linux-kernel - Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing

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Message-ID: <20080921052750.GM6990@il.ibm.com>
Date:	Sun, 21 Sep 2008 08:27:50 +0300
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Ashok Raj <ashok.raj@...el.com>, Shaohua Li <shaohua.li@...el.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Joerg Roedel <joerg.roedel@....com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 03/23] AMD IOMMU: implement lazy IO/TLB flushing

On Fri, Sep 19, 2008 at 07:43:39PM +0200, Joerg Roedel wrote:
> Hi All,
> 
> FUJITA mentioned that I forgot to discuss this patch with you guys, the
> implementers and maintainers for Intel VT-d and Calgary IOMMU drivers. I
> would like to hear your opinion on that patch. He is right with that.
> The patch is already in tip/iommu but can easily be reverted if there
> are fundamental objections.
> The patch basically moves the iommu=fullflush and iommu=nofullflush
> option from the GART code to pci-dma.c. So we can use these parameters
> in other IOMMU implementations too. Since Intel VT-d is implementing
> also lazy IO/TLB flushing it would benefit from this generic parameter
> too. I am not so sure about Calgary, but we have other parameters for
> iommu= which doesn't affect all hardware IOMMUs.

Calgary can't use fullflush, but in general the more unified our IOMMU
options, the better for the users. It's a pain to have to remember
which option applies to which IOMMU implementation.

Cheers,
Muli
-- 
Workshop on I/O Virtualization (WIOV '08)
Co-located with OSDI '08, Dec 2008, San Diego, CA
http://www.usenix.org/wiov08
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