Red Hat Bugzilla – Bug 589130
USB disk not marked as removable
Last modified: 2013-01-09 17:32:31 EST
Description of problem:
I recently needed to simulate a USB stick so that anaconda can load an updates.img contents from it. I added USB disk in virt-manager to my virtual machine and mounted the image, but anaconda didn't show it. According to hansg this is a virt bug.
(14:52:38) hansg: kparal, if the delay=0 thingie does not work, can you bot F-13 again in a virtual machine with the usb disk connected, and the do cat /sys/block/sda/capability, and tell me the output
(14:54:43) kparal: hansg: # cat /sys/block/sda/capability
(14:54:43) kparal: 52
(14:55:54) hansg: kparal, ok that is the issue, that is GENHD_FL_SUPPRESS_PARTITION_INFO + GENHD_FL_UP + GENHD_FL_MEDIA_CHANGE_NOTIFY
(14:56:19) hansg: So it does not include GENHD_FL_REMOVABLE, hence we do not show it in the list of devices to choice from where your updates.img is located.
(14:56:50) hansg: [hans@localhost ~]$ cat /sys/block/sdb/capability
(14:56:51) hansg: 53
(14:57:11) hansg: This is with a real usb stick on real hardware, and the 1 difference is GENHD_FL_REMOVABLE
(14:57:25) hansg: So I'm going to call this a virt bug.
Version-Release number of selected component (if applicable):
Created attachment 411592 [details]
virtual machine descriptor
Reproduced this. The device is definitely appearing as a USB MSD device in the guest. The 'removeable' flag in the kernel appears to be set based on the result of SCSI INQUIRY command, so it would seem that QEMU is not returning suitable data for this command with USB MSD devices.
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This is still an issue for Fedora 14.
This has been filed upstream as https://bugs.launchpad.net/qemu/+bug/686613 for additional tracking.
F14 is end-of-life now. If anyone is still affected by this bug with newer qemu versions, I'd recommend following up in the (still open) upstream bug report mentioned in Comment #5