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    SubjectRe: [PATCH 1/2] mm: move force_dma_unencrypted() to mem_encrypt.h
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    On 20.02.20 17:31, Christoph Hellwig wrote:
    > On Thu, Feb 20, 2020 at 05:23:20PM +0100, Christian Borntraeger wrote:
    >> >From a users perspective it makes absolutely perfect sense to use the
    >> bounce buffers when they are NEEDED.
    >> Forcing the user to specify iommu_platform just because you need bounce buffers
    >> really feels wrong. And obviously we have a severe performance issue
    >> because of the indirections.
    >
    > The point is that the user should not have to specify iommu_platform.

    I (and Halil) agree on that. From a user perspective we want to
    have the right thing in the guest without any command option. The iommu_plaform
    thing was indeed a first step to make things work.

    I might mis-read Halils patch, but isnt one effect of this patch set
    that things WILL work without iommu_platform?


    > We need to make sure any new hypervisor (especially one that might require
    > bounce buffering) always sets it, as was a rather bogus legacy hack
    > that isn't extensibe for cases that for example require bounce buffering.

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