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

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Date:	Wed, 24 Sep 2008 21:38:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alok kataria <alokkataria1@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Yan Li <elliot.li.tech@...il.com>,
	linux-kernel@...r.kernel.org, joerg.roedel@....com,
	rjmaomao@...il.com, Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>, akataria@...are.com,
	Daniel Hecht <dhecht@...are.com>,
	Zachary Amsden <zach@...are.com>
Subject: Re: [PATCH 1/2] VMware detection support for x86 and x86-64

Alok kataria wrote:
> 
> Even if there is anything on that port on native hardware it would
> work perfectly well and is _safe_.
> First let me post the code to access this backdoor port (the way it
> should really be done )
> 
> So whenever we query port  0x5658 , with the GETVERSION command (which
> is the first thing we do with this port), we expect that  eax !=
> 0xFFFFFFFF   and ebx has a  VMWARE specific MAGIC value.  Please note
> that ebx has been initialized to zero in the code above.
> 

You have no idea what you just did to a real piece of hardware.

	-hpa
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