Messages in this thread |  | | | Date | Thu, 7 May 2009 21:59:19 +0900 | | Subject | Re: IOMMU and graphics cards | | From | FUJITA Tomonori <> |
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On Thu, 7 May 2009 14:15:35 +0200 Joerg Roedel <joerg.roedel@amd.com> wrote:
> On Thu, May 07, 2009 at 11:22:01AM +0100, David Woodhouse wrote: > > On Thu, 2009-05-07 at 12:01 +0200, Joerg Roedel wrote: > > > > Looks like the DRM code uses the DMA API. > > > > > > The proprietary drivers make problems so far. For the ATI one I am in > > > contact with the developers to try to fix it. But I can't do anything > > > about the other proprietary driver I am aware of :-( > > > > I see no harm in "breaking" code which was already broken. If that's the > > only reason we're enabling the graphics workaround, let's turn it off. > > Well, it is not that simple. Having no workaround at all will not result > in working proprietary drivers. More likely is that distros just disable > the IOMMU because their customers want to use these drivers for working > 3d acceleration.
Have you already discussed this issue with distribution people?
I'm not sure if they would just disable the IOMMU. They want it for exotic virtualization features?
> As I wrote in the original mail I think we should just make sure that > these drivers still work with an IOMMU without disabling device > isolation.
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