How gpu requests are trapped by kvmgt ?

[Adel Belkhiri]

Hi everybody,

I have a question about the implementation of KVMGT. According to the
documentation, the virtual machine, may send some requests to the gpu
directly (Pass-through) and forward some other requests to the KVMGT
module.

I read the code of KVMGT but i didn't understand how requests are being
sent directly to the gpu ? and who decide which request to be directly sent
to the gpu or to be trapped by kvmgt ? Is it the graphics card driver of
the VM (i915) or KVMGT ?

Thanks a lot for your help.
Yours.
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