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

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Message-ID: <48DB1BCE.2070106@zytor.com>
Date:	Wed, 24 Sep 2008 22:04:14 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	akataria@...are.com
CC:	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>, Zach Amsden <zach@...are.com>
Subject: Re: [PATCH 1/2] VMware detection support for x86 and x86-64

Alok Kataria wrote:
>>>
>> You accessed a bloody I/O port!
>>
>> If you think it's harmless because it was an IN, you're sorely mistaken.
> 
> Hi Peter, 
> 
> It would be really helpful if you could explain me when can this go
> wrong or what kinds of problems can this cause on native hardware.
> 

You accessed an unknown I/O port.

This means you caused an unknown action in an unknown peripheral device.

This could cause ANYTHING to happen.

	-hpa

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