Re: [Xen-devel] RFC: Still TODO for 4.2?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2012-01-04 at 18:20 +0000, Tim Deegan wrote:
> At 19:25 +0200 on 04 Jan (1325705119), Pasi K?rkk?inen wrote:
> > On Wed, Jan 04, 2012 at 04:29:22PM +0000, Ian Campbell wrote:
> > > What are the outstanding things to do before we think we can start on
> > > the 4.2 -rc's? Does anyone have a timetable in mind?
> > > 
> > > hypervisor:
> > > 
> > >       * ??? - Keir, Tim, Jan?
> 
> I would like to get the interface changes for sharing/paging/mem-events
> done and dusted so that 4.2 is a stable API that we hold to.
> 
> It would be nice to get the implementation solid too (i.e., using wait
> queues) but that can happen later if it's the only thing holding up a
> release.
> 
> > - What's the status of Nested Hardware Virtualization? 
> > I remember some email saying Intel vmx-on-vmx has some performance issues,
> > and amd svm-on-svm works better..

That's the impression that I've gotten too.

> The basic feature is in for AMD and Intel, but AIUI it's not getting a
> lot of use and it's not in the xen.org automated testing.  The AMD code
> has nested-paging support too, which is a requirement for decent
> performance. 
> 
> We could call it 'experimental' for 4.2?

IMHO we shouldn't hold up the release for it so either it is working by
the time the release happens or it is experimental. (I guess we should
consider svm-on-svm and vmx-on-vmx separately for these purposes).

Ian.



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