Re: [Xen-devel] RFC: Still TODO for 4.2? Nested Paging for Intel Nested Virt

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Jan 05, 2012 at 10:39:20AM +0000, Ian Campbell wrote:
> 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.
> 

Yep. 

Intel guys: Any plans to implement Nested Paging for Nested Virt ? 


> > 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).
> 

Makes sense.

-- Pasi


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