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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1567167

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1567167

Title:
  Ubuntu 15.10: tsc_offset is error for hot-plugged vcpu.

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  1. when hot plug vcpu, KVM will call kvm_write_tsc set the new vcpu's
  tsc_offset to host tsc.  The new vcpu's tsc_offsets is greatly
  different from preallocated vcpu's tsc_offset.

  2. For redhat 6.x, the vm will show warning and turn off TSC clock.
  kernel: CPU 1 got hotplugged
  kernel: kvm-clock: cpu 1, msr 0:282367c1, secondary cpu clock
  kernel: TSC synchronization [CPU#0 -> CPU#1]:
  kernel: Measured 150076598781 cycles TSC warp between CPUs, turning off TSC clock.
  kernel: Marking TSC unstable due to check_tsc_sync_source failed

  3. I think should set the new vcpu's tsc_offset to
  kvm->arch.cur_tsc_offset.

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