This is fixed in upstream by patch, will cherry-pick this patch and test
on intel system to fix this regression, and resubmit the sru.
commit 0ef7b235aeddf9b2f78889c7823a24745ebf0cf7
Author: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Date: Wed Feb 15 16:42:21 2017 +0200
iommu/vt-d: Fix crash on boot when DMAR is disabled
By default CONFIG_INTEL_IOMMU_DEFAULT_ON is not set and thus
dmar_disabled variable is set.
Intel IOMMU driver based on above doesn't set intel_iommu_enabled
variable.
The commit b0119e870837 ("iommu: Introduce new 'struct iommu_device'")
mistakenly assumes it never happens and tries to unregister not ever
registered resources, which crashes the kernel at boot time:
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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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