[libvirt] patch for pci passthrough

[Jason Krieg]

Hi,

This patch adds support for the -pcidevice host=bus:dev.func
added in kvm-79

I used the structure as already defined in src/domain_conf.h

so analog to usb one now can add pci devices

as example:

lspci:  06:02.0 Network controller: Eicon Networks Corporation Diva 
Server 2FX (rev 01)


<hostdev mode='subsystem' type='pci'>
    <source>
        <address bus="0x06" slot="0x02" function="0x0"/>
    </source>
</hostdev>


values are hex so for bus: 0 to ff, slot: 0 to 1f and function: 0 to 7

Hope this patch is useful it applies to libvirt-0.5.1 and cvs checkout
from today (with some hunks)

Regards Jason

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