linux-kernel - Re: [PATCH 00 of 14] swiotlb/x86: lay groundwork for xen dom0 use of swiotlb

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Date:	Thu, 18 Dec 2008 22:02:31 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Becky Bruce <beckyb@...nel.crashing.org>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	xen-devel@...ts.xensource.com, x86@...nel.org,
	ian.campbell@...rix.com, jbeulich@...ell.com, joerg.roedel@....com,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 00 of 14] swiotlb/x86: lay groundwork for xen dom0 use
	of swiotlb


* Becky Bruce <beckyb@...nel.crashing.org> wrote:

>> Can you be more specific? What architecture is plan to use highmem 
>> support in swiotlb?
>
> 32-bit powerpc needs this support - I was actually about to push a 
> similar set of patches.  We have several processors that support 36 bits 
> of physical address space and do not have any iommu capability.  The 
> rest of the kernel support for those processors is now in place, so 
> swiotlb is the last piece of the puzzle for that to be fully functional.  
> I need to take a closer look at this series to see exactly what it's 
> doing and how it differs from what I've been testing.
>
> So there is another immediate use case, and I'd really hate to see this 
> code duplicated.  It should be entirely possible to remove the 
> assumption that we can save off the VA of the original buffer, which is 
> the thing that precludes HIGHMEM support, and still have nice readable, 
> maintainable code.

you can have a look at Jeremy's current lineup of patches in 
tip/core/iotlb:

   http://people.redhat.com/mingo/tip.git/README

(also integrated into tip/master)

What would be needed to make it suit your usecase too?

	Ingo
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