Re: [Xen-devel] [PATCH] x86: Expose hypervisor's PVH support via xen_caps

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 05/23/2014 11:20 AM, Andrew Cooper wrote:
> On 23/05/14 16:08, Boris Ostrovsky wrote:
> > On 05/23/2014 11:00 AM, Andrew Cooper wrote:
> > > On 23/05/14 15:55, Boris Ostrovsky wrote:
> > > > Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> > > > ---
> > > >    xen/arch/x86/setup.c | 5 +++++
> > > >    1 file changed, 5 insertions(+)
> > > If the plan is to try and PVH and HVM back into one mode as far as Xen
> > > is concerned, doesn't this become redundant?
> > Yes, I was thinking about this but we currently don't have (or,
> > rather, I can't think of) a good way to determine whether we can start
> > a PVH guest. We can grep the log but that doesn't feel like a
> > particularly good solution.
> >
> > One option could be to postpone this patch until 4.5 freezes and see
> > whether we indeed followed up on the plan and if we didn't then
> > integrate it.
> >
> > -boris
> My concern here is that if this patch gets accepted, it will have to say
> forever more as the cap strings are a very public API.
Yes, that's true.

The problem that we have now is that if we have 'pvh=1' in the config 
file the guest will fail to start if PVH is not on. Can we, for example, 
revert (with a warning) to pure PV if that's the case?
-boris

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