[Qemu-discuss] Remove unnecessary PCI Controllers

[qemu user]

Hello.

I run on Linux x86_64 QEMU/KVM, in which I run the Linux guest OS, also 
x86_64.
QEMU emulates one of the variants of a standard PC (-machine type=pc).
Question: can I remove unnecessary controllers on the PCI bus on the 
guest OS side, for example, "ISA bridge: Intel Corporation 82371SB PIIX3 
ISA [Natoma / Triton II]"?

Thank.