Messages in this thread | | | Date | Thu, 23 Mar 2006 23:45:07 +0200 | From | Muli Ben-Yehuda <> | Subject | Re: [PATCH 2/3] x86-64: Calgary IOMMU - Calgary specific bits |
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On Thu, Mar 23, 2006 at 09:03:34PM +0200, Muli Ben-Yehuda wrote:
> > > X works :-) > > > > So it's behind a bridge that doesn't have an IOMMU? > > No, it's behind a bridge that does have an IOMMU and is running with > translation enabled (it's on PHB 0 on this machine). I guess you are > concerned with userspace access to the graphics controller directly, > without a kernel driver having set up mapping previously? I will look > into it but emprirically X works so either userspace is not triggering > DMAs or the mappings have been set up by a driver.
Turns out that X does work on my machine (SLES 9SP2) but dies with a bad translation error on Jon's machine, which is otherwise identical except it runs gentoo. We are thinking how to best address this (add IOMMU aware drivers to X? *shudder*), but will disable translation by default on PHB 0 in the mean time for a friendlier user experience.
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