On Fri, Aug 27, 2010 at 06:16:32PM +0530, Dhananjay Goel wrote:
> 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.
>
That's NOT USB sharing at all!
That's just a general filesystem share (nfs,cifs,whatever network share).
You can do that with Xen, over the network, just like with physical machines.
-- Pasi
> Thanks,
> Dhananjay
>
> On Fri, Aug 27, 2010 at 5:24 PM, Pasi K*rkk*inen <[1]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*rkk*inen
> <[1][2]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*rkk*inen
> > * * *<[1][2][3]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][4]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*rkk*inen
> > * * *> * * *<[1][3][4][5]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][6]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][7]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][8]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * * *> * * *> * * *> * *2.
> mailto:[5][7][8][9]james.harper@xxxxxxxxxxxxxxxx
> > * * *> * * *>
> > * * *> * * *> References
> > * * *> * * *>
> > * * *> * * *> * *Visible links
> > * * *> * * *> * *1. mailto:[8][9][10]pasik@xxxxxx
> > * * *> * * *> * *2.
> > * * *[9][10][11]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * * *> * * *> * *3. mailto:[10][11][12]james.harper@xxxxxxxxxxxxxxxx
> > * * *> * * *> * *4.
> > * * *[11][12][13]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * * *> * * *> * *5. mailto:[12][13][14]james.harper@xxxxxxxxxxxxxxxx
> > * * *>
> > * * *> References
> > * * *>
> > * * *> * *Visible links
> > * * *> * *1. mailto:[14][15]pasik@xxxxxx
> > * * *> * *2.
> [15][16]http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> > * * *> * *3. mailto:[16][17]pasik@xxxxxx
> > * * *> * *4.
> [17][18]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * * *> * *5. mailto:[18][19]james.harper@xxxxxxxxxxxxxxxx
> > * * *> * *6.
> [19][20]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * * *> * *7. mailto:[20][21]james.harper@xxxxxxxxxxxxxxxx
> > * * *> * *8. mailto:[21][22]pasik@xxxxxx
> > * * *> * *9.
> [22][23]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * * *> * 10. mailto:[23][24]james.harper@xxxxxxxxxxxxxxxx
> > * * *> * 11.
> [24][25]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * * *> * 12. mailto:[25][26]james.harper@xxxxxxxxxxxxxxxx
> >
> > References
> >
> > * *Visible links
> > * *1. mailto:[27]pasik@xxxxxx
> > * *2. mailto:[28]pasik@xxxxxx
> > * *3. [29]http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> > * *4. mailto:[30]pasik@xxxxxx
> > * *5. [31]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * *6. mailto:[32]james.harper@xxxxxxxxxxxxxxxx
> > * *7. [33]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * *8. mailto:[34]james.harper@xxxxxxxxxxxxxxxx
> > * *9. mailto:[35]pasik@xxxxxx
> > * 10. [36]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * 11. mailto:[37]james.harper@xxxxxxxxxxxxxxxx
> > * 12. [38]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * 13. mailto:[39]james.harper@xxxxxxxxxxxxxxxx
> > * 14. mailto:[40]pasik@xxxxxx
> > * 15. [41]http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> > * 16. mailto:[42]pasik@xxxxxx
> > * 17. [43]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * 18. mailto:[44]james.harper@xxxxxxxxxxxxxxxx
> > * 19. [45]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * 20. mailto:[46]james.harper@xxxxxxxxxxxxxxxx
> > * 21. mailto:[47]pasik@xxxxxx
> > * 22. [48]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * 23. mailto:[49]james.harper@xxxxxxxxxxxxxxxx
> > * 24. [50]http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> > * 25. mailto:[51]james.harper@xxxxxxxxxxxxxxxx
>
> References
>
> Visible links
> 1. mailto:pasik@xxxxxx
> 2. mailto:pasik@xxxxxx
> 3. mailto:pasik@xxxxxx
> 4. http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> 5. mailto:pasik@xxxxxx
> 6. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 7. mailto:james.harper@xxxxxxxxxxxxxxxx
> 8. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 9. mailto:james.harper@xxxxxxxxxxxxxxxx
> 10. mailto:pasik@xxxxxx
> 11. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 12. mailto:james.harper@xxxxxxxxxxxxxxxx
> 13. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 14. mailto:james.harper@xxxxxxxxxxxxxxxx
> 15. mailto:pasik@xxxxxx
> 16. http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> 17. mailto:pasik@xxxxxx
> 18. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 19. mailto:james.harper@xxxxxxxxxxxxxxxx
> 20. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 21. mailto:james.harper@xxxxxxxxxxxxxxxx
> 22. mailto:pasik@xxxxxx
> 23. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 24. mailto:james.harper@xxxxxxxxxxxxxxxx
> 25. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 26. mailto:james.harper@xxxxxxxxxxxxxxxx
> 27. mailto:pasik@xxxxxx
> 28. mailto:pasik@xxxxxx
> 29. http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> 30. mailto:pasik@xxxxxx
> 31. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 32. mailto:james.harper@xxxxxxxxxxxxxxxx
> 33. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 34. mailto:james.harper@xxxxxxxxxxxxxxxx
> 35. mailto:pasik@xxxxxx
> 36. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 37. mailto:james.harper@xxxxxxxxxxxxxxxx
> 38. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 39. mailto:james.harper@xxxxxxxxxxxxxxxx
> 40. mailto:pasik@xxxxxx
> 41. http://wiki.xensource.com/xenwiki/XenVGAPassthrough
> 42. mailto:pasik@xxxxxx
> 43. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 44. mailto:james.harper@xxxxxxxxxxxxxxxx
> 45. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 46. mailto:james.harper@xxxxxxxxxxxxxxxx
> 47. mailto:pasik@xxxxxx
> 48. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 49. mailto:james.harper@xxxxxxxxxxxxxxxx
> 50. http://wiki.xensource.com/xenwiki/XenUSBPassthrough
> 51. mailto:james.harper@xxxxxxxxxxxxxxxx
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