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    SubjectRe: IOMMU and graphics cards
    From
    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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