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

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Message-ID: <48E085B3.1080507@redhat.com>
Date:	Mon, 29 Sep 2008 10:37:23 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Alok Kataria <akataria@...are.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Zachary Amsden <zach@...are.com>,
	Dan Hecht <dhecht@...are.com>, Jun.Nakajima@...el.Com
Subject: Re: Use CPUID to communicate with the hypervisor.

Gleb Natapov wrote:
> Can this interface be used to pass variable sized data from a hypervisor
> to a gust? ACPI or DMI tables for instance.
>
>   

In theory it can, but it would be a bad idea.  cpuid is best used to 
communicate cpu features; ACPI and DMI are (mostly) system features.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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