Re: [Xen-devel] Xen blktap driver for Ceph RBD : Anybody wants to test ? :p

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 05/08/13 16:18, Wei Liu wrote:
> On Mon, Aug 05, 2013 at 03:04:47PM +0100, George Dunlap wrote:
> > On 05/08/13 14:55, Sylvain Munaut wrote:
> > > Hi George,
> > >
> > >
> > > > Yes; qemu knows how to be a Xen PV block back-end.
> > > Very interesting. Is there documentation about this somewhere ?
> > > I had a look some time ago and it was really not very clear.
> > >
> > > Things like what Xen version support this. And with which features (
> > > indirect descriptors, persistent grants, discard, flush, ...) and/or
> > > which limitation.
> > I don't think this is documented anywhere; you'll need to ask the
> > experts.  Stefano? Roger? Wei?
> These are Linux features not Xen ones AFAICT. In theory they are not
> bound to specific Xen versions.
>
> For the network part I don't think new features depend on any specific
> hypercall. However for block Roger and Stefano seem to introduce
> new hypercalls for certain features (I might be wrong though).
We're talking about qemu; so the toolstack needs to know how to set up 
qdisk, and I think qdisk would need to be programmed to use, for 
example, persistent grants, yes?
 -G


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