linux-kernel - Re: [GIT PULL] xen: swiotlb support for Xen dom0

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Message-ID: <20090511130455.GO13954@elte.hu>
Date:	Mon, 11 May 2009 15:04:55 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [GIT PULL] xen: swiotlb support for Xen dom0


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Hi Ingo,
> 
> This branch adds the swiotlb hooks for Xen dom0.  We use swiotlb 
> to handle various device drivers which assume that multipage DMA 
> transfers which are contigious in kernel memory are also 
> contigious in machine memory (mostly lower-performance devices, as 
> high-performance ones already do a good job of scatter-gather).
> 
> Following Fujita's suggestion, these changes remove a lot of the 
> placeholder stubs in arch/x86/kernel/pci-swiotlb.c and moves them 
> into the Xen-specific arch/x86/xen/pci-swiotlb.c.  (It still 
> relies on overriding the weak functions defined in lib/swiotlb.c.)
> 
> The following changes since commit 2af252ab26150b4411889c9eaf1af4c5bf03de78:
>   Jeremy Fitzhardinge (1):
>         xen: checkpatch cleanups

Would be nice to have a pull request for this with Fujita-san's acks 
embedded in the commits, and with a tree based against tip:x86/xen.

	Ingo
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