VIRTIO_F_IO_BARRIER: use I/O barriers in driver

There will be hardware virtio devices in the future, which
require drivers to use the barriers suitable for I/O devices,
compared with software virtio devices which just require
drivers to use the barriers suitable for CPU cores.

To fix the ordering issue for hardware virtio devices, add
a new feature: VIRTIO_F_IO_BARRIER. When negotiated, driver
will use the barriers suitable for I/O devices.

Fixes: https://github.com/oasis-tcs/virtio-spec/issues/10
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

0 files changed, 0 insertions, 0 deletions