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Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses


From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses
Date: Wed, 20 Jul 2011 16:27:08 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666

On 2011-07-20 14:15, Jan Kiszka wrote:
> On 2011-07-20 14:00, Isaku Yamahata wrote:
>> Hi. This clean up looks good basically.
> 
> Oops, forgot to cc you. Sorry.
> 
>> But when conventional pci device is accessed via MMCONFIG area,
>> addr &= addr_mask doesn't work as expected.
>> The config area of [256, 4K) of conventional pci should have no effect.
> 
> Mmh, I see. Looks like we need to split accesses at this boundary and
> executed them separately.

Nope, no such issue: we already automatically split up accesses that
span the legacy/extended boundary. Just like so far, legacy config space
handlers have to filter out requests that address regions >= 256.

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux



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