On 06/16/2015 01:10 PM, Ian Jackson wrote:
Jürgen Groß writes ("Re: [Xen-devel] [PATCH V4 3/7] libxl: add pvusb API"):
On 06/16/2015 12:41 PM, Ian Jackson wrote:
Is the busid more stable in the face of plug/unplug ? This is the
normal reason for a more path-like device specification.
...
Unfortunately the busid isn't stable at least across reboots.
I see.
Presumably the busdev isn't either. We need to be let users specify
something that _is_ stable, obviously.
On my netbook I have this kind of thing in /etc/fstab:
/dev/disk/by-path/pci-0000:00:1d.7-usb-0:1:1.0-scsi-0:0:0:0-part1 /media/usb1
auto rw,user,noauto 0 0
Is a similar specification possible ?
qemu does support specifying a USB device via <vendorId>:<productId>,
which is stable even across reboots, but unfortunately it isn't
guaranteed to be unique (you can have plugged in two devices of the
same type).
Indeed. That would also be a thing we should allow people to do.
AIUI some devices have serial numbers, which means you can distinguish
them ?
Yes, they have. The question is whether those are different on multiple
instances? With "lsusb" I've found a device with serial number
0123456789ABCD. Do you really believe I'm just lucky owning the one with
such a nice serial number? ;-)
Juergen
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