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    SubjectRe: [PATCH] iommu: Include MSI susceptibility to DMA in creating iommu groups
    On Thu, Nov 17, 2011 at 10:09:26AM -0700, Alex Williamson wrote:
    > IOMMU drivers should account for the platform's susceptibility to
    > DMA triggered MSI interrupts in creating IOMMU groups. Skip
    > devices when the IOMMU can't isolate MSI from DMA, but allow
    > an iommu=group_unsafe_msi option for opt-in. This removes the
    > leap in logic for users that IOMMU_CAP_INTR_REMAP is required for
    > interrupt security when they may be running on a non-x86 platform
    > that does not have this dependency.

    I actually don't see the point in this. The iommu-group thing is to tell
    user-space what devices the IOMMU can safely distinguish between. The
    absence of interrupt-remapping changes nothing to that grouping. So why
    remove it when interrupt remapping is not enabled?


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