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

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Apr 17, 2013 at 04:28:36PM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Jan Beulich [mailto:JBeulich@suse.com]
> > Sent: Wednesday, April 17, 2013 11:51 AM
> > To: KY Srinivasan; Michael S. Tsirkin
> > Cc: olaf@aepfle.de; bp@alien8.de; apw@canonical.com; x86@kernel.org;
> > tglx@linutronix.de; devel@linuxdriverproject.org; gregkh@linuxfoundation.org;
> > jasowang@redhat.com; linux-kernel@vger.kernel.org; hpa@zytor.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@microsoft.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
> > 
> > 
>