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

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Message-ID: <40178.1222435332@turing-police.cc.vt.edu>
Date:	Fri, 26 Sep 2008 09:22:12 -0400
From:	Valdis.Kletnieks@...edu
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Zachary Amsden <zach@...are.com>,
	Alok Kataria <akataria@...are.com>,
	Alok kataria <alokkataria1@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Yan Li <elliot.li.tech@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"joerg.roedel@....com" <joerg.roedel@....com>,
	"rjmaomao@...il.com" <rjmaomao@...il.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Hecht <dhecht@...are.com>
Subject: Re: [PATCH 1/2] VMware detection support for x86 and x86-64

On Fri, 26 Sep 2008 14:47:21 +0200, Gerd Hoffmann said:
>   Hi,
> 
> > This, of course, is what CPUID is for.
> 
> ... except that it doesn't always work.  It requires vmx/svm, otherwise
> cpuid doesn't trap and thus can't be filled by the hypervisor ...

Which would be hardware implementers in the '80s getting wrong the first few
times what IBM did right the first time.  Doesn't *anybody* do literature
searches before doing stuff anymore? ;)

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