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

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Message-Id: <20081219114808C.fujita.tomonori@lab.ntt.co.jp>
Date:	Fri, 19 Dec 2008 11:47:42 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	beckyb@...nel.crashing.org
Cc:	fujita.tomonori@....ntt.co.jp, jeremy@...p.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	x86@...nel.org, ian.campbell@...rix.com, jbeulich@...ell.com,
	joerg.roedel@....com, benh@...nel.crashing.org
Subject: Re: [PATCH 00 of 14] swiotlb/x86: lay groundwork for xen dom0 use
 of swiotlb

On Thu, 18 Dec 2008 12:17:54 -0600
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.

Ah, thanks,

Then I accept that highmem support in lib/swiotbl.c is generically
useful and we have to live with the ugly complication due to it.
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