accessing USB disk-on-key from windows (under KVM)

accessing USB disk-on-key from windows (under KVM)

[Ian Brown]

Hello,
Is there a way to access a USB disk-on-key from windows which runs on
Linux under KVM?

Any help will be appreciated,

Regards,
Ian

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Re: accessing USB disk-on-key from windows (under KVM)

[Avi Kivity]

Ian Brown wrote:
> Hello,
> Is there a way to access a USB disk-on-key from windows which runs on
> Linux under KVM?
>
>   

You can add it as a regular disk (-hdb /dev/sdb or whatever it's called;
make sure it isn't mounted in the host) or maybe via the -usbdevice
option (don't know if/how that works at all).

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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Re: accessing USB disk-on-key from windows (under KVM)

[Anthony Liguori]

Avi Kivity wrote:
> Ian Brown wrote:
>   
>> Hello,
>> Is there a way to access a USB disk-on-key from windows which runs on
>> Linux under KVM?
>>
>>   
>>     
>
> You can add it as a regular disk (-hdb /dev/sdb or whatever it's called;
> make sure it isn't mounted in the host) or maybe via the -usbdevice
> option (don't know if/how that works at all).
>   

You have three options:

1) Expose it as -hdb /dev/sdb
2) Expose it as an emulated USB disk -usbdevice disk:/dev/sdb
3) Pass it through directly to the guest by disabling Linux from using 
the device and then passing it through with -usbdevice host:x.y

#1 will perform the best
#2 will give you the give you the most flexibility (you can remove the 
disk and insert at run time)
#3 would allow you to support exotic disks that go beyond the standard 
mass storage specification.

I'd recommend using #2.

Regards,

Anthony Liguori


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Re: accessing USB disk-on-key from windows (under KVM)

[Ian Brown]

Hello,

Thanks, Anthony.

I tried both #2 and #3.

It does not say any error, but still I cannot access the USB disk on key.
Maybe I miss something ?
Here are few more details.

When I ran:
/usr/local/kvm/bin/qemu-system-x86_64 -usbdevice disk:/dev/sdb
/work/kvm/win2003/vdisk.img -m 384
OR
/usr/local/kvm/bin/qemu-system-x86_64  -hdb /dev/sdb
/work/kvm/win2003/vdisk.img -m 384

windows started ok (it did not emit errors, as I said).

But I expected that clicking on "my computer" (or right clicking and
opening file explorer) will show me the USB storage disk,
and it did not. (I can see there only the hard disk and the CD).

Any ideas ?
Am I missing here something ?

Regards,
Ian






On 7/16/07, Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org> wrote:
> Avi Kivity wrote:
> > Ian Brown wrote:
> >
> >> Hello,
> >> Is there a way to access a USB disk-on-key from windows which runs on
> >> Linux under KVM?
> >>
> >>
> >>
> >
> > You can add it as a regular disk (-hdb /dev/sdb or whatever it's called;
> > make sure it isn't mounted in the host) or maybe via the -usbdevice
> > option (don't know if/how that works at all).
> >
>
> You have three options:
>
> 1) Expose it as -hdb /dev/sdb
> 2) Expose it as an emulated USB disk -usbdevice disk:/dev/sdb
> 3) Pass it through directly to the guest by disabling Linux from using
> the device and then passing it through with -usbdevice host:x.y
>
> #1 will perform the best
> #2 will give you the give you the most flexibility (you can remove the
> disk and insert at run time)
> #3 would allow you to support exotic disks that go beyond the standard
> mass storage specification.
>
> I'd recommend using #2.
>
> Regards,
>
> Anthony Liguori
>
>

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Re: accessing USB disk-on-key from windows (under KVM)

[Anthony Liguori]

Ian Brown wrote:
> Hello,
>
> Thanks, Anthony.
>
> I tried both #2 and #3.
>
> It does not say any error, but still I cannot access the USB disk on key.
> Maybe I miss something ?
> Here are few more details.
>
> When I ran:
> /usr/local/kvm/bin/qemu-system-x86_64 -usbdevice disk:/dev/sdb
> /work/kvm/win2003/vdisk.img -m 384

Try:

/usr/local/kvm/bin/qemu-system-x86_64 -usb -usbdevice disk:/dev/sdb 
/work/kvm/win2003/vdisk.img -m 384

Regards,

Anthony Liguori

> OR
> /usr/local/kvm/bin/qemu-system-x86_64  -hdb /dev/sdb
> /work/kvm/win2003/vdisk.img -m 384
>
> windows started ok (it did not emit errors, as I said).
>
> But I expected that clicking on "my computer" (or right clicking and
> opening file explorer) will show me the USB storage disk,
> and it did not. (I can see there only the hard disk and the CD).
>
> Any ideas ?
> Am I missing here something ?
>
> Regards,
> Ian
>
>
>
>
>
>
> On 7/16/07, Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org> wrote:
>> Avi Kivity wrote:
>> > Ian Brown wrote:
>> >
>> >> Hello,
>> >> Is there a way to access a USB disk-on-key from windows which runs on
>> >> Linux under KVM?
>> >>
>> >>
>> >>
>> >
>> > You can add it as a regular disk (-hdb /dev/sdb or whatever it's 
>> called;
>> > make sure it isn't mounted in the host) or maybe via the -usbdevice
>> > option (don't know if/how that works at all).
>> >
>>
>> You have three options:
>>
>> 1) Expose it as -hdb /dev/sdb
>> 2) Expose it as an emulated USB disk -usbdevice disk:/dev/sdb
>> 3) Pass it through directly to the guest by disabling Linux from using
>> the device and then passing it through with -usbdevice host:x.y
>>
>> #1 will perform the best
>> #2 will give you the give you the most flexibility (you can remove the
>> disk and insert at run time)
>> #3 would allow you to support exotic disks that go beyond the standard
>> mass storage specification.
>>
>> I'd recommend using #2.
>>
>> Regards,
>>
>> Anthony Liguori
>>
>>
>


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Re: accessing USB disk-on-key from windows (under KVM)

[Ian Brown]

Hello,
 -  I tried, as suggested:
/usr/local/kvm/bin/qemu-system-x86_64 -usb -usbdevice disk:/dev/sdb
/work/kvm/win2003/vdisk.img -m 384

it on x86_64 machine and it crashed the fedora core and rebooted the machine.


I tried it in fact twice: once when the USB disk on key was not
mounted, and once when
it was mounted (though I doubt if it has any importance in this case).

I wonder: could anybody access a USB disk on key from windows under
Linux (via KVM)?
can he share his experience and tell us exactly what he did ?

Regards,
Ian




On 7/18/07, Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org> wrote:
> Ian Brown wrote:
> > Hello,
> >
> > Thanks, Anthony.
> >
> > I tried both #2 and #3.
> >
> > It does not say any error, but still I cannot access the USB disk on key.
> > Maybe I miss something ?
> > Here are few more details.
> >
> > When I ran:
> > /usr/local/kvm/bin/qemu-system-x86_64 -usbdevice disk:/dev/sdb
> > /work/kvm/win2003/vdisk.img -m 384
>
> Try:
>
> /usr/local/kvm/bin/qemu-system-x86_64 -usb -usbdevice disk:/dev/sdb
> /work/kvm/win2003/vdisk.img -m 384
>
> Regards,
>
> Anthony Liguori
>
> > OR
> > /usr/local/kvm/bin/qemu-system-x86_64  -hdb /dev/sdb
> > /work/kvm/win2003/vdisk.img -m 384
> >
> > windows started ok (it did not emit errors, as I said).
> >
> > But I expected that clicking on "my computer" (or right clicking and
> > opening file explorer) will show me the USB storage disk,
> > and it did not. (I can see there only the hard disk and the CD).
> >
> > Any ideas ?
> > Am I missing here something ?
> >
> > Regards,
> > Ian
> >
> >
> >
> >
> >
> >
> > On 7/16/07, Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org> wrote:
> >> Avi Kivity wrote:
> >> > Ian Brown wrote:
> >> >
> >> >> Hello,
> >> >> Is there a way to access a USB disk-on-key from windows which runs on
> >> >> Linux under KVM?
> >> >>
> >> >>
> >> >>
> >> >
> >> > You can add it as a regular disk (-hdb /dev/sdb or whatever it's
> >> called;
> >> > make sure it isn't mounted in the host) or maybe via the -usbdevice
> >> > option (don't know if/how that works at all).
> >> >
> >>
> >> You have three options:
> >>
> >> 1) Expose it as -hdb /dev/sdb
> >> 2) Expose it as an emulated USB disk -usbdevice disk:/dev/sdb
> >> 3) Pass it through directly to the guest by disabling Linux from using
> >> the device and then passing it through with -usbdevice host:x.y
> >>
> >> #1 will perform the best
> >> #2 will give you the give you the most flexibility (you can remove the
> >> disk and insert at run time)
> >> #3 would allow you to support exotic disks that go beyond the standard
> >> mass storage specification.
> >>
> >> I'd recommend using #2.
> >>
> >> Regards,
> >>
> >> Anthony Liguori
> >>
> >>
> >
>
>

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Re: accessing USB disk-on-key from windows (under KVM)

[Daniel P. Berrange]

On Wed, Jul 18, 2007 at 10:32:06PM +0300, Ian Brown wrote:
> Hello,
> 
> Thanks, Anthony.
> 
> I tried both #2 and #3.
> 
> It does not say any error, but still I cannot access the USB disk on key.
> Maybe I miss something ?
> Here are few more details.
> 
> When I ran:
> /usr/local/kvm/bin/qemu-system-x86_64 -usbdevice disk:/dev/sdb
> /work/kvm/win2003/vdisk.img -m 384
> OR
> /usr/local/kvm/bin/qemu-system-x86_64  -hdb /dev/sdb
> /work/kvm/win2003/vdisk.img -m 384
> 
> windows started ok (it did not emit errors, as I said).
> 
> But I expected that clicking on "my computer" (or right clicking and
> opening file explorer) will show me the USB storage disk,
> and it did not. (I can see there only the hard disk and the CD).

IIRC you need to also give the '-usb'  arg to actually turn on USB bus
emulation, then the -usbdevice args will be used.

Regards,
Dan,
-- 
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