Re: [Qemu-devel] virtio-blk io bar size changed

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Feb 12, 2019 at 01:59:38AM +0000, Liu, Changpeng wrote:
> 
> 
> > -----Original Message-----
> > From: Michael S. Tsirkin [mailto:mst@redhat.com]
> > Sent: Tuesday, February 12, 2019 1:23 AM
> > To: Dr. David Alan Gilbert <dgilbert@redhat.com>
> > Cc: qemu-devel@nongnu.org; Liu, Changpeng <changpeng.liu@intel.com>;
> > stefanha@redhat.com; ldoktor@redhat.com
> > Subject: Re: virtio-blk io bar size changed
> > 
> > On Mon, Feb 11, 2019 at 04:58:19PM +0000, Dr. David Alan Gilbert wrote:
> > > Hi,
> > >   Lukáš reported that there's a migration breakage between 3.1 and
> > > current head with virtio-blk;   it looks like the io bar changes from 64
> > > to 128 bytes and my bisect suggests it's:
> > >
> > > commit caa1ee43131c060347b32893abd41fe4865eaa2e (HEAD, refs/bisect/bad)
> > > Author: Changpeng Liu <changpeng.liu@intel.com>
> > > Date:   Wed Jan 16 13:19:30 2019 +0800
> > >
> > >     vhost-user-blk: add discard/write zeroes features support
> > >
> > >
> > > How do we fix that?
> > >
> > > Dave
> > 
> > Quickly :)
> > 
> > See the logic around virtio_net_set_config_size
> > and static VirtIOFeature feature_sizes - we need to
> > add something similar to virtio blk now.
> Correct, after this commit the BAR config size is changed, I will submit a patch to fix this.

Thanks!

> > 
> > 
> > > --
> > > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK