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Re: [Qemu-devel] external usb flash drive support on qemu virtualization

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] external usb flash drive support on qemu virtualization
Date: Thu, 20 Oct 2016 16:52:21 +0100

On Thu, Oct 20, 2016 at 4:07 PM, Kumar Girish
<address@hidden> wrote:
> I have analysed my code and added the usb configuration while spawning the 
> guest CMM. Unfortunately still the usb is not visible.
> Could you please help me on this.
> I added this config   "-usb -usbdevice host:090c:1000 " . you can see in the 
> last but one line
> Following is my config
> /bin/qemu-system-x86_64 -aos cmm -smp 2 -m 3072 -aosimage 
> /flash/working/Mos.img -device virtio-prestera --enable-kvm -machine 
> accel=kvm -qmp tcp:,server,nowait -netdev 
> type=tap,id=eth0,ifname=tun0cmm,script=no,downscript=no  -device 
> virtio-net-pci,netdev=eth0,mac=2c:fa:a2:0a:29:46  -netdev 
> type=tap,id=eth1,ifname=tun1cmm,script=no,downscript=no  -device 
> virtio-net-pci,netdev=eth1,mac=00:0a:1e:11:11:f8  -netdev 
> type=tap,id=eth2,ifname=tun2cmm,script=no,downscript=no  -device 
> virtio-net-pci,netdev=eth2  -netdev 
> type=tap,id=eth3,ifname=tun3cmm,script=no,downscript=no  -device 
> virtio-net-pci,netdev=eth3,mac=00:0a:1e:11:11:f8 -netdev 
> type=tap,id=eth4,ifname=tun4cmm,script=no,downscript=no  -device 
> virtio-net-pci,netdev=eth4 -nographic -pidfile /CMMGuestPid -append -usb 
> -usbdevice host:090c:1000  "console=ttyS0 empipaddr= 
> empnetmask= empgateway= medora_early.ALU_VMSlotNum=0 
> medora_early.ALU_VMPrimaryA=1 medora_early.ALU_VMIsCmm=1"
> Have few questions please clarify.
> 1. Is it possible to add usb configuration once the guest is UP. That is 
> dynamically adding the usb configuration

Yes.  The usb_add/usb_del monitor commands or device_add/device_del
can be used.  I don't know the exact syntax, sorry.

> 2. Once the configuration is done,  should I unplug and plug the usb flash 
> stick (pendrive)

I believe the physical USB device must be plugged into the host before
you tell QEMU to add the device.

> 3. does lsusb show usb devices at guest also



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