[vfio-users] pass-through gpu to guest, but only once?!

[Karsten Elfenbein]

Hi,

could you post the hardware (cpu, board, gpu) and software versions
(qemu, kernel) you are using?
I'm have the same problem. Works the first time but not a second time.

Without a romfile I get the same error as you on the second try.
With the romfile on both tries the error is not displayed but the card
stays inactive.

https://www.redhat.com/archives/vfio-users/2015-September/msg00360.html

Karsten


2015-09-25 17:39 GMT+02:00 Fireball Firebomb <Firebomb at gmx.de>:
> Hi,
> i have a patched kernel version 4.1.6-1 with the ACS override patch and i915
> VGA arbiter patch and enabled them with the correct boot parameter.
>
> I can pass-through my Nvidia card to the virtual machine (using seabios),
> but only once. After that I get an error message:
> "qemu-system-x86_64: vfio-pci: Cannot read device rom at 0000:01:00.0
> Device option ROM contents are probably invalid (check dmesg).
> Skip option ROM probe with rombar=0, or load from file with romfile=".
> Until I reboot the host.
>
> Start script:
>
> vfio-bind 0000:01:00.0 0000:01:00.1
>
> qemu-system-x86_64 -enable-kvm -m 1024 -cpu host,kvm=off \
>
> -smp 4,sockets=1,cores=4,threads=1 \
>
> -device vfio-pci,host=01:00.0,x-vga=on -device vfio-pci,host=01:00.1 \
>
> -vga none
>
>
>
> vfio-bind:
>
> #!/bin/bash
>
> modprobe vfio-pci
>
> for dev in "$@"; do
>
> vendor=$(cat /sys/bus/pci/devices/$dev/vendor)
>
> device=$(cat /sys/bus/pci/devices/$dev/device)
>
> if [ -e /sys/bus/pci/devices/$dev/driver ]; then
>
> echo $dev > /sys/bus/pci/devices/$dev/driver/unbind
>
> fi
>
> echo $vendor $device > /sys/bus/pci/drivers/vfio-pci/new_id
>
> done
>
>
> Is there a fix for this problem?
>
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