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

[Michael S. Tsirkin]

On Wed, Apr 17, 2013 at 04:28:36PM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> > Sent: Wednesday, April 17, 2013 11:51 AM
> > To: KY Srinivasan; Michael S. Tsirkin
> > Cc: olaf@xxxxxxxxx; bp@xxxxxxxxx; apw@xxxxxxxxxxxxx; x86@xxxxxxxxxx;
> > tglx@xxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx;
> > jasowang@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; hpa@xxxxxxxxx
> > 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@xxxxxxxxxxxxx> 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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