Re: USB passthrough in QEMU

[Vitaly Shevtsov <shev.vt1984%gmail.com@localhost>]

> On NetBSD,qemu allows passing an nVidia GPU from the host to a Linux and /or Windows guest ? thanks.

I don't think so (but I could be wrong). But it definitely requires
IOMMU, which I doubt NVMM supports.

On Tue, Mar 25, 2025 at 1:35 AM Mario Marietto <marietto2008%gmail.com@localhost> wrote:
>
> Just a question :
>
> On NetBSD,qemu allows passing an nVidia GPU from the host to a Linux and /or Windows guest ? thanks.
>
> On Mon, Mar 24, 2025 at 9:31 PM Vitaly Shevtsov <shev.vt1984%gmail.com@localhost> wrote:
>>
>> It's just a USB stick (Kingston DataTraveler)
>>
>> It's recognized by the kernel as:
>> [ 15381.341529] umass0 at uhub5 port 2 configuration 1 interface 0
>> [ 15381.341529] umass0: Kingston (0x0951) DataTraveler 3.0 (0x1666),
>> rev 2.10/0.01, addr 7
>> [ 15381.341529] umass0: using SCSI over Bulk-Only
>> [ 15381.351529] scsibus0 at umass0: 2 targets, 1 lun per target
>> [ 15381.351529] sd0 at scsibus0 target 0 lun 0: <Kingston,
>> DataTraveler 3.0, > disk removable
>> [ 15381.351529] sd0: fabricating a geometry
>> [ 15381.351529] sd0: 29510 MB, 29510 cyl, 64 head, 32 sec, 512
>> bytes/sect x 60437492 sectors
>> [ 15381.361604] sd0: fabricating a geometry
>> [ 15381.361604] sd0: GPT GUID: 4e0321bd-dfee-47ad-b2dc-4879b9721620
>> [ 15381.361604] dk4 at sd0: "1f41835f-af7b-470b-8d60-e6b10332e142",
>> 60432384 blocks at 4096, type: ffs
>>
>> On Tue, Mar 25, 2025 at 1:23 AM Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote:
>> >
>> > On Tue, Mar 25, 2025 at 12:54:50AM +0500, Vitaly Shevtsov wrote:
>> > > I'm sorry, but it still doesn't work :)
>> > >
>> > > Do you run QEMU as root to be able to pass USB devices or as a non-root user?
>> > >
>> > > I use the following to run VM in QEMU:
>> > > qemu-system-x86_64 -m 4G -cpu host -smp 4 -M q35 -accel nvmm -usb
>> > > -device usb-host -drive file=vm.qcow2 -nic user,model=e1000 -rtc
>> > > base=localtime
>> > > And I get the this error:
>> > > qemu-system-x86_64: libusb_kernel_driver_active: -12 [NOT_SUPPORTED]
>> > >
>> > > Whichever bus/port I try, it always ends up with this error? What did I miss?
>> >
>> > What device do you try to pass though ? It needs to show up as ugen,
>> > and the user running qemu needs read/write access to /dev/ugen*
>> >
>> > I used something like:
>> >   -usb -device usb-host,bus=usb-bus.0,port=1,vendorid=0x1d50,productid=0x606f
>> >
>> > I think I also got the error -12, but that's not the problem.
>> >
>> > --
>> > Manuel Bouyer <bouyer%antioche.eu.org@localhost>
>> >      NetBSD: 26 ans d'experience feront toujours la difference
>> > --
>
>
>
> --
> Mario.