This patch was applied on top of the patch series to implement smmu pass though 
on zesty kernel and tested on Dell PowerEdge T710 and it fixes the regression. 
ubuntu@adib:~$ uname -a 
Linux adib 4.10.0-21-generic #23~sru4.test5 SMP Tue May 30 18:25:49 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux
ubuntu@adib:~$

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https://bugs.launchpad.net/bugs/1688158

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

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]
  Have the SMMU come up in a passthrough configuration, and then allow 
subsequent translation for things such as VFIO. Rather than do this in each 
SMMU driver, it's much cleaner to allow the default domain to be configured to 
be something other than DMA.

  This patch series implements a command-line option to configure the
  default domain type. Currently, it supports "dma" and "identity" which
  is sufficient for the passthrough use-case.

  [Fix]
  The following patch series in linux-next adds this support to the kernel.
  4a8d8a14c0d0 arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA
  fccb4e3b8ab0 iommu: Allow default domain type to be set on the kernel command 
line
  beb3c6a066bf iommu/arm-smmu-v3: Install bypass STEs for IOMMU_DOMAIN_IDENTITY 
domains
  67560edcd8e5 iommu/arm-smmu-v3: Make arm_smmu_install_ste_for_dev return void
  61bc671179f1 iommu/arm-smmu: Install bypass S2CRs for IOMMU_DOMAIN_IDENTITY 
domains
  0834cc28fa56 iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains

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