NAK Re: [SRU][Zesty] Support SMMU passthrough using the default domain

Paolo Pisati paolo.pisati at
Thu May 18 09:24:35 UTC 2017

On Tue, May 16, 2017 at 10:11 PM, Manoj Iyer <manoj.iyer at> wrote:
> This patch series adds support for SMMU passthrough using the default domain,
> the patch series implements a kernel command-line option iommu.passthrough=0/1
> 1 - Bypass the IOMMU for DMA, 0 - Use IOMMU translation for DMA. This feature
> is desired on both Qualcomm Centriq 2400 and Thunder-X platforms.
> The bug report has detailed test results
> from Qualcomm demonstrating performance improvements using passthrough. I have
> also tested the kernel on Thundex-X for any regressions, for both boot test and
> pci passthrough.
> Please review and consider for SRU.

Doesn't build.

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