Re: [Xen-devel] Xen 4.3 development update

[Matt Wilson <msw@xxxxxxxxxx>]

On Wed, Sep 26, 2012 at 11:25:54AM +0100, Thanos Makatos wrote:
> > -----Original Message-----
> > From: George Dunlap [mailto:george.dunlap@xxxxxxxxxxxxx]
> > Sent: 26 September 2012 10:37
> > To: Matt Wilson
> > Cc: Jan Beulich; xen-devel@xxxxxxxxxxxxx; Thanos Makatos
> > Subject: Re: [Xen-devel] Xen 4.3 development update
> > 
> > On 21/09/12 04:18, Matt Wilson wrote:
> > > On Thu, Sep 20, 2012 at 08:03:11AM +0100, Jan Beulich wrote:
> > >>> On 19.09.12 at 18:58, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
> > wrote:
> > >>> * Persistent grants
> > >>>    owner: @citrix
> > >>>    status: ?
> > >> Isn't that a guest side only thing (i.e. not really to be tracked
> > >> here)? Or does that mean migrating active grants?
> > > I'd assume that the device would be renegotiated during migration,
> > and
> > > that new grants would be established during the re-connect sequence.
> > >
> > > One question I have is how persistent grants intersect with blktap3.
> > > Will a persistent grant-capable blktap3 implementation be in scope
> > for
> > > 4.3?
> > Thanos is working on blktap3 -- Thanos, can you comment?
> 
> Supporting this in 4.3 is not top priority; however I'll do it if I
> have time.

I brought this up in response to Jan's question as to if persistent
grants should be on the 4.3 release plan. With the introduction of
blktap3, we have a separate implementation of the protocol in a Xen
component. One worry I have about blktap3 is that it will lag behind
the in-kernel blkback implementation.

> > >>> * Multi-page blk rings
> > >>>   - blkback in kernel (konrad@oracle, ?@intel)
> > >> This part certainly is a guest side only thing (apart from the
> > >> interface definition living in the our tree).
> > > Same question here regarding blktap3.
> > And here.
> 
> I'm not sure I understand the question, blktap3 doesn't talk to
> blkback at all, but to blkfront directly -- are you referring to
> blkfront?

blktap3 would need to implement the new multi-page blk ring protocol,
correct?

Matt

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