Re: [Xen-devel] about fully UMIP support in Xen

[Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>]

On 4/20/2017 6:23 PM, Andrew Cooper wrote:
> On 20/04/17 11:10, Yu Zhang wrote:
> > On 4/20/2017 6:01 PM, Jan Beulich wrote:
> > > > > > On 20.04.17 at 11:53, <yu.c.zhang@xxxxxxxxxxxxxxx> wrote:
> > > > On 4/20/2017 5:47 PM, Jan Beulich wrote:
> > > > > > > > On 20.04.17 at 09:15, <yu.c.zhang@xxxxxxxxxxxxxxx> wrote:
> > > > > > And back to the schedule of this feature, are you working on it?
> > > > > > Or any
> > > > > > specific plan?
> > > > > Well, the HVM side is basically ready (as said, the single hunk needed
> > > > > to support UMIP when hardware supports it could be easily split off of
> > > > > my emulation patch). For the PV side I don't currently have any plans
> > > > > to do any work.
> > > > Thanks, Jan. So do you have plan to push the HVM support in Xen 4.10?
> > > We're moving in circles, it feels. My patch depends on Andrew
> > > making progress. Breaking out the one mentioned hunk could
> > > of course be done at any time, if we have indication that UMIP
> > > hardware support will actually arrive and it becomes unlikely
> > > for the patch to be able to go in as a whole in time for 4.10.
> > I can understand. And please let me know if there's any help we can
> > offer here in Intel. :-)
> I have no immediate plans to do any UMIP work, again because I lack any
> hardware to suitably test it on.
>
> If Intel have time, exposing hardware UMIP support to HVM guests would
> be useful work, and hopefully trivial to do.  (Ideally with an XTF
> regression test.)
Got it. We have simics to emulate the new cpu platform. So we can take 
over this part.
As to the PV support, I'm not sure if we have time to do so in the short 
time, but it's not
urgent for us. :)

Yu

> ~Andrew

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