[SOLVED] QEMU - Failed to initialize USB device 'usb-storage': Block node is read-only

nisargshah95 · 01-11-2018, 09:24 AM

I'm using QEMU version 2.10.1(Debian 1:2.10+dfsg-0ubuntu3.1) on an Ubuntu 17.10 64-bit system. I'm trying to start a VM with USB drive attached with the following command -

Code:

$ qemu-system-i386 -L . -m 256 -fda kolibri.img -boot a -localtime -vga vmware -net nic,model=rtl8139 -net user -soundhw ac97 -usb -usbdevice disk:format=raw:fat:/media/drive/drive/ -usbdevice tablet

I have a USB drive mounted on /media/drive/drive. I get the following response

Code:

qemu-system-i386: -usbdevice disk:format=raw:fat:/media/drive/drive/: '-usbdevice' is deprecated, please use '-device usb-...' instead
qemu-system-i386: -usbdevice tablet: '-usbdevice' is deprecated, please use '-device usb-...' instead
WARNING: Image format was not specified for 'kolibri.img' and probing guessed raw.
         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
         Specify the 'raw' format explicitly to remove the restrictions.
vvfat /media/drive/drive/ chs 1024,16,63
qemu-system-i386: -usbdevice disk:format=raw:fat:/media/drive/drive/: Failed to initialize USB device 'usb-storage': Block node is read-only
qemu-system-i386: -usbdevice disk:format=raw:fat:/media/drive/drive/: could not add USB device 'disk:format=raw:fat:/media/drive/drive/'

I can create files on /media/drive/drive with current user permissions. How do I fix it for the VM to start with the USB drive attached?

BW-userx · 01-11-2018, 09:45 AM

Quote:

'-usbdevice' is deprecated, please use ---> '-device usb-...

did you try that yet?
and this is what it is doing making read only

Code:

 Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
 Specify the 'raw' format explicitly to remove the restrictions.

gives examples of using the proper update calls ( -device usb- ) to mount usb device.

https://www.linux-kvm.org/page/USB_H...igned_to_Guest

nisargshah95 · 01-14-2018, 10:40 AM

Quote:

Originally Posted by BW-userx

https://www.linux-kvm.org/page/USB_H...igned_to_Guest

Thanks. I fixed the disk format issue, but specifying '-device usb-tablet' gives me an error

Code:

$ qemu-system-i386 -L . -m 256 -drive file=kolibri.img,media=disk,format=raw,if=floppy -boot a -localtime -vga vmware -net nic,model=rtl8139 -net user -soundhw ac97 -device usb-tablet -device usb-host,hostbus=2,hostaddr=10

qemu-system-i386: -device usb-tablet: No 'usb-bus' bus found for device 'usb-tablet'

Even removing usb-tablet gives the same error for usb-host

Code:

$ qemu-system-i386 -L . -m 256 -drive file=kolibri.img,media=disk,format=raw,if=floppy -boot a -localtime -vga vmware -net nic,model=rtl8139 -net user -soundhw ac97 -device usb-host,hostbus=2,hostaddr=10

qemu-system-i386: -device usb-host,hostbus=2,hostaddr=10: No 'usb-bus' bus found for device 'usb-host'

BW-userx · 01-14-2018, 02:15 PM

looks like you missed a step,
is it written like this

Code:

-device usb-host,hostbus=2,hostaddr=3 to add the host's USB device at Bus 2, Device 3. Simple as that.

lsusb gives me this

Code:

Bus 005 Device 002: ID 04e8:6860 Samsung Electronics Co., Ltd Galaxy (MTP)
#that tell me I should write it as such
-device usb-host,hostbus=5,hostaddr=2

try writing it like that, but looking again you did, I suppose, then ther is tis]

Quote:

This HOWTO is limited to UHCI devices (no USB2 EHCI).

I found this on how to see what type of USB controler you're dealing with,

mine shows only the number 1 or 2 so even I am still lost if it is a UHCI or EHCI
https://wiki.debian.org/HowToIdentifyADevice/USB

nisargshah95 · 01-15-2018, 08:46 AM

lsusb gives me

Code:

$ lsusb
Bus 001 Device 004: ID 0bda:5776 Realtek Semiconductor Corp. 
Bus 001 Device 003: ID 0bda:b001 Realtek Semiconductor Corp. 
Bus 001 Device 002: ID 8087:8000 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 013: ID 0bda:8179 Realtek Semiconductor Corp. RTL8188EUS 802.11n Wireless Network Adapter
Bus 002 Device 012: ID 04ca:0061 Lite-On Technology Corp. 
Bus 002 Device 011: ID 413c:2107 Dell Computer Corp. 
Bus 002 Device 010: ID 0781:5567 SanDisk Corp. Cruzer Blade
Bus 002 Device 009: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Here "SanDisk Cruzer Blade" is my USB drive. So the hostbus and hostaddr values seem to be correct.

EDIT: It seems I was missing the -usb option to enable the USB driver. Thank you very much for the help!

BW-userx · 01-15-2018, 10:22 AM

so its working now.. yes! enjoy!