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Re: [Qemu-devel] [PATCH 17/30] memory: add address_space_translate

From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH 17/30] memory: add address_space_translate
Date: Mon, 27 May 2013 09:23:21 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2013-05-27 09:20, Paolo Bonzini wrote:
> Il 26/05/2013 11:02, Jan Kiszka ha scritto:
>>>> Nice patches.  Only one thing, how is .impl.unaligned different
>>>> from the existing .valid.unaligned?
>> See memory.h: valid controls is an unaligned access traps or gets
>> processed, impl manages if it is passed as-is to the device or
>> broken up and aligned first.
> I took the following patches:
>     exec: Allow unaligned address_space_rw
>     exec: Resolve subpages in one step except for IOTLB fills
>     exec: Implement subpage_read/write via address_space_rw
> to limit the conflicts and because I realized that TCG should never
> encounter an IOMMU.

Err, why? Will we emulate IOMMUs for TCG differently?

>  Thus I removed the is_write argument from
> address_space_translate_internal and moved the IOMMU handling to
> address_space_translate.  I'll push to my iommu branch after some more
> testing.  If you reorganize the old_portio handling along the lines I
> suggested in my previous email you should have no conflicts when rebasing.

old_portio should rather be eliminated on the long run. But that's a
future story.


Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux

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