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    SubjectRe: [PATCH 7/7] Intel pci: Indicate 64-bit IOMMU passthrough available
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    On Thu, 2011-05-26 at 20:32 -0500, Mike Travis wrote:
    > Prior to these IOMMU patches, the passthrough option
    > could not be used because it would cause the kernel to
    > panic.

    Could not be used on certain hardware? In certain configurations? It
    wasn't just *completely* broken (unless it got broken in a recent
    regression).

    > Provide an indication that a kernel is capable
    > of handling passthrough mode through the introduction
    > of a specific variable name. This allows automatic
    > configuration utilities to set the "iommu=pt" kernel
    > cmdline option safely.

    That implies that there is a follow-up patch to somehow export this
    information to userspace? Where the information in question is just the
    fact that a certain set of bugs have been fixed?

    Since these *are* actually bugs, and not new features, I take it we're
    looking at merging them for 2.6.40? I was planning to ask Linus to pull
    my tree today, and I'm not entirely happy with merging them at the last
    minute.

    So I'll plan to merge them into my tree after the outstanding merge, and
    then perhaps ask Linus to take them *after* -rc1? Since they're actually
    bug fixes, I suspect that's the best way to proceed?

    --
    dwmw2



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