[libvirt-users] avoiding PCI bus 8 / using PCI function / virt-install

[b f31415]

I’m using virt-install to spin up VMs.  At times I have a need to spin up
VMs which have 100s of interfaces.  I ran into the PCI issue mentioned in
this previous thread based on how virt-install assigns PCI addresses to
interfaces:



https://www.redhat.com/archives/libvirt-users/2018-December/msg00064.html



Using the info mention there I was able to part hand / part sw re-write an
XML where I would remove PCI bus references above the value of 8 and
re-address the per interface PCI info to use the function field (I don’t
need hot pluggable).



But the process I’ve built is brittle.


Wondering what options i might have to better deal with this PCI issue.



Is there a way to tell virt-install, when building the info it passes to
qemu, to use the function field during the PCI assignment process so as to
support many more interfaces before hitting the PCI bus == 8 issue?



If not, is there a way with one of the virt command line tools to create
the XML (with the PCI addresses specified) so that I can process that XML
and re-write the PCI addressing values?  Right now the only way I’ve been
able to get that detailed XML file is to 1) virt-install and let the VM
begin the boot process and then do a 2) virsh dumpxml and then 3) virsh
destroy/undefine that VM, 4) modify the XML and then 5) virsh create
./modified.xml.  Is there a cleaner way to do this?


Thanks
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