I had some more time to work on this problem. After more research and reading more information I discovered that IOMMU was not enabled on my system. To enable IOMMU I performed the following steps on my Ubuntu Linux server:
sudo vi /etc/default/grub Add “intel_iommu=on” to the GRUB_CMDLINE_LINUX variable :wq sudo update-grub Reboot the system. The results of these commands is adding intel_iommu=on as a boot parameter to the grub Linux boot commands. After performing those steps I was able to get much more information in the command: bruzer@apocalypse:~$ dmesg | grep -e DMAR -e IOMMU [ 0.000000] ACPI: DMAR 00000000bc843878 000B8 (v01 INTEL HSW 00000001 INTL 00000001) [ 0.000000] Intel-IOMMU: enabled [ 0.020485] dmar: IOMMU 0: reg_base_addr fed90000 ver 1:0 cap c0000020660462 ecap f0101a [ 0.020489] dmar: IOMMU 1: reg_base_addr fed91000 ver 1:0 cap d2008020660462 ecap f010da [ 0.020556] IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1 [ 0.394459] DMAR: No ATSR found [ 0.394479] IOMMU 0 0xfed90000: using Queued invalidation [ 0.394480] IOMMU 1 0xfed91000: using Queued invalidation [ 0.394481] IOMMU: Setting RMRR: [ 0.394489] IOMMU: Setting identity map for device 0000:00:02.0 [0xbf800000 - 0xcf9fffff] [ 0.395687] IOMMU: Setting identity map for device 0000:00:1d.0 [0xbc6fa000 - 0xbc706fff] [ 0.395708] IOMMU: Setting identity map for device 0000:00:1a.0 [0xbc6fa000 - 0xbc706fff] [ 0.395726] IOMMU: Setting identity map for device 0000:00:14.0 [0xbc6fa000 - 0xbc706fff] [ 0.395740] IOMMU: Prepare 0-16MiB unity mapping for LPC [ 0.395745] IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 – 0xffffff] Now I am able to successfully run the commands that unbind and bind to the pci-stub module. # echo "10de 11c0" > /sys/bus/pci/drivers/pci-stub/new_id # echo "0000:01:00.0" > /sys/bus/pci/devices/0000\:01\:00.0/driver/unbind # echo "0000:01:00.0" > /sys/bus/pci/drivers/pci-stub/bind These commands have no problems now that I am using the additional boot parameter. I believe we can close this bug report because there does not seem to be a problem with the unbind command. The PCI passthrough of the video card is still not working, but I do not believe that is related to anything in this bug report. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1190120 Title: Unbind not working as expected Status in “linux” package in Ubuntu: Confirmed Bug description: I am trying to unbind a PCI device I received a kernel Oops. I was following instructions described in this KVM document: http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM When I get to the unbind step: echo 0000:01:00.0 > /sys/bus/pci/devices/0000:01:00.0/driver/unbind In Raring I got a kernel Oops. Please note at this point I am not running the kvm guest, just trying to unbind the PCI device. I do have VT-d enabled in the bios and a processor that supports IOMMU. This problem is repeatable and appears to be isolated to the unbind command. However, in Saucy, I do not get a kernel oops, but executing unbind as root puts back into non-root user account. After going back as root, I am not able to perform the next step to bind the device. root@ubuntu:/home/ubuntu# echo 0000:01:00.0 > /sys/bus/pci/drivers/pci-stub/bind bash: echo: write error: No such device ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image-3.8.0-23-generic 3.8.0-23.34 ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11 Uname: Linux 3.8.0-23-generic x86_64 ApportVersion: 2.9.2-0ubuntu8.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: bruzer 2169 F.... pulseaudio /dev/snd/controlC1: bruzer 2169 F.... pulseaudio CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. Date: Tue Jun 11 21:43:14 2013 HibernationDevice: RESUME=UUID=4b6b5242-2b8c-46e6-9d91-3168bcee1249 InstallationDate: Installed on 2013-06-07 (4 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) IwConfig: eth0 no wireless extensions. lo no wireless extensions. virbr0 no wireless extensions. MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb 1 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-23-generic root=UUID=3ee858ac-5064-4c88-b187-2629fedf6f9c ro intel_iommu=on quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-23-generic N/A linux-backports-modules-3.8.0-23-generic N/A linux-firmware 1.106 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/03/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P1.20 dmi.board.name: Z87M Extreme4 dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.20:bd05/03/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ87MExtreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. --- ApportVersion: 2.12.1-0ubuntu3 Architecture: amd64 CasperVersion: 1.336 DistroRelease: Ubuntu 13.10 IwConfig: eth0 no wireless extensions. lo no wireless extensions. LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130904) MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. MarkForUpload: True Package: linux (not installed) ProcFB: 1 inteldrmfb ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Daemon not responding. RelatedPackageVersions: linux-restricted-modules-3.11.0-4-generic N/A linux-backports-modules-3.11.0-4-generic N/A linux-firmware 1.113 RfKill: Tags: saucy Uname: Linux 3.11.0-4-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: dmi.bios.date: 07/05/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P1.60 dmi.board.name: Z87M Extreme4 dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.60:bd07/05/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ87MExtreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. 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