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    SubjectRe: [patch 0/8] [Intel IOMMU] Support for Intel Virtualization Technology for Directed I/O
    On Tue, Apr 10, 2007 at 03:57:28PM +0800, Shaohua Li wrote:
    > On Tue, 2007-04-10 at 09:49 +0200, Andi Kleen wrote:
    > > On Monday 09 April 2007 23:55:52 Ashok Raj wrote:
    > >
    > > > Please help review and provide feedback.
    > >
    > > High level question: how did you solve the "user X server needs IOMMU bypass"
    > > problem?

    > Please see patch 5. We have two workarounds for graphics. One is
    > completely bypass dma remapping for gfx, this option only works for
    > gfx card with dedicated dma remapping engine. The other is doing 1-1
    > mapping for whole physical memory address, then virtual dma address
    > will equal to physical address, so gfx can ignore iommu in the case.

    Apologies but I've not had a chance to review the patches yet. Do you
    special case the BDF of the graphics adpater (via PCI ID?), or does
    the user need to provide a command line option to specify the graphics
    adapter?

    Cheers,
    Muli
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