linux-kernel - Re: [PATCH 2/2] Suppress false "mtrr all empty" warning message when running as VMware guest

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Message-ID: <20081005120536.GA4543@yantp.cn.ibm.com>
Date:	Sun, 5 Oct 2008 20:05:36 +0800
From:	Yan Li <elliot.li.tech@...il.com>
To:	Pavel Machek <pavel@...e.cz>
Cc:	Yan Li <elliot.li.tech@...il.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	joerg.roedel@....com, rjmaomao@...il.com,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>, nancydreaming@...il.com
Subject: Re: [PATCH 2/2] Suppress false "mtrr all empty" warning message
	when running as VMware guest

On Wed, Oct 01, 2008 at 10:03:51PM +0200, Pavel Machek wrote:
> Hi!
> 
> Subject says: Suppress false "mtrr all empty"  .... would you explain
> why is the message false? I believe it is very true, and points out
> fact that VMWare virtualization fails to simulate MTRR-s.
> 
> IMO VMWare should just fix their emulator.

You are right, to some degree. Actually I have no strong evidence to
support this either.  Since KVM doesn't set MTRR, by hunch I thought
VMware might having similar shortages. Also nothing bad can be
observed after the system booted, so I guessed that warning was
useless. Moreover, none other OSes (include old Linux kernels) is
complaining about this in VMware so users of VMware might think 2.6.27
is buggy on this.

Hope someone from VMware could clear this up.  I think they are
working on this problem followed this thread. I'd be happy to help.

-- 
Li, Yan
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