echo -n "1" > /sys/bus/pci/devices/0000:02:00.0/remove
Where 0000:02:00.0 is related to your pci device address which can
be obtained from the command
Was working on KVM vga passthrough and encountered problems with the graphics card nvidia Quadro 2000.
This was the error I got when attaching this particular VGA card:
libvirtError: internal error Unable to reset PCI device 0000:83:00.0: internal error Active 0000:83:00.1 devices on bus with 0000:83:00.0, not doing bus reset
After investigating I noticed that 0000:83:00.1 is a Sound compatible controller on the video card. Tried lots of stuff such as disable the drivers of that sound compatbile controller but without much success.
So in the end I decided I should just remove the pci device, but couldn't find how to do it, so just tried some stuff and this is what I came up with. I have no idea if it will break your system or what it does exactly, but after removing the sound compatbile controller I was able to pass the nvidia Quadro 2000 card to my virtual machine :)
Here is the code to remove the pci device using a simple linux command:
lspci -k | grep NVID -C3 00:83.0 VGA compatible controller: Nvidia Quadro 2000.... (Dont have the card anymore) 00:83.1 Sound device: Nvidia Quadro Audo captabiel balbalbal. 2000 GP echo -n "1" > /sys/bus/pci/devices/0000:02:00.1/remove