blk.h
View File

@ -53,6 +53,7 @@ typedef struct VirtIOBlock {
unsigned short sector_mask;
bool original_wce;
VMChangeStateEntry *change;
bool dataplane_disabled;
bool dataplane_started;
struct VirtIOBlockDataPlane *dataplane;
} VirtIOBlock;