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 lspci

Related story:
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


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