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

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Message-ID: <20081001214338.GD634@sequoia.sous-sol.org>
Date:	Wed, 1 Oct 2008 14:43:38 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, akataria@...are.com,
	"avi@...hat.com" <avi@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Gerd Hoffmann <kraxel@...hat.com>,
	"H. Peter Anvin" <hpa@...or.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>,
	Daniel Hecht <dhecht@...are.com>,
	Zach Amsden <zach@...are.com>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [RFC] CPUID usage for interaction between Hypervisors and
	Linux.

* Anthony Liguori (anthony@...emonkey.ws) wrote:
> And arguably, storing TSC frequency in CPUID is a terrible interface  
> because the TSC frequency can change any time a guest is entered.  It  

True for older hardware, newer hardware should fix this.  I guess the
point is, the are numbers that are easy to measure incorrectly in guest.
Doesn't justify the whole thing..
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