linux-kernel - Re: [PATCH 1/2] VMware guest detection for x86 and x86-64

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Message-ID: <20080925143824.GA31760@yantp.cn.ibm.com>
Date:	Thu, 25 Sep 2008 22:38:25 +0800
From:	Yan Li <elliot.li.tech@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Greg KH <greg@...ah.com>, Yan Li <elliot.li.tech@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	joerg.roedel@....com, rjmaomao@...il.com,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>, nancydreaming@...il.com
Subject: Re: [PATCH 1/2] VMware guest detection for x86 and x86-64

On Wed, Sep 24, 2008 at 09:54:36PM -0700, H. Peter Anvin wrote:
> We pretty much have to, just as we have to work around bugs in, say,  
> AMD's microcode.  We have avoided it so far, but it's gotten to a  
> breaking point, and rather than having ad hoc hacks scattered all over  
> the place I want a centralized test site setting a single global 
> variable.

That sounds great but technically this centralized test can only be
done after dmi_scan_machine(), so it can't help the detection code in
mtrr_trim_uncached_memory() which is ran very early before
dmi_scan_machine(). So I think my patch is still necessary unless we
want to live with the warning message in all VMware guest.

-- 
Li, Yan
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