Re: [Qemu-devel] [PATCH v1] block/vxhs: Add Veritas HyperScale VxHS block device support

["Daniel P. Berrange" <berrange@redhat.com>]

On Wed, Oct 26, 2016 at 12:41:28AM -0400, Jeff Cody wrote:
> On Tue, Oct 25, 2016 at 03:02:07PM -0700, Ashish Mittal wrote:
> > This patch adds support for a new block device type called "vxhs".
> > Source code for the library that this code loads can be downloaded from:
> > https://github.com/MittalAshish/libqnio.git
> >
> 
> I grabbed the latest of libqnio, compiled it (had to disable -Werror), and
> tried it out.  I was able to do a qemu-img info on a raw file, but it would
> just hang when trying a format such as qcow2.  I am assuming
> this is a limitation of test_server, and not libqnio.
> 
> This will make qemu-iotests more difficult however.
> 
> I haven't looked at the latest qnio code yet (other than compiling the
> test-server to test), so the rest of this review is on the qemu driver.
> 
> > Sample command line using JSON syntax:
> > ./qemu-system-x86_64 -name instance-00000008 -S -vnc 0.0.0.0:0 -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on 'json:{"driver":"vxhs","vdisk_id":"{c3e9095a-a5ee-4dce-afeb-2a59fb387410}","server":[{"host":"172.172.17.4","port":"9999"}]}'
> > 
> > Sample command line using URI syntax:
> > qemu-img convert -f raw -O raw -n /var/lib/nova/instances/_base/0c5eacd5ebea5ed914b6a3e7b18f1ce734c386ad vxhs://192.168.0.1:9999/%7Bc6718f6b-0401-441d-a8c3-1f0064d75ee0%7D
> > 
> > Signed-off-by: Ashish Mittal <ashish.mittal@veritas.com>
> > ---
> >  block/Makefile.objs |   2 +
> >  block/trace-events  |  22 ++
> >  block/vxhs.c        | 736 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  configure           |  41 +++jj
> >  4 files changed, 801 insertions(+)
> >  create mode 100644 block/vxhs.c
> 
> I think this version still does not address Daniel's concerns regarding a
> QAPI schema for vxhs.

Yes, indeed, which makes me question what level of testing this patch
has had - hotplugging for devices is not testable without having the
QAPI schema there.

Regards,
Daniel
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