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[Launchpad Bug Tracker <1541120@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-4.19

---------------
linux (4.4.0-4.19) xenial; urgency=low

  * update ZFS and SPL to 0.6.5.4 (LP: #1542296)
    - [Config] update spl/zfs version
    - SAUCE: (noup) Update spl to 0.6.5.4-0ubuntu2, zfs to 0.6.5.4-0ubuntu1
    - [Config] reconstruct -- drop links for zfs userspace components
    - [Config] reconstruct -- drop links for zfs userspace components -- restore spec links

  * recvmsg() fails SCM_CREDENTIALS request with EOPNOTSUPP. (LP: #1540731)
    - Revert "af_unix: Revert 'lock_interruptible' in stream receive code"

  * lxc: ADT exercise test failing with linux-4.4.0-3.17  (LP: #1542049)
    - Revert "UBUNTU: SAUCE: apparmor: fix sleep from invalid context"

  * WARNING: at /build/linux-lts-wily-W0lTWH/linux-lts-wily-4.2.0/net/core/skbuff.c:4174 (Travis IB) (LP: #1541326)
    - SAUCE: IB/IPoIB: Do not set skb truesize since using one linearskb

  * backport Microsoft Precision Touchpad palm rejection patch (LP: #1541671)
    - HID: multitouch: enable palm rejection if device implements confidence usage

  * [Ubuntu 16.04] Update qla2xxx driver for POWER (QLogic) (LP: #1541456)
    - qla2xxx: Remove unavailable firmware files
    - qla2xxx: Enable Extended Logins support
    - qla2xxx: Enable Exchange offload support.
    - qla2xxx: Enable Target counters in DebugFS.
    - qla2xxx: Add FW resource count in DebugFS.
    - qla2xxx: Added interface to send explicit LOGO.
    - qla2xxx: Delete session if initiator is gone from FW
    - qla2xxx: Wait for all conflicts before ack'ing PLOGI
    - qla2xxx: Replace QLA_TGT_STATE_ABORTED with a bit.
    - qla2xxx: Remove dependency on hardware_lock to reduce lock contention.
    - qla2xxx: Add irq affinity notification
    - qla2xxx: Add selective command queuing
    - qla2xxx: Move atioq to a different lock to reduce lock contention
    - qla2xxx: Disable ZIO at start time.
    - qla2xxx: Set all queues to 4k
    - qla2xxx: Check for online flag instead of active reset when transmitting responses
    - scsi: qla2xxxx: avoid type mismatch in comparison

  * [Hyper-V] PCI Passthrough (LP: #1541120)
    - x86/irq: Export functions to allow MSI domains in modules
    - genirq/msi: Export functions to allow MSI domains in modules

  * Update lpfc driver to 11.0.0.10 (LP: #1541592)
    - lpfc: Fix FCF Infinite loop in lpfc_sli4_fcf_rr_next_index_get.
    - lpfc: Fix the FLOGI discovery logic to comply with T11 standards
    - lpfc: Fix RegLogin failed error seen on Lancer FC during port bounce
    - lpfc: Fix driver crash when module parameter lpfc_fcp_io_channel set to 16
    - lpfc: Fix crash in fcp command completion path.
    - lpfc: Modularize and cleanup FDMI code in driver
    - lpfc: Fix RDP Speed reporting.
    - lpfc: Fix RDP ACC being too long.
    - lpfc: Make write check error processing more resilient
    - lpfc: Use new FDMI speed definitions for 10G, 25G and 40G FCoE.
    - lpfc: Fix mbox reuse in PLOGI completion
    - lpfc: Fix external loopback failure.
    - lpfc: Add logging for misconfigured optics.
    - lpfc: Delete unnecessary checks before the function call "mempool_destroy"
    - lpfc: Use kzalloc instead of kmalloc
    - lpfc: Update version to 11.0.0.10 for upstream patch set

  * Miscellaneous Ubuntu changes
    - [Config] CONFIG_ARM64_VA_BITS=48
    - [Config] Fixed Vcs-Git

  * Miscellaneous upstream changes
    - cxl: Fix possible idr warning when contexts are released
    - cxl: use correct operator when writing pcie config space values
    - cxlflash: drop unlikely before IS_ERR_OR_NULL
    - cxl: Fix DSI misses when the context owning task exits
    - cxlflash: Removed driver date print
    - cxlflash: Fix to resolve cmd leak after host reset
    - cxlflash: Resolve oops in wait_port_offline
    - cxlflash: Enable device id for future IBM CXL adapter
    - cxl: fix build for GCC 4.6.x
    - cxl: use -Werror only with CONFIG_PPC_WERROR
    - cxl: Enable PCI device ID for future IBM CXL adapter

 -- Andy Whitcroft <apw@xxxxxxxxxxxxx>  Fri, 05 Feb 2016 14:58:51 +0000

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

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https://bugs.launchpad.net/bugs/1541120

Title:
  [Hyper-V] PCI Passthrough prerequisites

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  Jake Oshins (Microsoft) has submitted upstream the PCI Passthrough
  feature, and while it is not yet accepted upstream (because of the
  effect on multiple trees and affects PCI), Microsoft would like
  Canonical to consider its inclusion in Ubuntu 16.04 and beyond. The
  rounds of feedback on the patches are winding down, so it is a good
  time to consider them.

  All of the submitted files are in the attached thread, but not all are
  committed to Linus's tree as of 4.5-rc1.

  This feature is needed for supporting SR-IOV and GPU passthrough on
  Hyper-V.

  The 10th iteration of the upstream submission is available on lkml:

  https://lkml.org/lkml/2015/12/10/553

  From	jakeo@microsof ...
  Subject	[PATCH v10 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs
  Date	Thu, 10 Dec 2015 17:52:56 +0000
  From: Jake Oshins <jakeo@xxxxxxxxxxxxx>

  This version of the patch series removes warning when compiling x86
  32-bit while still making it build cleanly for x64.

  First, export functions that allow correlating Hyper-V virtual processors
  and Linux cpus, along with the means for invoking a hypercall that targets
  interrupts at chosen vectors on specific cpus.

  Second, mark various parts of IRQ domain related code as exported, so that
  this PCI front-end can implement an IRQ domain as part of a module. (The
  alternative would be to pull all tyhis into the kernel, which would pull
  in a lot of other Hyper-V related code, as this IRQ domain depends on
  vmbus.ko.)

  Third, modify PCI so that new root PCI buses can be marked with an associated
  fwnode_handle, and so that root PCI buses can look up their associated IRQ
  domain by that handle.

  Fourth, introduce a new driver, hv_pcifront, which exposes root PCI buses in
  a Hyper-V VM. These root PCI buses expose real PCIe device, or PCI Virtual
  Functions.

  Jake Oshins (7):
    drivers:hv: Export a function that maps Linux CPU num onto Hyper-V
      proc num
    drivers:hv: Export hv_do_hypercall()
    PCI: Make it possible to implement a PCI MSI IRQ Domain in a module.
    PCI: Add fwnode_handle to pci_sysdata
    PCI: irqdomain: Look up IRQ domain by fwnode_handle
    drivers:hv: Define the channel type of Hyper-V PCI Express
      pass-through
    PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

   MAINTAINERS | 1 +
   arch/x86/include/asm/msi.h | 6 +
   arch/x86/include/asm/pci.h | 15 +
   arch/x86/kernel/apic/msi.c | 8 +-
   arch/x86/kernel/apic/vector.c | 2 +
   drivers/hv/hv.c | 20 +-
   drivers/hv/hyperv_vmbus.h | 2 +-
   drivers/hv/vmbus_drv.c | 17 +
   drivers/pci/Kconfig | 7 +
   drivers/pci/host/Makefile | 1 +
   drivers/pci/host/hv_pcifront.c | 2249 ++++++++++++++++++++++++++++++++++++++++
   drivers/pci/msi.c | 4 +
   drivers/pci/probe.c | 15 +
   include/linux/hyperv.h | 14 +
   include/linux/pci.h | 4 +
   kernel/irq/chip.c | 1 +
   kernel/irq/irqdomain.c | 4 +
   17 files changed, 2356 insertions(+), 14 deletions(-)
   create mode 100644 drivers/pci/host/hv_pcifront.c

  Accepted commits so far in 4.5-rc1:

  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a108393dbf764efb2405f21ca759806c65b8bc16 drivers:hv: Export the API to invoke a hypercall on Hyper-V
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=619848bd074343ff2bdeeafca0be39748f6da372 drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3053c762444a83ec6a8777f9476668b23b8ab180 drivers:hv: Define the channel type for Hyper-V PCI Express pass-through
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=40f26f3168bf7a4da490db308dc0bd9f9923f41f drivers:hv: Allow for MMIO claims that span ACPI _CRS records
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a4289dc2ec3a5821076a78ee9678909b4eff297e genirq/msi: Export functions to allow MSI domains in modules
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c8f3e518d3444ee9200a4987421fcee60f768f11 x86/irq: Export functions to allow MSI domains in modules

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