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

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Message-ID: <20130418074810.GI13787@redhat.com>
Date:	Thu, 18 Apr 2013 10:48:10 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Jan Beulich <JBeulich@...e.com>, "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

On Wed, Apr 17, 2013 at 04:28:36PM +0000, KY Srinivasan wrote:
> 
> 
> > -----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

Parse error. What are you trying to say? I'm just saying it's best to do
things in the way that make it possible for Xen to implement hyperv in a
more complete way in the future and have things just work
and in a way that does not change guest/hypervisor interface.

> > 
> > Jan
> > 
> > 
> 
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