linux-kernel - RE: [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V

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Date:	Wed, 17 Apr 2013 16:28:36 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Jan Beulich <JBeulich@...e.com>,
	"Michael S. Tsirkin" <mst@...hat.com>
CC:	"olaf@...fle.de" <olaf@...fle.de>, "bp@...en8.de" <bp@...en8.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>
Subject: RE: [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V



> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@...e.com]
> Sent: Wednesday, April 17, 2013 11:51 AM
> To: KY Srinivasan; Michael S. Tsirkin
> Cc: olaf@...fle.de; bp@...en8.de; apw@...onical.com; x86@...nel.org;
> tglx@...utronix.de; devel@...uxdriverproject.org; gregkh@...uxfoundation.org;
> jasowang@...hat.com; linux-kernel@...r.kernel.org; hpa@...or.com
> Subject: RE: [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V
> 
> >>> On 17.04.13 at 17:31, KY Srinivasan <kys@...rosoft.com> wrote:
> > If Xen were to change where it would not unconditionally emulate Hyper-V, I
> > would not be opposed to taking
> > this check out.
> 
> But it doesn't do this unconditionally, only upon admin request.

>From the discussion we had a couple of months ago, the default setting was to enable
Hyper-V emulation for all guests. If this is not the case, we ought to be able to drop this.
However, I think it is not reasonable to add additional checks (in addition to hypervisor check)
to customize the run-time in the guest for the specific Hypervisor.

Regards,

K. Y
> 
> Jan
> 
> 


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