Re: Re: [Qemu-devel] usb and qemu

Re: Re: [Qemu-devel] usb and qemu

[Ben Taylor]

"Jim C. Brown" <jma5@umd.edu>
> 
> On Tue, Aug 09, 2005 at 10:33:31PM +0200, Michael Hoeller wrote:
> > Hello,
> > 
> > is there a way to access an usb stick from Windows which runs in qemu 
> > under Linux??
> > 
> > Michael
> > 
> 
> No.
> 
> http://usbip.naist.jp/ and http://sourceforge.net/projects/usbip/ might help
> if the guest and the host were both linux 2.6, however afaict usbip does not work
> under Windows yet.

I haven't tried it, but couldn't you either pass the
physical device (like /dev/sda) as -hdb, or mount up
the USB memory stick and use samba (either qemu's 
builtin or an existing samba server) to share it to
the window's guest?

Ben

Re: [Qemu-devel] usb and qemu

[vaise]

On Wednesday 10 August 2005 12:57, Ben Taylor wrote:
> I haven't tried it, but couldn't you either pass the
> physical device (like /dev/sda) as -hdb, or mount up
> the USB memory stick and use samba (either qemu's
> builtin or an existing samba server) to share it to
> the window's guest?
>
I do this way too
Dsant

Re: [Qemu-devel] usb and qemu

[Mark Williamson]

Isn't there a USB patch floating around somewhere (emulates OHCI in the 
guest)?  Or am I remembering something else?

Cheers,
Mark

On Wednesday 10 August 2005 11:57, Ben Taylor wrote:
> "Jim C. Brown" <jma5@umd.edu>
>
> > On Tue, Aug 09, 2005 at 10:33:31PM +0200, Michael Hoeller wrote:
> > > Hello,
> > >
> > > is there a way to access an usb stick from Windows which runs in qemu
> > > under Linux??
> > >
> > > Michael
> >
> > No.
> >
> > http://usbip.naist.jp/ and http://sourceforge.net/projects/usbip/ might
> > help if the guest and the host were both linux 2.6, however afaict usbip
> > does not work under Windows yet.
>
> I haven't tried it, but couldn't you either pass the
> physical device (like /dev/sda) as -hdb, or mount up
> the USB memory stick and use samba (either qemu's
> builtin or an existing samba server) to share it to
> the window's guest?
>
> Ben
>
>
>
>
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel

Re: [Qemu-devel] usb and qemu

[Paul Brook]

On Wednesday 10 August 2005 14:49, Mark Williamson wrote:
> > > http://usbip.naist.jp/ and http://sourceforge.net/projects/usbip/ might
> > > help if the guest and the host were both linux 2.6, however afaict usbip
> > > does not work under Windows yet.
>...
> Isn't there a USB patch floating around somewhere (emulates OHCI in the 
> guest)?

Yes, but noone's written the code to wire it up to host devices. AFAIK it 
currently emulates the host controller and not much else.

Using the usb-over-ip protocol mentioned above seems like a nice way of 
getting it to talk to host USB devices in a host-independent way.

Paul

Re: [Qemu-devel] usb and qemu

[Jim C. Brown]

On Wed, Aug 10, 2005 at 03:03:25PM +0100, Paul Brook wrote:
> > Isn't there a USB patch floating around somewhere (emulates OHCI in the 
> > guest)?
> 
> Yes, but noone's written the code to wire it up to host devices. AFAIK it 
> currently emulates the host controller and not much else.
> 
> Using the usb-over-ip protocol mentioned above seems like a nice way of 
> getting it to talk to host USB devices in a host-independent way.

IIRC, one of the authors of the patch wanted to use usbip in qemu, so the guest
could see and use host usb devices (thinking that they were connected to the
virtual machine) without having to be aware of, or have support for, usbip.

-- 
Infinite complexity begets infinite beauty.
Infinite precision begets infinite perfection.

Re: [Qemu-devel] usb and qemu

[Paul Brook]

On Wednesday 10 August 2005 18:07, Jim C. Brown wrote:
> On Wed, Aug 10, 2005 at 03:03:25PM +0100, Paul Brook wrote:
> > > Isn't there a USB patch floating around somewhere (emulates OHCI in the
> > > guest)?
> >
> > Yes, but noone's written the code to wire it up to host devices. AFAIK it
> > currently emulates the host controller and not much else.
> >
> > Using the usb-over-ip protocol mentioned above seems like a nice way of
> > getting it to talk to host USB devices in a host-independent way.
>
> IIRC, one of the authors of the patch wanted to use usbip in qemu, so the
> guest could see and use host usb devices (thinking that they were connected
> to the virtual machine) without having to be aware of, or have support for,
> usbip.

Right, that's what I meant.

Paul

Re: [Qemu-devel] usb and qemu

[Mark Williamson]

> > Isn't there a USB patch floating around somewhere (emulates OHCI in the
> > guest)?
>
> Yes, but noone's written the code to wire it up to host devices. AFAIK it
> currently emulates the host controller and not much else.

Oh, OK that makes sense.

> Using the usb-over-ip protocol mentioned above seems like a nice way of
> getting it to talk to host USB devices in a host-independent way.

Actually that'd be a fairly neat trick...  As an alternative, IIRC there's a 
user space API for writing USB drivers under Linux - using that you could get 
access to both local and remote (IP encapsulated) USB devices, albeit not in 
a cross-platform (host-wise) way.

Cheers,
Mark

Re: [Qemu-devel] usb and qemu

[Lonnie Mendez]

On Wednesday 10 August 2005 5:10 pm, Mark Williamson wrote:
> > > Isn't there a USB patch floating around somewhere (emulates OHCI in the
> > > guest)?
> >
> > Yes, but noone's written the code to wire it up to host devices. AFAIK it
> > currently emulates the host controller and not much else.
> 
> Oh, OK that makes sense.
> 
> > Using the usb-over-ip protocol mentioned above seems like a nice way of
> > getting it to talk to host USB devices in a host-independent way.
> 
> Actually that'd be a fairly neat trick...  As an alternative, IIRC there's a 
> user space API for writing USB drivers under Linux - using that you could 
get 
> access to both local and remote (IP encapsulated) USB devices, albeit not in 
> a cross-platform (host-wise) way.

   That would be called libusb.  The libusb V1_0_DEVEL branch would be the 
prime candidate for this "wiring up", but is however incomplete.  libusb 
(<=0.1.10a) does not support asynchronous communications and does not have an 
api to deal with isochronous usb transfers as well.  I've been messing around 
with the ohci-hc / libusb 1.0 connection, albeit slowly.

Re: [Qemu-devel] usb and qemu

[Mark Williamson]

> > Actually that'd be a fairly neat trick...  As an alternative, IIRC
> > there's a user space API for writing USB drivers under Linux - using that
> > you could
>
> get
>
> > access to both local and remote (IP encapsulated) USB devices, albeit not
> > in a cross-platform (host-wise) way.
>
>    That would be called libusb.  The libusb V1_0_DEVEL branch would be the
> prime candidate for this "wiring up", but is however incomplete.  libusb
> (<=0.1.10a) does not support asynchronous communications and does not have
> an api to deal with isochronous usb transfers as well.  I've been messing
> around with the ohci-hc / libusb 1.0 connection, albeit slowly.

Ah, OK.  I guess you can still get a good subset of functionality without iso 
transfers (e.g. supporting pendrives, network drives, etc.).  Do you find 
libusb to be good to work with?  I've done some similar stuff in the past but 
at the kernel level, rather than in user space.

Cheers,
Mark

Re: Re: [Qemu-devel] usb and qemu

[Jim C. Brown]

On Wed, Aug 10, 2005 at 06:57:14AM -0400, Ben Taylor wrote:
> I haven't tried it, but couldn't you either pass the
> physical device (like /dev/sda) as -hdb, or mount up
> the USB memory stick and use samba (either qemu's 
> builtin or an existing samba server) to share it to
> the window's guest?
> 
> Ben
> 

Yes, silly me. That should work fine (with samba you could even swap usb sticks
while the guest was running).

-- 
Infinite complexity begets infinite beauty.
Infinite precision begets infinite perfection.

[Qemu-devel] usb and qemu

[Michael Hoeller]

Hello,

is there a way to access an usb stick from Windows which runs in qemu 
under Linux??

Michael

Re: [Qemu-devel] usb and qemu

[Jim C. Brown]

On Tue, Aug 09, 2005 at 10:33:31PM +0200, Michael Hoeller wrote:
> Hello,
> 
> is there a way to access an usb stick from Windows which runs in qemu 
> under Linux??
> 
> Michael
> 

No.

http://usbip.naist.jp/ and http://sourceforge.net/projects/usbip/ might help
if the guest and the host were both linux 2.6, however afaict usbip does not work
under Windows yet.

-- 
Infinite complexity begets infinite beauty.
Infinite precision begets infinite perfection.

Re: [Qemu-devel] usb and qemu

[Paul Brook]

On Tuesday 09 August 2005 21:33, Michael Hoeller wrote:
> Hello,
>
> is there a way to access an usb stick from Windows which runs in qemu
> under Linux??

You can use the usb block device directly as a hard disk "image". ie something 
like
qemu -hdb /dev/sda ...

Obviously the guest will see it as an IDE drive, and hotpluging hasn't got a 
hope of working, but it's probably near enough for most purposes.

Note that you should never mount the same device on both the host and the 
guest at the same time. Doing so will cause data corruption.

Paul