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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** No longer affects: linux (Ubuntu Artful)

** Tags removed: artful

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https://bugs.launchpad.net/bugs/1729442

Title:
  Prevent timer value 0 for MWAITX

Status in amd:
  New
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Zesty:
  In Progress

Bug description:
  Newer hardware has uncovered a bug in the software implementation of
  using MWAITX for the delay function. A value of 0 for the timer is
  meant to indicate that a timeout will not be used to exit MWAITX. On
  newer hardware this can result in MWAITX never returning, resulting in
  NMI soft lockup messages being printed. On older hardware, some of the
  other conditions under which MWAITX can exit masked this issue.

  The AMD APM does not currently document this and will be updated.
  Please refer to http://marc.info/?l=kvm&m=148950623231140 for
  information regarding NMI soft lockup messages on an AMD Ryzen 1800X.
  This has been root-caused as a 0 passed to MWAITX causing it to wait
  indefinitely. This change has the added benefit of avoiding the
  unnecessary setup of MONITORX/MWAITX when the delay value is zero.

  
  https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=88d879d29f9cc0de2d930b584285638cdada6625

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