virtio-scsi: Fix acquire/release in dataplane handlers

After the AioContext lock push down, there is a race between
virtio_scsi_dataplane_start and those "assert(s->ctx &&
s->dataplane_started)", because the latter doesn't isn't wrapped in
aio_context_acquire.

Reproducer is simply booting a Fedora guest with an empty
virtio-scsi-dataplane controller:

    qemu-system-x86_64 \
      -drive if=none,id=root,format=raw,file=Fedora-Cloud-Base-25-1.3.x86_64.raw \
      -device virtio-scsi \
      -device scsi-disk,drive=root,bootindex=1 \
      -object iothread,id=io \
      -device virtio-scsi-pci,iothread=io \
      -net user,hostfwd=tcp::10022-:22 -net nic,model=virtio -m 2048 \
      --enable-kvm

Fix this by moving acquire/release pairs from virtio_scsi_handle_*_vq to
their callers - and wrap the broken assertions in.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <20170317061447.16243-3-famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/hw/scsi/virtio-scsi-dataplane.c b/hw/scsi/virtio-scsi-dataplane.c
index 74c95e0e60..944ea4eb53 100644
--- a/hw/scsi/virtio-scsi-dataplane.c
+++ b/hw/scsi/virtio-scsi-dataplane.c
@@ -52,28 +52,40 @@ void virtio_scsi_dataplane_setup(VirtIOSCSI *s, Error **errp)
 static bool virtio_scsi_data_plane_handle_cmd(VirtIODevice *vdev,
                                               VirtQueue *vq)
 {
-    VirtIOSCSI *s = (VirtIOSCSI *)vdev;
+    bool progress;
+    VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 
+    virtio_scsi_acquire(s);
     assert(s->ctx && s->dataplane_started);
-    return virtio_scsi_handle_cmd_vq(s, vq);
+    progress = virtio_scsi_handle_cmd_vq(s, vq);
+    virtio_scsi_release(s);
+    return progress;
 }
 
 static bool virtio_scsi_data_plane_handle_ctrl(VirtIODevice *vdev,
                                                VirtQueue *vq)
 {
+    bool progress;
     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 
+    virtio_scsi_acquire(s);
     assert(s->ctx && s->dataplane_started);
-    return virtio_scsi_handle_ctrl_vq(s, vq);
+    progress = virtio_scsi_handle_ctrl_vq(s, vq);
+    virtio_scsi_release(s);
+    return progress;
 }
 
 static bool virtio_scsi_data_plane_handle_event(VirtIODevice *vdev,
                                                 VirtQueue *vq)
 {
+    bool progress;
     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 
+    virtio_scsi_acquire(s);
     assert(s->ctx && s->dataplane_started);
-    return virtio_scsi_handle_event_vq(s, vq);
+    progress = virtio_scsi_handle_event_vq(s, vq);
+    virtio_scsi_release(s);
+    return progress;
 }
 
 static int virtio_scsi_vring_init(VirtIOSCSI *s, VirtQueue *vq, int n,