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

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?


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