Re: [PATCH 0 of 2] Support for Paging/Sharing on AMD

[Tim Deegan <tim@xen.org>]

At 07:46 -0700 on 29 Mar (1333007195), Andres Lagar-Cavilla wrote:
> > At 11:43 -0400 on 27 Mar (1332848606), Andres Lagar-Cavilla wrote:
> >> This is a partial repost of the series first sent on Mar 22nd.
> >>
> >> It currently contains two patches
> >> - Teach paging types to p2m-pt.
> >> - Add interlock for iommu and mem paging/sharing.
> >>
> >> The first patch is rebased to apply on top of
> >> http://lists.xen.org/archives/html/xen-devel/2012-03/msg01982.html
> >> and addresses some feedbackfrom Tim Deegan.
> >>
> >> The second patch prevents a passthrough device from being assigned to a
> >> domain
> >> if mem paging or sharing have been turned on. And viceversa. This is a
> >> missing
> >> check that is necessary for both Intel and AMD processors.
> >>
> >> Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
> >
> > Applied, thanks.
> 
> Great, thanks.
> 
> The question now is what to do for AMD+paging in Xen 4.2. It works
> partially, there are still VMEXIT_shutdown hvm crashes happening with pv
> drivers.
> 
> I see two options
> - leave as is, disabled
> - enable it and tag it experimental (printk, documentation, etc)

I'm happy to mark it 'experimental' and put appropriate words in the
release notes about the PV driver problem. 

Tim.