[libvirt] ARMv7 guest PCI support broken in 3.0.0 onwards

[Andrea Bolognani]

On Fri, 2017-02-17 at 15:56 +0100, Andrea Bolognani wrote:
> libvirt is picking GICv3 here because QEMU reports it as a
> viable emulated GIC; however, as I understand it the
> emulated GICv3 doesn't have MSI support, and without that
> PCIe can't work. If you manually switch to GICv2 you should
> be able to run the guest succesfully.
> 
> We should find a way to detect whether the interrupt
> controller will support PCIe, and fall back to using
> virtio-mmio when it doesn't. Eric, any ideas about how we
> could achieve that?

Actually, we will probably want to do the opposite, eg. pick
GICv2 over GICv3 if the latter doesn't allow us to use PCIe.

-- 
Andrea Bolognani / Red Hat / Virtualization