Re: [PATCH] x86: Hyper-V: register clocksource only if its advertised

[Olaf Hering <olaf@aepfle.de>]

On Sat, Jan 26, KY Srinivasan wrote:

> 
> 
> > -----Original Message-----
> > From: Olaf Hering [mailto:olaf@aepfle.de]
> > Sent: Friday, January 25, 2013 3:00 PM
> > To: KY Srinivasan
> > Cc: linux-kernel@vger.kernel.org; Greg KH; Jan Beulich (JBeulich@suse.com)
> > Subject: Re: [PATCH] x86: Hyper-V: register clocksource only if its advertised
> > 
> > On Fri, Jan 25, KY Srinivasan wrote:
> > 
> > > Your current approach of using the "Partition Reference Counter"
> > > feature bit is very fragile. Let us assume that future Windows guests
> > > depend on this feature; Xen would certainly emulate this to have a
> > > "good" emulation of Hyper-V and we are back to square one.
> > 
> > If Xen starts to emulate the "Partition Reference Counter" feature,
> > wouldnt it also advertise this feature?
> 
> Olaf, did you get a chance to investigate why the viridian bit was set
> for the Linux HVM domain.

I dont know, most likely XenServer sets this per default?

> I am thinking of re-sending the patch for delivering the Hyper-V vmbus
> on a separate vector without a run-time check. Let me know.

Are you also acking/nacking this patch?

Olaf