[libvirt] separate module for pci passthrough device assigning and in-use tracking

[Chunyan Liu]

Hi, Shradha, Laine

Some time before I found you had a thread discussing in-use tracking for
network and pci-passthrough devices[1], it mentioned code for tracking pci
device allocation should be better as a separate module rather than a part
of qemu, so that it could solve data sharing problem between hypervisor
drivers and network driver.

And after that, we wanted to add pci passthrough support to libxl
driver[2], which turned to be the same problem, data sharing between libxl
driver and other drivers, and there were code duplication between libxl and
qemu driver. Laine suggested again to write code in common library as a
separate module.

Now I wonder if there is anyone already worked and pushed this thing to
some status? If not, I am willing to try it.

Thanks,
Chunyan
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