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

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Message-ID: <20130126182114.GA26786@aepfle.de>
Date:	Sat, 26 Jan 2013 19:21:15 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	"Jan Beulich (JBeulich@...e.com)" <JBeulich@...e.com>
Subject: Re: [PATCH] x86: Hyper-V: register clocksource only if its advertised

On Sat, Jan 26, KY Srinivasan wrote:

> 
> 
> > -----Original Message-----
> > From: Olaf Hering [mailto:olaf@...fle.de]
> > Sent: Friday, January 25, 2013 3:00 PM
> > To: KY Srinivasan
> > Cc: linux-kernel@...r.kernel.org; Greg KH; Jan Beulich (JBeulich@...e.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
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