group.of.nepali.translators team mailing list archive

[Frank Heimes <1703663@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Fix Committed => Fix Released

** Changed in: ubuntu-power-systems
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1703663

Title:
  ISST-LTE: Briggs:Stratton:UbuntuKVM:  ics_opal_set_affinity on host
  kernel log using Intel X710 (i40e driver)

Status in The Ubuntu-power-systems project:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  SRU Justification:

  Impact:
  We have an issue with the i40e driver, present in kernels pre-4.8, like Xenial v4.4 (from Ubuntu 16.04.1).

  i40e driver has an issue in interrupt vector assignment in case of
  sparse CPU masks, like when some CPUs are disabled. The driver does a
  linear mapping not taking gaps on cpumask into account. This is a
  problem in systems with multiple logical CPUs per core (like in SMT
  scenarios).

  If we disable some logical CPUs, by turning SMT off for example, we
  will end up with a sparse cpu_online_mask, i.e., only the first CPU in
  a core is online, and the incremental/linear filling in the interrupt
  cpumask might lead to multiple offline CPUs being assigned to the
  struct q_vector in the driver, leading to issues when interrupts are
  requested, like the following message in PowerPC systems:

  [141.97] ics_opal_set_affinity: No online cpus in the mask
  00200000,00000000,00000000,00000000 for irq 302

  This message is output of interrupt controller in Power systems, a
  complain that the cpumask does not make sense to that particular
  system.

  Fix: Cherry-picking 7f6c553902bfa1c4e3f6cfa955c5ea036c7fe8e4
    i40e: use valid online CPU on q_vector initialization
  into Xenial. Change limited to specific driver. Regression potential should be low and results testable.

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