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    SubjectRe: [PATCH 0/2]Add Variable Page Size and IA64 Support in Intel IOMMU
    On Wednesday 01 October 2008 10:56:06 am Fenghua Yu wrote:
    > The following two patches (Intel IOMMU generic patch and ia64 specific patch) together enable Intel IOMMU on IA64 platform. They are applied cleanly on the latest linux-next tree which contains Intel IOMMU interrupt remapping and VT-d driver KVM support code.

    General comment (not ia64-related): it looks like you detect the
    IOMMU using the static DMAR table. Does the IOMMU also appear in
    PCI config space or the ACPI namespace? I expect it would, because
    the fact that the DMAR table is static precludes any sort of hot-plug
    to add or remove IOMMUs.

    If it *is* in config space or the namespace, it would be good to
    exercise that discovery path to help shake out firmware bugs. For
    example, arch/ia64/hp/common/sba_iommu.c uses acpi_bus_register_driver()
    to discover HP IOMMUs. I wouldn't hold the sba_iommu.c discovery code
    (most of which I take the blame for) up as a shining example of how to
    do things, but it shows the point.


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