Tesla xenctrlext.unix_error Device or resource is busy

olivierlambert

The GPU is probably not hidden to the Dom0

kuznetcoff777

@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.

olivierlambert

Note that PCI passthrough will be entirely exposed in XO with XCP-ng 8.3, no need for the CLI anymore

kuznetcoff777

@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

Maybe this will ring a bell to anyone around here?

kuznetcoff777

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

olivierlambert

Put back as unresolved

kuznetcoff777

[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...

olivierlambert

You are only hidding one PCI address. In your dom0, with a lspci command, double check if you have other Nvidia references

kuznetcoff777

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)