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

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Message-ID: <2f4f2b37780440a99bb75a33efc3f3c6@SN2PR03MB061.namprd03.prod.outlook.com>
Date:	Fri, 25 Jan 2013 20:03:46 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Olaf Hering <olaf@...fle.de>
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



> -----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?

Yes; it has to - if it expects the Windows guests to use it. This would be
no different than the other features that Xen emulates and advertises.

K. Y