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    SubjectRe: [PATCH] x86-64: disable the GART before allocate aperture
    Eric W. Biederman wrote:
    > The original design came from thinking about systems where using the iommu
    > was mandatory. I think we almost always reserve memory below 1G for the kexec
    > on panic kernel so it really shouldn't be an issue in that case. Except
    > we need to pass an option to force not using the iommu. I don't think
    > noiommu or swiotlb is going to make any real difference.
    > So I'm totally in favor of turning off features if we don't need them and we
    > don't take a tremendous performance hit. (People get grumpy when writing
    > all of memory to disk takes completely unreasonable amounts of time).

    So you prefer to
    add diable_gart in shutdown or suspend func and let kexec to use swiotlb comand line?

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