pci-passthrough logging

[Vikram Ambrose <vambrose@gmx.com>]

Hello,

I'm new to kvm and I'm trying to log pci config and mmio read/writes for 
a particular pci  (pci-e to be precise) device that I've passthrough to 
qemu-kvm (dma=none).

I put a printk into kvm_iodevice_read/write() in linux/virt/kvm/iodev.h 
but the log seems to get corrupted when the action picks up.

I looked at qemu-kvm/hw/pci_host.c and found 
pci_host_data_write/read_mmio[]. But I don't know where those are 
implemented, nor exactly what they do for that matter.

I appologise for the n00b nature of my problem, but there isnt any 
documentation on the pci-passthrough architecture in 
linux/Documentation/kvm or in qemu-kvm.

Does anyone know where/how to log pci-passthrough accesses?

thanks,

Vik.
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