From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [RFC] CPUID usage for interaction between Hypervisors and Linux.
Date: Wed, 01 Oct 2008 11:12:19 -0700
Message-ID: <48E3BD83.2090801@goop.org>
References: <1222881242.9381.17.camel@alok-dev1> <48E3BBC1.2050607@goop.org> <48E3BC47.60900@zytor.com>
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Cc: akataria@vmware.com, "avi@redhat.com" <avi@redhat.com>,
	Rusty Russell <rusty@rustcorp.com.au>,
	Gerd Hoffmann <kraxel@redhat.com>, Ingo Molnar <mingo@elte.hu>,
	the arch/x86 maintainers <x86@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"Nakajima, Jun" <jun.nakajima@intel.com>,
	Dan Hecht <dhecht@vmware.com>,
	Zachary Amsden <zach@vmware.com>,
	virtualization@lists.linux-foundation.org, kvm@vger.kernel.org
To: "H. Peter Anvin" <hpa@zytor.com>
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H. Peter Anvin wrote:
> Jeremy Fitzhardinge wrote:
>>
>> No, we're not getting anywhere.  This is an outright broken idea.  
>> The space is too small to be able to chop up in this way, and the 
>> number of vendors too large to be able to do it without having a 
>> central oversight.
>>
>
> I suspect we can get a larger number space if we ask Intel & AMD.  In 
> fact, I think we should request that the entire 0x40xxxxxx numberspace 
> is assigned to virtualization *anyway*.

Yes, that would be good.  In that case I'd revise my proposal to back 
each leaf block 256 leaves instead of 16.  But it still needs to be a 
proper enumeration with signatures, rather than assigning fixed points 
in that space to specific interfaces.

    J