[Xen-users] Log/dump/trace HW access using PCI passthrough

[Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>]

Hello,
I'm trying to reverse-engineer a PCI sound card driver.
The card is assigned to a Xen HVM guest (Windows) using PCI passthrough, the 
driver is installed and works. I had to compile Xen 4.2.3 from source as PCI 
passthrough is broken in 4.1.4-3+deb7u1 present in Debian Wheezy.

Now I need to capture/log/dump/trace PIO and/or MMIO accesses that the driver 
does to the assigned device.
Found tools/qemu-xen-traditional/hw/pass-through.c file that seems to be 
responsible for pass-through but I'm unable to figure out if this is even 
possible at all.

Or should I use qemu-kvm instead? It was possible some time ago:
http://www.coreboot.org/Reverse_Engineering_PCI_Drivers
but it's outdated and that code is not present in qemu anymore.

-- 
Ondrej Zary

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