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[Launchpad Bug Tracker <1715489@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux-azure - 4.11.0-1009.9

---------------
linux-azure (4.11.0-1009.9) xenial; urgency=low

  * linux-azure: 4.11.0-1009.9 -proposed tracker (LP: #1715731)

  * [Hyper-V] Read TSC frequency from a synthetic MSR  (LP: #1715489)
    - x86/hyperv: Check frequency MSRs presence according to the specification
    - x86/hyperv: Read TSC frequency from a synthetic MSR

  * [Hyper-V] linux-azure: rdma_ucm should autoload on HPC images (LP: #1712915)
    - azure: force rdma_ucm to be loaded when hv_network_direct_* is loaded

 -- Marcelo Henrique Cerri <marcelo.cerri@xxxxxxxxxxxxx>  Thu, 07 Sep
2017 16:28:39 -0300

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

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https://bugs.launchpad.net/bugs/1715489

Title:
  [Hyper-V] Read TSC frequency from a synthetic MSR

Status in linux package in Ubuntu:
  Confirmed
Status in linux-azure package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Confirmed
Status in linux-azure source package in Xenial:
  Fix Released

Bug description:
  It was found that SMI_TRESHOLD of 50000 is not enough for Hyper-V
  guests in nested environment and falling back to counting jiffies
  is not an option for Gen2 guests as they don't have PIT. As Hyper-V
  provides TSC frequency in a synthetic MSR we can just use this information
  instead of doing a error prone calibration.

  Upstream commit here:
  https://github.com/torvalds/linux/commit/71c2a2d0a81f096a2932fccb39a500116fece554

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