On 02/20/2010 01:58 AM, Vikram Ambrose wrote:
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?
For config-space accesses, hook assigned_dev_pci_{read,write}_config().
For mmio, hook slow_bar_{read,write}*(), and hack
assigned_dev_register_regions() to select the slow path (otherwise kvm
will let the guest write directly to the device). For pio, hook
assigned_dev_ioport_{read,write)*().
--
error compiling committee.c: too many arguments to function
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