linux-kernel - Re: [PATCH -v2 1/2] x86: Reserve [0xa0000, 0x100000] in e820 map

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Message-ID: <4BC4E55B.7000103@oracle.com>
Date:	Tue, 13 Apr 2010 14:42:51 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andy Isaacson <adi@...apodia.org>, guenter.roeck@...csson.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"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>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH -v2 1/2] x86: Reserve [0xa0000, 0x100000] in e820 map

On 04/13/2010 02:18 PM, H. Peter Anvin wrote:
> On 04/13/2010 02:11 PM, Yinghai wrote:
>>>
>>> I guess the real question (which I haven't looked at myself) is if the
>>> E820_RESERVED -> BUSY will cause an explicitly assigned BAR from being
>>> moved.  That's bad, not so much for this particular range, but from BARs
>>> which may be assigned by SMM.  Hacking that up in a simulator
>>> (Qemu/Bochs) and testing it is probably on the to do list...
>>
>> no, if some device BAR fall in that range, it should still use that range, and will not be relocated.
>>
>> will update the change log.
>>
> 
> Good, that's what we want.

the driver for that device later can not use pci_request_region(). because that region is BUSY already.

YH

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