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[Launchpad Bug Tracker <1671760@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xen - 4.8.0-1ubuntu2

---------------
xen (4.8.0-1ubuntu2) zesty; urgency=medium

  * Cherry-pick upstream change to fix TSC_ADJUST MSR handling in HVM
    guests running on Intel based hosts (LP: #1671760)

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Tue, 14 Mar 2017 09:27:04
+0100

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

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https://bugs.launchpad.net/bugs/1671760

Title:
  Xen HVM guests running linux 4.10 fail to boot on Intel hosts

Status in linux package in Ubuntu:
  Won't Fix
Status in xen package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Invalid
Status in xen source package in Trusty:
  Fix Committed
Status in linux source package in Xenial:
  Invalid
Status in xen source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Invalid
Status in xen source package in Yakkety:
  Fix Committed
Status in linux source package in Zesty:
  Won't Fix
Status in xen source package in Zesty:
  Fix Released

Bug description:
  Starting with Linux kernel 4.10, the kernel does some sanity checking
  on the TSC_ADJUST MSR. Xen has implemented some support for that MSR
  in the hypervisor (Xen 4.3 and later) for HVM guests. But boot and
  secondary vCPUs are set up inconsistently. This causes the boot of a
  4.10 HVM guest to hang early on boot.

  This was fixed in the hypervisor by:

    commit 98297f09bd07bb63407909aae1d309d8adeb572e
    x86/hvm: do not set msr_tsc_adjust on hvm_set_guest_tsc_fixed

  That fix would be contained in 4.6.5 and 4.7.2 and would be in 4.8.1
  (not released, yet) which mean that Ubuntu 14.04/16.04/16.10 and 17.04
  currently are affected.

  ---

  SRU Justification:

  Impact: Without the TSC_ADJUST MSR fix, 4.10 and later kernels will
  get stuck at boot when running as (PV)HVM guests on Xen 4.3 and later.

  Fix: Above fix either individually applied or as part of Xen stable
  stream (for Xen 4.7.x and 4.6.x) resolves the issue.

  Testcase:
  - Requires Intel based host which supports the TSC_ADJUST MSR
  - Configured as Xen host
  - HVM guest running Zesty/17.04
  - Stuck at boot before, normal booting OS after

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