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Re: [Xen-devel] Virtualization project idea

from [Dhananjay Goel] [Permanent Link][Original]
To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] Virtualization project idea
From: Dhananjay Goel <dhananjaygoel123@xxxxxxxxx>
Date: Fri, 27 Aug 2010 18:16:32 +0530
Cc: James Harper <james.harper@xxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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How are you sharing USB flash drives with physical machines

Comment: In ubuntu, plug in flash drive and access /media folder. Then right click and click on "Sharing Options". Once you share it and give others the right to add/edit the files, they can do so.

Thanks,
Dhananjay


On Fri, Aug 27, 2010 at 5:24 PM, Pasi K�k�en <pasik@xxxxxx> wrote:
On Fri, Aug 27, 2010 at 04:56:33PM +0530, Dhananjay Goel wrote:
> � �Also you wouldn't see the changes made in other VMs,
> � �unless you made sure all the caches are refreshed etc in the VM all the
> � �time.
>
> � �You'd need to use some cluster-filesystem (GFS, GFS2, OCFS2, GPFS, etc).
> � �--Can you please suggest how NFS manages this because this case is handled
> � �by NFS without any corruption?
> � �We can share flash drive across VMs as we do with physical machines in
> � �LAN. Please help!
>

How are you sharing USB flash drives with physical machines?

-- Pasi

> � �Thanks,
> � �Dhananjay
>
> � �On Fri, Aug 27, 2010 at 4:27 PM, Pasi K�k�en <[1]pasik@xxxxxx> wrote:
>
> � � �On Fri, Aug 27, 2010 at 02:53:54PM +0530, Dhananjay Goel wrote:
> � � �> � �This won't be straight forward. Think about USB memory/flash stick.
> � � �> � �If every VM sees it, and simultaneously writes to it, the
> � � �filesystem
> � � �> � �in it will get corrupted immediately!
> � � �>
> � � �> � �--Why would it get corrupted immediately. Might be we can just lock
> � � �a
> � � �> � �specific file which is being edited? Please suggest.
> � � �>
>
> � � �Because USB level has no idea about filesystems or files, or locking
> � � �them!
>
> � � �Say you're using ext3 or NTFS in the VM for the USB device.
> � � �Those filesystems are NOT cluster-aware, ie. they're not aware of any
> � � �sharing,
> � � �and they don't support any kind of sharing.
>
> � � �They expect exclusive access to the device.
>
> � � �If suddenly the bits on the device change from outside,
> � � �the filesystem gets corrupted very easily.
>
> � � �Also you wouldn't see the changes made in other VMs,
> � � �unless you made sure all the caches are refreshed etc in the VM all the
> � � �time.
>
> � � �You'd need to use some cluster-filesystem (GFS, GFS2, OCFS2, GPFS, etc).
>
> � � �-- Pasi
>
> � � �> � �Thanks,
> � � �> � �Dhananjay
> � � �>
> � � �> � �On Fri, Aug 27, 2010 at 2:49 PM, Pasi K�k�en
> � � �<[1][2]pasik@xxxxxx> wrote:
> � � �>
> � � �> � � �On Fri, Aug 27, 2010 at 02:45:12PM +0530, Dhananjay Goel wrote:
> � � �> � � �> � �No, that's not possible with pvusb. pvusb is for direct
> � � �passthru to
> � � �> � � �> � �one/single vm.
> � � �> � � �> � �You'd need some filesystem share (cifs/nfs/whatnot) to make
> � � �such
> � � �> � � �sharing
> � � �> � � �> � �possible.
> � � �> � � �> � �Comments: Is it possible to share USB keyboard, USB mouse,
> � � �USB
> � � �> � � �modem, etc
> � � �> � � �> � �across VMs i.e host and guest(s)? If we connect USB
> � � �keyboard, is it
> � � �> � � �> � �possible to use it in guests?
> � � �> � � �>
> � � �>
> � � �> � � �This is implemented in XCI (Xen Client Initiative), and there has
> � � �been
> � � �> � � �some discussions how to get it traditional Xen, to help Xen VGA
> � � �> � � �Passthrough usage.
> � � �>
> � � �> � � �See: [2][3]http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> � � �> � � �> � �Also, is it possible for us to modify the device driver of
> � � �USB 2.0
> � � �> � � �so that
> � � �> � � �> � �all USB 2.0 devices are visible and can be used across all
> � � �VMs?
> � � �> � � �Please
> � � �> � � �> � �suggest.
> � � �> � � �>
> � � �>
> � � �> � � �This won't be straight forward. Think about USB memory/flash
> � � �stick.
> � � �> � � �If every VM sees it, and simultaneously writes to it, the
> � � �filesystem
> � � �> � � �in it will get corrupted immediately!
> � � �>
> � � �> � � �USB Passthru cannot be used to 'share' devices, it's for giving
> � � �> � � �one/single VM
> � � �> � � �direct access to the device.
> � � �>
> � � �> � � �-- Pasi
> � � �>
> � � �> � � �> � �Thanks,
> � � �> � � �> � �Dhananjay
> � � �> � � �>
> � � �> � � �> � �On Fri, Aug 27, 2010 at 2:16 PM, Pasi K�k�en
> � � �> � � �<[1][3][4]pasik@xxxxxx> wrote:
> � � �> � � �>
> � � �> � � �> � � �On Fri, Aug 27, 2010 at 01:37:49PM +0530, Dhananjay Goel
> � � �wrote:
> � � �> � � �> � � �> � �Hi James/Pasi,
> � � �> � � �> � � �> � �I had a look at
> � � �> � � �>
> � � � [1][2][4][5]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � � �> � � �> � � �> � �But I'm not sure if it supports sharing USB devices
> � � �across
> � � �> � � �VMs
> � � �> � � �> � � �(host and
> � � �> � � �> � � �> � �guest) i.e. if I plug in a flash drive then it would
> � � �detect
> � � �> � � �in both
> � � �> � � �> � � �host
> � � �> � � �> � � �> � �and guest and I'd be able edit files from all VMs
> � � �rather
> � � �> � � �than
> � � �> � � �> � � �mounting and
> � � �> � � �> � � �> � �unmounting everytime from 1 VM to other.
> � � �> � � �> � � �> � �Please let me know your thoughts on it.
> � � �> � � �> � � �>
> � � �> � � �>
> � � �> � � �> � � �No, that's not possible with pvusb. pvusb is for direct
> � � �passthru
> � � �> � � �to
> � � �> � � �> � � �one/single vm.
> � � �> � � �> � � �You'd need some filesystem share (cifs/nfs/whatnot) to
> � � �make such
> � � �> � � �sharing
> � � �> � � �> � � �possible.
> � � �> � � �>
> � � �> � � �> � � �-- Pasi
> � � �> � � �> � � �> � �Thanks,
> � � �> � � �> � � �> � �Dhananjay
> � � �> � � �> � � �>
> � � �> � � �> � � �> � �On Fri, Aug 27, 2010 at 4:28 AM, James Harper
> � � �> � � �> � � �> � �<[2][3][5][6]james.harper@xxxxxxxxxxxxxxxx> wrote:
> � � �> � � �> � � �>
> � � �> � � �> � � �> � � �> Hi there!
> � � �> � � �> � � �> � � �>
> � � �> � � �> � � �> � � �> First I'd like to say that XEN plaform is really
> � � �cool
> � � �> � � �and
> � � �> � � �> � � �awesome.
> � � �> � � �> � � �> � � �>
> � � �> � � �> � � �> � � �> I'm an engineering student and is searching for a
> � � �> � � �feasible
> � � �> � � �> � � �project in
> � � �> � � �> � � �> � � �> virtualization. I'd like to know if its possible
> � � �to
> � � �> � � �share USB
> � � �> � � �> � � �devices
> � � �> � � �> � � �> � � �(flash
> � � �> � � �> � � �> � � �> drive, hard disk, mouse, keyboards etc) across
> � � �guests
> � � �> � � �and host
> � � �> � � �> � � �(VMs).
> � � �> � � �> � � �> � � �Also, do
> � � �> � � �> � � �> � � �> you have any idea to extend it? Or any innovative
> � � �idea
> � � �> � � �so that
> � � �> � � �> � � �we can
> � � �> � � �> � � �> � � �> implement it.
> � � �> � � �> � � �> � � �>
> � � �> � � �> � � �> � � �> I'd appreciate any help. Thanks in advance.
> � � �> � � �> � � �> � � �>
> � � �> � � �> � � �>
> � � �> � � �> � � �> � � �Further to what Pasi said, I have partially ported
> � � �the
> � � �> � � �backend
> � � �> � � �> � � �interface
> � � �> � � �> � � �> � � �and can hand you the code if you want. It's
> � � �probable a bit
> � � �> � � �stale
> � � �> � � �> � � �vs the
> � � �> � � �> � � �> � � �current kernels and leaks memory under some
> � � �circumstances
> � � �> � � �but is
> � � �> � � �> � � �> � � �probably better than starting from scratch.
> � � �> � � �> � � �> � � �James
> � � �> � � �> � � �>
> � � �> � � �> � � �> References
> � � �> � � �> � � �>
> � � �> � � �> � � �> � �Visible links
> � � �> � � �> � � �> � �1.
> � � �[4][6][7]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � � �> � � �> � � �> � �2. mailto:[5][7][8]james.harper@xxxxxxxxxxxxxxxx
> � � �> � � �>
> � � �> � � �> References
> � � �> � � �>
> � � �> � � �> � �Visible links
> � � �> � � �> � �1. mailto:[8][9]pasik@xxxxxx
> � � �> � � �> � �2.
> � � �[9][10]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � � �> � � �> � �3. mailto:[10][11]james.harper@xxxxxxxxxxxxxxxx
> � � �> � � �> � �4.
> � � �[11][12]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � � �> � � �> � �5. mailto:[12][13]james.harper@xxxxxxxxxxxxxxxx
> � � �>
> � � �> References
> � � �>
> � � �> � �Visible links
> � � �> � �1. mailto:[14]pasik@xxxxxx
> � � �> � �2. [15]http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> � � �> � �3. mailto:[16]pasik@xxxxxx
> � � �> � �4. [17]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � � �> � �5. mailto:[18]james.harper@xxxxxxxxxxxxxxxx
> � � �> � �6. [19]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � � �> � �7. mailto:[20]james.harper@xxxxxxxxxxxxxxxx
> � � �> � �8. mailto:[21]pasik@xxxxxx
> � � �> � �9. [22]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � � �> � 10. mailto:[23]james.harper@xxxxxxxxxxxxxxxx
> � � �> � 11. [24]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � � �> � 12. mailto:[25]james.harper@xxxxxxxxxxxxxxxx
>
> References
>
> � �Visible links
> � �1. mailto:pasik@xxxxxx
> � �2. mailto:pasik@xxxxxx
> � �3. http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> � �4. mailto:pasik@xxxxxx
> � �5. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � �6. mailto:james.harper@xxxxxxxxxxxxxxxx
> � �7. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � �8. mailto:james.harper@xxxxxxxxxxxxxxxx
> � �9. mailto:pasik@xxxxxx
> � 10. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � 11. mailto:james.harper@xxxxxxxxxxxxxxxx
> � 12. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � 13. mailto:james.harper@xxxxxxxxxxxxxxxx
> � 14. mailto:pasik@xxxxxx
> � 15. http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> � 16. mailto:pasik@xxxxxx
> � 17. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � 18. mailto:james.harper@xxxxxxxxxxxxxxxx
> � 19. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � 20. mailto:james.harper@xxxxxxxxxxxxxxxx
> � 21. mailto:pasik@xxxxxx
> � 22. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � 23. mailto:james.harper@xxxxxxxxxxxxxxxx
> � 24. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> � 25. mailto:james.harper@xxxxxxxxxxxxxxxx

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