linux-kernel - RE: [PATCH 00/34] AMD IOMMU driver

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Message-ID: <6453C3CB8E2B3646B0D020C1126132730149A6C6@sausexmb4.amd.com>
Date:	Fri, 11 Jul 2008 11:23:46 -0500
From:	"Duran, Leo" <leo.duran@....com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Roedel, Joerg" <Joerg.Roedel@....com>
CC:	"Richter, Robert" <rrichter@...e.amd.com>,
	"Biemueller, Sebastian" <Sebastian.Biemueller@....com>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
	<mingo@...hat.com>, <tglx@...utronix.de>,
	"Sarathy, Bhavna" <Bhavna.Sarathy@....com>
Subject: RE: [PATCH 00/34] AMD IOMMU driver

On Friday, July 11, 2008 5:22 AM, Eric W. Biederman wrote:

> Small question.  Does this IOMMU also support irq remapping?
> 
> Intel is starting to merge support for their iommu that supports irq
> remapping and I am curious what the implications are going to be to
> support both of these iommus?
> 
> Assuming their is irq remapping support it isn't tied to x2apic
> support in the cpus is it?
> 
Follow-up questions: 
(1) Outside of a virtualization environment, is there functional value
for "irq remapping" by an IOMMU? And, if there is, (2) How would this
functionality get abstracted? (e.g., as dma_ops abstracts 'address
remapping' by the IOMMU)

Leo.

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