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Revert "vhost-blk: set features before setting inflight feature" 

This reverts commit adb29c0273.

The commit broke -device vhost-user-blk-pci because the
vhost_dev_prepare_inflight() function it introduced segfaults in
vhost_dev_set_features() when attempting to access struct vhost_dev's
vdev pointer before it has been assigned.

To reproduce the segfault simply launch a vhost-user-blk device with the
contrib vhost-user-blk device backend:

  $ build/contrib/vhost-user-blk/vhost-user-blk -s /tmp/vhost-user-blk.sock -r -b /var/tmp/foo.img
  $ build/qemu-system-x86_64 \
        -device vhost-user-blk-pci,id=drv0,chardev=char1,addr=4.0 \
        -object memory-backend-memfd,id=mem,size=1G,share=on \
        -M memory-backend=mem,accel=kvm \
        -chardev socket,id=char1,path=/tmp/vhost-user-blk.sock
  Segmentation fault (core dumped)

Cc: Jin Yu <jin.yu@intel.com>
Cc: Raphael Norwitz <raphael.norwitz@nutanix.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20201102165709.232180-1-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-11-02 16:57:09 +00:00 committed by Michael S. Tsirkin
parent 1bc211a166
commit b7c1bd9d78
3 changed files with 0 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
hw/block/vhost-user-blk.c
View File

@ -131,12 +131,6 @@ static int vhost_user_blk_start(VirtIODevice *vdev)
s->dev.acked_features = vdev->guest_features;
ret = vhost_dev_prepare_inflight(&s->dev);
if (ret < 0) {
error_report("Error set inflight format: %d", -ret);
goto err_guest_notifiers;
}
if (!s->inflight->addr) {
ret = vhost_dev_get_inflight(&s->dev, s->queue_size, s->inflight);
if (ret < 0) {

18
hw/virtio/vhost.c
View File

@ -1645,24 +1645,6 @@ int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f)
return 0;
}
int vhost_dev_prepare_inflight(struct vhost_dev *hdev)
{
int r;
if (hdev->vhost_ops->vhost_get_inflight_fd == NULL ||
hdev->vhost_ops->vhost_set_inflight_fd == NULL) {
return 0;
}
r = vhost_dev_set_features(hdev, hdev->log_enabled);
if (r < 0) {
VHOST_OPS_DEBUG("vhost_dev_prepare_inflight failed");
return r;
}
return 0;
}
int vhost_dev_set_inflight(struct vhost_dev *dev,
struct vhost_inflight *inflight)
{

1
include/hw/virtio/vhost.h
View File

@ -141,7 +141,6 @@ void vhost_dev_reset_inflight(struct vhost_inflight *inflight);
void vhost_dev_free_inflight(struct vhost_inflight *inflight);
void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f);
int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f);
int vhost_dev_prepare_inflight(struct vhost_dev *hdev);
int vhost_dev_set_inflight(struct vhost_dev *dev,
struct vhost_inflight *inflight);
int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,