linux-kernel - RE: [kvm-devel] [PATCH] Refactor hypercall infrastructure

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Date:	Fri, 14 Sep 2007 15:40:29 -0700
From:	"Nakajima, Jun" <jun.nakajima@...el.com>
To:	"Anthony Liguori" <anthony@...emonkey.ws>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	<kvm-devel@...ts.sourceforge.net>, <linux-kernel@...r.kernel.org>,
	"Avi Kivity" <avi@...ranet.com>
Subject: RE: [kvm-devel] [PATCH] Refactor hypercall infrastructure

Anthony Liguori wrote:
> Jeremy Fitzhardinge wrote:
> > Anthony Liguori wrote:
> > 
> > > Yeah, see, the initial goal was to make it possible to use the KVM
> > > paravirtualizations on other hypervisors.  However, I don't think
this
> > > is really going to be possible in general so maybe it's better to
just
> > > use leaf 0.  I'll let others chime in before sending a new patch.
> > > 
> > 
> > Hm.  Obviously you can just define a signature for "kvm-compatible
> > hypercall interface" and make it common that way, but it gets tricky
if
> > the hypervisor supports multiple hypercall interfaces, including the
kvm
> > one.  Start the kvm leaves at 0x40001000 or something?
> > 
> 
> Yeah, that works with me.

To me this is the beginning of fragmentation. Why do we need different
and VMM-specific Linux paravirtualization for hardware-assisted
virtualization? That would not be good for Linux.

> 
> Regards,
> 
> Anthony Liguori
> 
> >     J

Jun
---
Intel Open Source Technology Center
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