From: Muli Ben-Yehuda <muli@il.ibm.com>
To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: grundler@google.com, linux-kernel@vger.kernel.org,
mgross@linux.intel.com, linux-scsi@vger.kernel.org
Subject: Re: Intel IOMMU (and IOMMU for Virtualization) performances
Date: Fri, 6 Jun 2008 23:23:24 +0300 [thread overview]
Message-ID: <20080606202324.GR15085@il.ibm.com> (raw)
In-Reply-To: <20080605235322L.fujita.tomonori@lab.ntt.co.jp>
On Thu, Jun 05, 2008 at 11:49:12PM +0900, FUJITA Tomonori wrote:
> > I didn't check....but reserving MMIO address space might be better
> > done by looking at MMIO ranges routed by all the top level PCI
> > Host-bus controllers (aka PCI-e Root ports). Maybe this is an idea
> > for Mark Gross to implement.
>
> Calgary IOMMU code does the similar stuff, but I'm not sure. Anyway,
> as you said, it's about what Mark might be interested in.
I'm not sure it's strictly necessary, but we observed Bad Things(TM)
happening when we gave out DMA addresses that corresponded to MMIO
regions and black-listing those regions seemed the safest thing to do.
Cheers,
Muli
next prev parent reply other threads:[~2008-06-06 20:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-04 14:47 Intel IOMMU (and IOMMU for Virtualization) performances FUJITA Tomonori
2008-06-04 16:56 ` Andi Kleen
2008-06-05 14:49 ` FUJITA Tomonori
2008-06-04 18:06 ` Grant Grundler
2008-06-05 14:49 ` FUJITA Tomonori
2008-06-05 18:34 ` Grant Grundler
2008-06-05 19:01 ` James Bottomley
2008-06-06 4:44 ` FUJITA Tomonori
2008-06-06 5:48 ` Grant Grundler
2008-06-09 9:36 ` FUJITA Tomonori
2008-06-06 20:23 ` Muli Ben-Yehuda [this message]
2008-06-06 20:21 ` Muli Ben-Yehuda
2008-06-06 21:28 ` Grant Grundler
2008-06-06 21:36 ` Muli Ben-Yehuda
2008-06-06 21:51 ` Grant Grundler
2008-06-09 8:17 ` Andi Kleen
2008-06-09 9:36 ` FUJITA Tomonori
2008-06-09 10:20 ` Andi Kleen
2008-06-05 22:02 ` mark gross
2008-06-06 4:44 ` FUJITA Tomonori
2008-06-23 17:54 ` mark gross
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