[libvirt] [PATCH v3 2/3] Add PCI-Express root to ARM virt machine

Ján Tomko jtomko at redhat.com
Wed Jul 8 14:38:18 UTC 2015

On Tue, Jul 07, 2015 at 10:51:45AM +0300, Pavel Fedin wrote:
>  Hello!
> > Is there a way where we would make this configurable? Since the "virt"
> > machine types use the MMIO bus by default we should make the PCI bus
> > configurable since not everybody might want to add it actually.
>  What exactly do you mean? In qemu this is not configurable, it's just there. If you don't want to
> use it, just don't use it. I see no harm done by adding description of it to domain XML. If you just
> add a device, and don't specify <address type='pci'>, it will default to <address
> type='virtio-mmio'> as before. Nothing will change regarding old behavior and backwards
> compatibility.

The domain XML should contain the devices that are there, not just those
the user requested.

Backwards compatibility could break if older libvirt refused to start
the domain with a pcie root. From looking at the code, that does not
seem to be the case.

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