| Date | Fri, 28 Nov 2014 13:56:00 +0100 | From | Cornelia Huck <> | Subject | Re: [PATCH v6 06/46] virtio_ccw: add support for 64 bit features. |
| |
On Thu, 27 Nov 2014 22:08:09 +0200 "Michael S. Tsirkin" <mst@redhat.com> wrote:
> Negotiate full 64 bit features. > Change u32 to u64, make sure to use 1ULL everywhere. > > Note: devices guarantee that VERSION_1 is clear unless > revision 1 is negotiated. > > Based on patches by Rusty, Thomas Huth and Cornelia. > > Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> > Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com> > --- > drivers/s390/kvm/virtio_ccw.c | 30 +++++++++++++++++++++++------- > 1 file changed, 23 insertions(+), 7 deletions(-) >
> @@ -691,6 +691,16 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev) > > rc = le32_to_cpu(features->features); > > + /* Read second half feature bits from the host. */
s/half feature bits/half of the feature bits/
> + features->index = 1; > + ccw->cmd_code = CCW_CMD_READ_FEAT; > + ccw->flags = 0; > + ccw->count = sizeof(*features); > + ccw->cda = (__u32)(unsigned long)features;
We don't need to re-setup the ccw, but it probably doesn't hurt for clarity.
> + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); > + if (ret == 0) > + rc |= (u64)le32_to_cpu(features->features) << 32; > + > out_free: > kfree(features); > kfree(ccw);
Looks good.
|