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USB pass through in QEMU command line for ARM machines

Srinuvasan

Hi All,

        I want boot the QEMU ARM machine with USB emulation, initially i launched the QEMU ARM machine but i cant able to see the usb devices using lsusb command.

       so thought to pass the Host USB to QEMU for that i passed the below configuration to QEMU command line 
        -usb -device usb-host, vendorid<xxxxx>, productid<xxxxx>
       then when i launch the QEMU am facing the below problem
       "No usb bus found for usb-devices".
      How to identify the bus for usb-host to pass through.
      Any help would be appreciated.
Thanks,
Srinuvasan.A
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  • 0 in reply to Jerome Decamps - 杜尚杰

    Hi, 

             Thanks for the reference, Only ARM i can able to see the "No usb bus found for usb-devices" error  when we pass through the USB to QEMU.

    the same  " -usb -device usb-host, vendorid<xxxxx>, productid<xxxxx>" command working fine for QEMU amd64 machines, here am not facing any bus issue

    Any idea?

    And one more thing when we boot QEMU amd64 i can able to see the USB controller register information

    [ 0.828829] sky2: driver version 1.30
    [ 0.829216] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
    [ 0.829743] ehci-pci: EHCI PCI platform driver
    [ 0.830536] ehci-pci 0000:00:1d.7: EHCI Host Controller
    [ 0.830997] ehci-pci 0000:00:1d.7: new USB bus registered, assigned bus number 1
    [ 0.831700] ehci-pci 0000:00:1d.7: irq 19, io mem 0xfebd2000
    [ 0.838488] ehci-pci 0000:00:1d.7: USB 2.0 started, EHCI 1.00
    [ 0.838958] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.19
    [ 0.839616] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
    [ 0.840175] usb usb1: Product: EHCI Host Controller
    [ 0.840600] usb usb1: Manufacturer: Linux 4.19.124-cip27 ehci_hcd
    [ 0.841071] usb usb1: SerialNumber: 0000:00:1d.7

    But when we boot QEMU ARM am not able to see the USB controller registration


    [ 1.747101] CAN device driver interface
    [ 1.750460] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
    [ 1.750689] ehci-pci: EHCI PCI platform driver
    [ 1.751014] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
    [ 1.751235] ohci-pci: OHCI PCI platform driver
    [ 1.751493] uhci_hcd: USB Universal Host Controller Interface driver
    [ 1.751859] usbcore: registered new interface driver usblp
    [ 1.752131] usbcore: registered new interface driver usb-storage
    [ 1.753986] mousedev: PS/2 mouse device common for all mice
    [ 1.754694] i2c /dev entries driver
    [ 1.757415] device-mapper: ioctl: 4.39.0-ioctl (2018-04-03) initialised: dm-devel@redhat.com
    [ 1.758167] Synopsys Designware Multimedia Card Interface Driver

    Please provide your thoughts if any?

    Thnaks,

    Srinuvasan.A