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madchaz
l33t
Joined: 01 Jul 2003
Posts: 995
Location: Quebec, Canada
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 Posted: Thu Aug 16, 2012 5:40 pm Post subject: qemu-kvm usb passthrought problem. |
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Good day.
First, I am not 100% sure this is where it should go, so moderators, feel free to scold me and move this to the appropriate forum if needed.
I have a bit of a usb problem with qemu-kvm.
I'm trying to get my arduino board to speak with a gentoo x86 virtual machine, but it's proving to be rather stuborn.
Connecting the board via USB and doing lsusb on the host.
| Code: |
host local.d # lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
Bus 005 Device 007: ID 2341:0042
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Bus 005 Device 007: ID 2341:0042 this gives me the ID to use to give qemu-kvm.
I start the virtual machine.
| Code: | qemu-kvm -smp 2 -name "dragonball1",process="dragonball1" -vnc 192.168.X.XX:5 -net nic,macaddr=00:00:00:00:00:06 -net vde -hda PATH_TO_DISK_IMAGE -m 512 -daemonize -usb -usbdevice host:2341:0042
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In the virtual machine, it shows up as /dev/ttyACM0 as it should and lsusb shows it properly, but I can't talk to it. Communication does not go from the VM to the board (it doesn't react to commands I send) and does not flow back (I get no output).
I've done this in virtualbox on my windows machine and it worked flawlessly, but I don't want virtualbox on my server. (Oracle ...)
I know the firmware on the board is good and should both take input and send output, so something isn't talking.
Any help would be appreciated.
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nativemad
Developer
Joined: 30 Aug 2004
Posts: 918
Location: Switzerland
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| Posted: Fri Aug 17, 2012 5:26 am Post subject: |
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Hi,
I've had similar problems with some usb modems that wouldn't work properly....
What worked for me is the pci paththrough of the whole usb port (via intel VT-D).
This is what I use to map the usb port:
| Code: |
echo 8086 3a36 >/sys/bus/pci/drivers/pci-stub/new_id
echo 0000:00:1d.2 >/sys/bus/pci/devices/0000\:00\:1d.2/driver/unbind
echo 0000:00:1d.2 >/sys/bus/pci/drivers/pci-stub/bind
qemu-kvm -device pci-assign,host=00:1d.2 $all_other_kvm_options |
See lspci -n for the numbers...
http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM
HTH, cheers
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madchaz
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Joined: 01 Jul 2003
Posts: 995
Location: Quebec, Canada
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| Posted: Fri Aug 17, 2012 2:22 pm Post subject: |
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Sounds interesting. I'm not on intel, unfortunatly. I'm on AMD. I'm guessing there is a similar procedure?
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madchaz
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Joined: 01 Jul 2003
Posts: 995
Location: Quebec, Canada
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| Posted: Fri Aug 17, 2012 2:30 pm Post subject: |
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I had a look at the page and I'm not convinced this will work for me. It requires hardware support I most likely do not have, not according to the wiki for AMD boards anyway.
I could use a litle more help making sure.
Motherboard is an Asus M4A87TD
CPU is a Phenom II x6 1090T
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Last edited by madchaz on Sat Aug 18, 2012 4:51 pm; edited 1 time in total |
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nativemad
Developer
Joined: 30 Aug 2004
Posts: 918
Location: Switzerland
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| Posted: Fri Aug 17, 2012 4:32 pm Post subject: |
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You'll probably see an option to enable iommu (maybe it is called something else about virtualization) within the bios.
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dmesg | grep AMD-Vi |
should tell you if it is enabled... or grep for IOMMU
HTH
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Circuitsoft
Tux's lil' helper
Joined: 14 Jul 2004
Posts: 112
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| Posted: Fri Aug 17, 2012 10:26 pm Post subject: |
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| madchaz wrote: | Motherboard is an Asus A8N-E.
CPU is a Phenom II x6 1090T |
How did you fit a Phenom II into a socket 939 motherboard? |
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madchaz
l33t
Joined: 01 Jul 2003
Posts: 995
Location: Quebec, Canada
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| Posted: Sat Aug 18, 2012 4:36 pm Post subject: |
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Edit: Because I fail at IT 101 and checked the wrong box. Dur. Corrected above
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madchaz
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Joined: 01 Jul 2003
Posts: 995
Location: Quebec, Canada
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| Posted: Sat Aug 18, 2012 4:52 pm Post subject: |
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| nativemad wrote: | You'll probably see an option to enable iommu (maybe it is called something else about virtualization) within the bios.
| Code: |
dmesg | grep AMD-Vi |
should tell you if it is enabled... or grep for IOMMU
HTH |
| Code: | dmesg | grep IOMMU
[ 0.000000] Please enable the IOMMU option in the BIOS setup
[ 0.602420] PCI-DMA: using GART IOMMU.
[ 0.602496] PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture
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Option isn't there in the bios, so going to have to check if I can find an update with the option.
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madchaz
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Posts: 995
Location: Quebec, Canada
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| Posted: Sat Aug 18, 2012 5:17 pm Post subject: |
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Updated to the latest bios from asus. Still don't have the option in the BIOS. Only option I have is "Secure Virtual Machine Mode" and that is turned on right now.
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madchaz
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Location: Quebec, Canada
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| Posted: Mon Aug 20, 2012 1:20 pm Post subject: |
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Did some more digging. Doesn't look like I'll be able to use direct PCI mapping with this board. Any other idea?
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madchaz
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Joined: 01 Jul 2003
Posts: 995
Location: Quebec, Canada
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| Posted: Mon Aug 20, 2012 2:24 pm Post subject: |
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Tried using virt-manager to connect the device to the VM. Everything works fine, just like before and I still can't talk to the board.
Starting to think I'll give up for now and install virtual-box for the one machine ...
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nativemad
Developer
Joined: 30 Aug 2004
Posts: 918
Location: Switzerland
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| Posted: Tue Aug 21, 2012 2:23 pm Post subject: |
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yeah, virtualbox might be better in regard of usb devices, as kvm seems to be refactoring these things and has some problems with it right now... https://bugs.gentoo.org/show_bug.cgi?id=428476
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