Public bug reported:
I try to pass-through nvidia 1060 6gb card, which is connected via
ExpressCard (EXP-GDC converter).
I can successfully run my virtual machine without pass-through, but when
I try to add the devices, qemu crashes.
The coredump contains:
Stack trace of thread 3289311:
#0 0x0
dmesg:
[0.00] microcode: microcode updated early to revision 0x21, date =
2019-02-13
[0.00] Linux version 5.8.6-1-MANJARO (builder@db927223e331) (gcc (GCC)
10.2.0, GNU ld (GNU Binutils) 2.35) #1 SMP PREEMPT Thu Sep 3 14:19:36 UTC 2020
[0.00] Command line: BOOT_IMAGE=/boot
Thank you Alex for answering me.
It seems, I've got it working, if I boot the host with the connected GPU from
the very beginning.
Previously, I tried hotplug and it crashes.
So previously I had:
1. enable the host
2. enable GPU
3. connect the cable
And this time I tried:
1. enable GP
What's more interesting, it doesn't crash if I hotplug GPU after it was boot
with it. So if I do
1. enable GPU
2. connect the cord
3. enable the host
4. run qemu (I'm not sure, if it's mandatory)
5. disable cord
6. disable GPU
7. enable GPU
8. enable cord
9. run qemu again
qe
Can confirm that it does not crash after applying that patch. I've added
the `fprintf` statement there:
if (vdev->bars[i].size) {
vfio_bar_quirk_setup(vdev, i);
} else {
fprintf(stderr, "%04x:%04x bars for %d are empty\n",
vdev->vendor_id, vdev->device_id, i)
I recorded both lspci - and lspci - for the following
connections:
- hotplug: when GPU is connected after the host was loaded
- fresh: when GPU is connected before the host was started
The main difference is the following:
1c1
< # hotplug
---
> # fresh
6c6
< Control: I/O+ Mem-
