Re: [PATCH v3 00/23] vfio-user client

["Cédric Le Goater" <clg@redhat.com>]

Hello,

On 6/21/25 14:22, John Levon wrote:
> On Fri, Jun 20, 2025 at 10:32:10AM +0200, Cédric Le Goater wrote:
> 
>> Before merging, I would like to be able to experiment a minimum.
>>
>> Does a dummy device (server side) implementation exist ? and a
>> GH repo I could pull the code from.
>>
>> John,
>>
>> How do you test ?
> 
> I use these scripts for smoke-testing:
> 
> https://github.com/jlevon/grot/blob/master/tests/vfio-user/run.sh
> is easiest - you just need to compile libvfio-user and qemu
> and you should be good if you have a suitable Linux image.

PCI enumeration work but the kernel module won't load on ubuntu 24.04
and 25.04 :

root@ubuntu:~# lspci -s 00:0d.0 -k -vv
00:0d.0 Non-VGA unclassified device: ACCES I/O Products, Inc. PCI-IDIO-16 Isolated Digital Input / FET Output Card
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 21
	Region 2: I/O ports at 6000 [size=256]
	Kernel modules: gpio_pci_idio_16

root@ubuntu:~# dmesg | grep 0000:00:0d.0
[    0.381550] pci 0000:00:0d.0: [494f:0dc8] type 00 class 0x000000 conventional PCI endpoint
[    0.382696] pci 0000:00:0d.0: BAR 2 [io  0x6000-0x60ff]
[    4.017654] pci-idio-16 0000:00:0d.0: error -EINVAL: Unable to initialize register map
[    4.027063] pci-idio-16 0000:00:0d.0: probe with driver pci-idio-16 failed with error -22

Any idea why ?

> 
> See https://github.com/nutanix/libvfio-user/blob/master/docs/qemu.md
> if you need an image that has the relevant kernel module, and for some basic
> testing instructions.
> 
> https://github.com/jlevon/grot/blob/master/tests/vfio-user/spdk-run.sh
> is a more complete test - covers mmaps both ways etc. You can test this by
> interacting with the vNVMe device inside your VM.
> 
> See https://github.com/nutanix/libvfio-user/blob/master/docs/spdk.md
I didn't try SPDK yet.

Thanks,

C.