Yep, only one, cause one tesla onboard, no any other video devices (maybe it is a problem)

[20:53 xcp ~]# lspci | grep -i nvidia
05:00.0 3D controller: NVIDIA Corporation TU104GL [Tesla T4] (rev ff)

[11:12 xcp ~]# dmesg | grep pciback
[    0.000000] Command line: root=LABEL=root-apezjy ro nolvm hpet=disable rd.auto console=hvc0 console=tty0 quiet vga=785 splash plymouth.ignore-serial-consoles xen-pciback.hide=(0000:05:00.0)
[    3.313418] Kernel command line: root=LABEL=root-apezjy ro nolvm hpet=disable rd.auto console=hvc0 console=tty0 quiet vga=785 splash plymouth.ignore-serial-consoles xen-pciback.hide=(0000:05:00.0)

[20:49 xcp ~]# lspci -s 0000:05:00.0 -v
05:00.0 3D controller: NVIDIA Corporation TU104GL [Tesla T4] (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: pciback

Seems to be that it was on boot in exception and now it is still in. But VM cannot get it...

Can someone please delete Solved sign? Cause problem still persists...
If any way to check what is in hide list?

@olivierlambert
After restart VM it began to show the same error, just like hide list is empty. If any way to check this hide list?

May 22 11:10:57 xcp kernel: [86647.738094] pciback 0000:05:00.0: timed out waiting for pending transaction; performing function level reset anyway
May 22 11:10:58 xcp kernel: [86648.986119] pciback 0000:05:00.0: not ready 1023ms after FLR; waiting
May 22 11:10:59 xcp kernel: [86650.042116] pciback 0000:05:00.0: not ready 2047ms after FLR; waiting
May 22 11:11:02 xcp kernel: [86652.346147] pciback 0000:05:00.0: not ready 4095ms after FLR; waiting
May 22 11:11:06 xcp kernel: [86656.698127] pciback 0000:05:00.0: not ready 8191ms after FLR; waiting
May 22 11:11:14 xcp kernel: [86665.146149] pciback 0000:05:00.0: not ready 16383ms after FLR; waiting
...
May 22 11:12:08 xcp kernel: [86718.394184] pciback 0000:05:00.0: not ready 65535ms after FLR; giving up

@olivierlambert
Yep, added excusion /opt/xensource/libexec/xen-cmdline --set-dom0 "xen-pciback.hide=(0000:05:00.0)" (https://docs.xcp-ng.org/compute/)
worked llike a sharm, thanks.

Hi! I have XCP-ng release 8.2.1 and tesla, only one videocard (becasue of x8da3 motherboard, we have now network card and tesla without any videocard for video-kvm access)

I checked all VMs, no one more have this gpu, only this VM and it does not start. Can you please tell how to solve this problem?

@AtaxyaNetwork
Thanks

Hi! deployed xen-orchestra and found out that ACL (to make some users to operate VMs) is not free, just to be clear, is it really not free, maybe i can find old version (3.7 had free acl as i remember) or download some communiti-edition?