linux-kernel - Re: [RFC] CPUID usage for interaction between Hypervisors and Linux.

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Date:	Wed, 01 Oct 2008 10:47:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	akataria@...are.com
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	"avi@...hat.com" <avi@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Gerd Hoffmann <kraxel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Nakajima, Jun" <jun.nakajima@...el.com>,
	Dan Hecht <dhecht@...are.com>,
	Zachary Amsden <zach@...are.com>,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org
Subject: Re: [RFC] CPUID usage for interaction between Hypervisors and Linux.

Alok Kataria wrote:
> 
> Hypervisor CPUID Interface Proposal
> -----------------------------------
> 
> Intel & AMD have reserved cpuid levels 0x40000000 - 0x400000FF for
> software use.  Hypervisors can use these levels to provide an interface
> to pass information from the hypervisor to the guest running inside a
> virtual machine.
> 
> This proposal defines a standard framework for the way in which the
> Linux and hypervisor communities incrementally define this CPUID space.
> 

I also observe that your proposal provides no mean of positive 
identification, i.e. that a hypervisor actually conforms to your proposal.

	-hpa
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