PIO/MMIO access from guest

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Hi all,

I would like to access the configuration registers of my passthrough
device from an unmodified guest under KVM via MMIO/PIO directly. Is
there any option to configure the guest in this way? I know that you can
do this with the ioports=[''] option in case of Xen, but I could not
find any such option until now for KVM. I also read that

[+] PIO can be passed directly via VMCS I/O bitmaps
[+] MMIO can be passed directly via mapping device BARs to guest
[+] Some PIO/MMIO accesses must be trapped (PCI config space)

Can I do this with some configurations without recompiling the kernel?

Thank you!
-gabor
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