linux-kernel - Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well as x86

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Message-ID: <4BBF89FE.5040909@zytor.com>
Date:	Fri, 09 Apr 2010 13:11:42 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	guenter.roeck@...csson.com
CC:	Yinghai <yinghai.lu@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Isaacson <adi@...apodia.org>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well
 as x86_32

On 04/09/2010 11:55 AM, Guenter Roeck wrote:
> On Fri, 2010-04-09 at 14:23 -0400, H. Peter Anvin wrote:
>> [Adding Guenter Roeck as he was commenting on something writing to the
>> VGA area...]
>>
>> On 04/09/2010 10:22 AM, Yinghai wrote:
>>>
>>> then please check this one
>>>
>>> update e820 at first, and later put them resource tree, but give pci BAR chance to claim
>>> the range, before assign unassigned resources.
>>>
>>> in case some system doesn't have VGA, and use [0xa0000, ..] for mmio of some other pci devices.
>>>
>>
>> Do we have any evidence of any such system?
>>
>> Either which way, the patch looks saner...
>>
> Yes, we have a system which does not have VGA and uses the VGA memory
> space for another device. I don't know exactly what for, but I can find
> out if it is relevant.
> 

Quite.  We really need to consider if that kind of devices should be
supported.

	-hpa
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