When we are virtualizing, either VirtualBox or KVM, one of the problems that we encountered is that

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When we are virtualizing, either VirtualBox or KVM, one of the problems that we encountered is that sometimes the devices that connect to the Host (PC Physics), can not be displayed in the Client (Virtual PC).
VirtualBox has a plugin for USB sticks, and in the case of KVM should not be a problem seeing these devices because it uses directly the kernel you have installed. Devices but not always, as in the example discussed below, where a user needed to connect your USB GSM Modem is.
1-Connect the modem to the PC and run a command to find some data: $ 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: 0001 Linux Foundation 1.1 root hub Bus 004 Device 002: ID 0557: 2221 ATEN International Co., Ltd Winbond Hermon libra Bus 002 Device 003: ID 12d1: 1003 Huawei Technologies Co., Ltd. E220 HSDPA Modem / E230 / E270 / E870 HSDPA / HSUPA Modem
When you run the same command on the client, as you can see, you do not get the same result: $ lsusb Bus 001 Device 001: ID 1d6b: 0001 Linux Foundation 1.1 root hub Bus 001 Device 002: ID 0627: 0001 Adomax Technology Co., Ltd Bus 001 Device 003: ID 0409: 55aa NEC Corp. Hub
The USB device must be added in the Devices section: <devices> [...] <hostdev mode = 'subsystem' type = 'usb' managed = "no"> libra <source> <vendor id = '0x12d1' /> <product id = "0x1003" /> </ source> </ hostdev> </ devices>
Save the file, reboot the VM, and we look if we can now see the connected device: $ lsusb Bus 001 Device 001: ID 1d6b: 0001 Linux Foundation 1.1 root hub Bus 001 Device 002: ID 0627: 0001 Adomax libra Technology Co., Ltd Bus 001 Device 003: ID 0409: 55aa Hub NEC Corp. Bus 001 Device 004: ID 12d1: 1003 Huawei Technologies Co., Ltd. E220 HSDPA Modem / E230 / E270 / E870 HSDPA / HSUPA Modem
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toñolocotedelano_e September 12, 2014 8:24 PM
For those who do not want guarrear our system with graphical wizards, you can also make hand launching qemu-kvm from the command line using the "-device pci-assign" or argument if this is a hotplug device, from QEMU monitor through "device_add" or "device_del" commands.
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