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[Bug 1724992] Re: [Hyper-V] PCI passthrough no longer works on 4.4.0-97

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>
Date: Fri, 20 Oct 2017 16:24:15 -0000
Reply-to: Bug 1724992 <1724992@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Do you know what 4.4 based kernel PCI passthrough used to work on ?

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: kernel-da-key kernel-hyper-v xenial

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1724992

Title:
  [Hyper-V] PCI passthrough no longer works on 4.4.0-97

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Confirmed

Bug description:
  Azure NV class:

  4.11.0-1013:
  jrp@jrpubuntuv:~$ lspci
  0000:00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (AGP disabled) (rev 03)
  0000:00:07.0 ISA bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 01)
  0000:00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
  0000:00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
  0000:00:08.0 VGA compatible controller: Microsoft Corporation Hyper-V virtual VGA
  983b:00:00.0 VGA compatible controller: NVIDIA Corporation GM204GL [Tesla M60] (rev a1) 

  4.11 finds it fine, but NVIDIA's GRID driver doesn't support newer
  kernels like 4.11.

  4.4.0-97:
  jrp@jrpubuntuv:~$ uname -r
  4.4.0-97-generic
  jrp@jrpubuntuv:~$ lspci
  00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (AGP disabled) (rev 03)
  00:07.0 ISA bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 01)
  00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
  00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
  00:08.0 VGA compatible controller: Microsoft Corporation Hyper-V virtual VGA 

  4.4.0-77, 79, 83, 87, 89, 91, 92, 93, and 96 also fail to find the
  hardware.

  These used to work, so I am also investigating on the host/hardware
  side.

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