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

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Message-ID: <20080711141124.GU14977@amd.com>
Date:	Fri, 11 Jul 2008 16:11:24 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	tglx@...utronix.de, mingo@...hat.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, bhavna.sarathy@....com,
	Sebastian.Biemueller@....com, robert.richter@....com,
	joro@...tes.org
Subject: Re: [PATCH 00/34] AMD IOMMU driver

On Fri, Jul 11, 2008 at 03:22:01AM -0700, Eric W. Biederman wrote:
> Joerg Roedel <joerg.roedel@....com> writes:
> 
> > Hi,
> >
> > this is the first post of the initial driver for AMD IOMMU hardware. The driver
> > is tested on hardware with various loads (disk and network) and showed no
> > problems.
> >
> > It currently supports DMA remapping using the dma_ops API in the x86
> > architecture code. It also supports isolation of device DMA address spaces as
> > far as the hardware allows that (means each device can get its own DMA address
> > space and can't access the DMA memory of other devices).
> >
> > Please give this code a good review and send me your comments about it so that
> > I can fix all possible bugs and objections and move this driver forward to
> > merging quality.
> 
> 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?

Yes, AMD IOMMU also has interrupt remapping support.

> Assuming their is irq remapping support it isn't tied to x2apic
> support in the cpus is it?

Not sure what you mean here. I am not aware of an x2apic on AMD.

Joerg

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