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    SubjectRe: [PATCH 0/2] x86: per-device dma_mapping_ops
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    FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> writes:

    > This patchset adds per-device dma_mapping_ops support for
    > CONFIG_X86_64 like POWER architecture does. This change enables us to
    > cleanly fix the Calgary IOMMU issue that some devices are not behind
    > the IOMMU [1]. It also would be helpful to handle KVM PCI passthrough.

    This makes it basically impossible to do stack ops, which some
    people have been doing.

    -Andi


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