This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verification-needed-bionic' to 'verification-failed-
bionic'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-bionic

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https://bugs.launchpad.net/bugs/1785282

Title:
  arm-smmu-v3 arm-smmu-v3.1.auto: failed to allocate MSIs

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  ARM systems w/ an SMMUv3 that uses MSI control interrupts fail to initialize 
them, which can e.g. prevent detected device errors from being reported.

  [Test Case]
  dmesg | grep "failed to allocate MSIs"
  grep arm-smmu-v3 /proc/interrupts

  [Fix]
  Upstream fixes that add support for the SMMUv3 device ID mapping index - 
which is required for MSI support - need to be included.

  [Regression Risk]
  By enabling these interrupts, we're allowing code to run that previously 
didn't, which could potentially do bad things. However, the interrupt handlers 
look pretty simple/straightforward, and I haven't seen any problems on a system 
that uses them w/ the fixes applied.

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