> So if you wish to have more than 14 PCIe slots in your VM, you’ll have to use QEMU directly.
No need, libvirt can pass arbitrary options to QEMU.
No need, libvirt can pass arbitrary options to QEMU.
These days, instead of crafting a custom script to launch QEMU/KVM for PCI mapping, it's just a few clicks in virt-manager. Note that the first time you launch a VM with a mapped PCI device, the launch will often fail with an error, but it will work on a subsequent retry and thereafter.
Also, I've tinkered with lots of VMs over the past 15 years and I've NEVER had a need for more than 14 buses. Hopefully I never will.
Not sure it will work though: I need to add an option to a `pcie-root-port` command-line argument managed by libvirt.
I can try skipping creating `pcie-root-port`s by libvirt completely, and add them manually using options passthrough, but I'm not sure the rest of libvirt won't throw a fit when it finds other devices that refer to these (unknown to libvirt) PCIe slots.