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Subject: Re: [virtio-dev] VIRTIO_BLK_F_CONFIG_WCE removed from virtio 1.0?


On Thu, Jul 02, 2015 at 09:10:42AM +0200, Paolo Bonzini wrote:
> 
> 
> On 02/07/2015 07:08, Michael S. Tsirkin wrote:
> > On Wed, Jul 01, 2015 at 11:50:19PM +0200, Paolo Bonzini wrote:
> >> I guess we were a bit overzealous in removing VIRTIO_BLK_F_FLUSH aka
> >> VIRTIO_BLK_F_WCE.  The VIRTIO_BLK_F_CONFIG_WCE is a useful feature and
> >> should be preserved in order to achieve feature parity between 0.9 and 1.0.
> >>
> >> Sorry for commenting on this so close to the deadline, but I think this
> >> is a blocker. :(  I'll send a patch shortly.
> >>
> >> Paolo
> > 
> > Yes but it's been like this since CS01, correct?
> > I would rather release CS03 as is, work on CS04
> > in parallel.
> > 
> > Do you agree?
> 
> It's the same.  More precisely, I think it is a blocker for starting to
> work on 1.1.

Well we can just fork and work on it in parallel, as long as it's a single patch
I don't think it's a blocker in that sense.

The timeline works out like this.  If we release CS03 as is, then:
- 1 week to prepare a standard
- 1 week to vote on publishing CS03
- 2 weeks to publish

CS03 out end of July, then we start on CS04:

- 1 week to prepare a draft
- 1 week to vote on starting the public review
- 2 weeks to start the public review
- 2 weeks public review

And assuming nothing else surfaces:
- 1 week to prepare a standard
- 1 week to vote on publishing CS03
- 2 weeks to publish

CS04 out mid October.

If we create CSPRD05 and start the public review for that:

- 1 week to prepare a draft
- 1 week to vote on starting the public review
- 2 weeks to start the public review
- 2 weeks public review

And assuming nothing else surfaces:
- 1 week to prepare a standard
- 1 week to vote on publishing CS03
- 2 weeks to publish

CS03 out mid September.

It looks doing CS04 is a win.


> > Also - maybe we can bring back scsi command support as well?
> 
> No, SCSI command was a bad feature to begin with (a hack due to lack of
> virtio-scsi).  It has been deprecated years ago, and cannot be done
> compatibly because it relies on the framing of buffers.  This feature is
> new and useful for performance.
> 
> > Also - pls open an issue tracker.
> 
> Done, VIRTIO-144.
> 
> Paolo
> 
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