This bug was fixed in the package linux - 4.10.0-13.15

---------------
linux (4.10.0-13.15) zesty; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1671614

  * ehci-platform needed in usb-modules udeb (LP: #1671589)
    - d-i: add ehci-platform to usb-modules

  * irqchip/gic-v3-its: Enable cacheable attribute Read-allocate hints
    (LP: #1671598)
    - irqchip/gic-v3-its: Enable cacheable attribute Read-allocate hints

  * iommu: Fix static checker warning in iommu_insert_device_resv_regions
    (LP: #1671599)
    - iommu: Fix static checker warning in iommu_insert_device_resv_regions

  * QDF2400: Fix panic introduced by erratum 1003 (LP: #1671602)
    - arm64: Avoid clobbering mm in erratum workaround on QDF2400

  * QDF2400 PCI ports require ACS quirk (LP: #1671601)
    - PCI: Add ACS quirk for Qualcomm QDF2400 and QDF2432

  * tty: pl011: Work around QDF2400 E44 stuck BUSY bit (LP: #1671600)
    - tty: pl011: Work around QDF2400 E44 stuck BUSY bit

  * CVE-2017-2636
    - tty: n_hdlc: get rid of racy n_hdlc.tbuf

  * Sync virtualbox to 5.1.16-dfsg-1 in zesty (LP: #1671470)
    - ubuntu: vbox -- Update to 5.1.16-dfsg-1

 -- Tim Gardner <tim.gard...@canonical.com>  Thu, 09 Mar 2017 06:16:24
-0700

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2017-2636

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https://bugs.launchpad.net/bugs/1670726

Title:
  h-prod does not function across cores

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Yakkety:
  In Progress
Status in linux source package in Zesty:
  Fix Released

Bug description:
  There is a  performance problem issue with h-prod. I can see that
  h-prod calls are only waking hardware threads from a h-cede call when
  the caller is on the same core as the thread being awoken (sibling
  theads).  For cross core prods the target thread remains in h-cede
  until its next decrementer interrupt.  That is causing guest OS some
  significant dispatching delays.

   The fix is now upstream as commit 8464c8842de2 ("KVM: PPC: Book3S HV:
  Fix H_PROD to actually wake the target vcpu", 2016-12-06) in
  v4.11-rc1.

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