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[Bug 1385388] Re: iommu dmar pci passthrough regression


daemon dog, thank you for reporting this and helping make Ubuntu better.

At your earliest convenience, could you please test the latest upstream
kernel available from the very top line at the top of the page from
http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D (the release
names are irrelevant for testing, and please do not test the daily
folder)? Install instructions are available at
https://wiki.ubuntu.com/Kernel/MainlineBuilds . This will allow
additional upstream developers to examine the issue.

If testing on your main install would be inconvenient, one may:
1) Install Ubuntu to a different partition and then test this there.
2) Backup, or clone the primary install.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:

Where X, and Y are the first two numbers of the kernel version, and Z is
the release candidate number if it exists.

If the mainline kernel does not fix the issue, please add the following tags:

Please note, an error to install the kernel does not fit the criteria of

Once testing of the latest upstream kernel is complete, please mark this
report's Status as Confirmed. Please let us know your results.

Thank you for your understanding.

** Tags added: latest-bios-f9

** Package changed: linux-lts-trusty (Ubuntu) => linux (Ubuntu)

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

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

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  iommu dmar pci passthrough regression

Status in linux package in Ubuntu:

Bug description:
  I'd like to reduce clutter and get the most use out of my existing
  infrastructure so I wanted to stop using an external VOIP gateway for
  my PSTN lines and use a dedicated card with Asterisk instead via VT-d
  and the iommu under Virtualbox 4.1.34. The hardware I have is capable
  and the relevant BIOS and kernel options are enabled. I have set
  intel_iommu=on and I have also tried using the additional kernel
  option iommu=pt.

  After testing I can confirm that this works correctly using linux
  3.2.0-70-generic but not with 3.5.0-54-generic, 3.13.0-37-generic or
  3.16.6-031606-generic (from mainline kernel-ppa). I noted that there
  may be a possible solution in
  https://bugzilla.kernel.org/show_bug.cgi?id=44881#c49 but that this
  would not be backported.

  Release: Ubuntu 12.04.5 LTS
  Linux 3.13.0-37-generic #64~precise1-Ubuntu SMP Wed Sep 24 21:37:11 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  Motherboard: Gigabyte Technology Co., Ltd. Z87X-D3H/Z87X-D3H-CF, BIOS F9 08/25/2014

  The card I'd like to pass to the guest...

  03:00.0 Ethernet controller: Digium, Inc. Wildcard TDM410 4-port
  analog card (rev 11)

  I have setup pci-stub with the above and set vboxpci to softdep on it. Not sure if that's necessary or not as there are no host drivers available.
  The error I'm seeing when loading the kernel module in the guest (except when using kernel 3.2 which works properly). Modprobe hangs in the guest and eventually causes the guest to freeze.

  Oct 24 09:05:08 kernel: [   81.496003] dmar: DRHD: handling fault status reg 3
  Oct 24 09:05:08 kernel: [   81.496032] dmar: DMAR:[DMA Read] Request device [03:00.0] fault addr 7349c000
  Oct 24 09:05:08 kernel: [   81.496032] DMAR:[fault reason 06] PTE Read access is not set

  Another error which may be related...

  WARNING: CPU: 4 PID: 1 at /build/buildd/linux-lts-

  If there is any possibility of trying the patch mentioned in bugzilla
  with the current kernel that would be great. I'm going to look and see
  if there is a later kernel available to try as I'm not sure if 3.16.6
  has it or not.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-37-generic 3.13.0-37.64~precise1
  ProcVersionSignature: Ubuntu 3.13.0-37.64~precise1-generic
  Uname: Linux 3.13.0-37-generic x86_64
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
  MachineType: Gigabyte Technology Co., Ltd. Z87X-D3H
  MarkForUpload: True
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic root=UUID=c3169056-4938-4faf-b6eb-d70b4268b135 ro intel_iommu=on iommu=pt
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.79.18
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/25/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F9
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z87X-D3H-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF9:bd08/25/2014:svnGigabyteTechnologyCo.,Ltd.:pnZ87X-D3H:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ87X-D3H-CF:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: Z87X-D3H
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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