linux-kernel - Re: Use CPUID to communicate with the hypervisor.

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Message-Id: <1222493834.23825.28.camel@alok-dev1>
Date:	Fri, 26 Sep 2008 22:37:14 -0700
From:	Alok Kataria <akataria@...are.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	"avi@...hat.com" <avi@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Zach Amsden <zach@...are.com>,
	Daniel Hecht <dhecht@...are.com>,
	"Jun.Nakajima@...el.Com" <Jun.Nakajima@...el.Com>,
	Tim Deegan <Tim.Deegan@...rix.com>
Subject: Re: Use CPUID to communicate with the hypervisor.

On Fri, 2008-09-26 at 21:20 -0700, H. Peter Anvin wrote:
> Alok Kataria wrote:
> >
> > Avoiding existing leaves,
> > Microsoft's Hypervisor  is using levels 0x40000000 - 0x40000005.
> > The first 2 are standard levels and the rest of them are Microsoft
> > hypervisors specific levels. So started with 0x40000010.
> >
> 
> The first two?  And standard according to whom?
I was just quoting Microsoft's documentation that's available on MSDN.
http://msdn.microsoft.com/en-us/library/bb969724.aspx

Maybe by standard they mean standard definitions for them, the meaning
of the rest of the definitions change according to the value returned by
leaf 0x40000001 (Hypervisor vendor-neutral interface id). 

Thanks,
Alok
> 
>         -hpa

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