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From: Thomas Monjalon <thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v4 17/26] virtio: Use port IO to get PCI
	resource.
Date: Wed, 11 Feb 2015 15:16:14 +0100
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2015-02-11 05:50, Stephen Hemminger:
> But driver needs to tell application via driver flags

I think it's done:
> +	pci_dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
> +	pci_drv->drv_flags |= RTE_PCI_DRV_INTR_LSC;

In my understanding, Changchun chose to use ioports as a fallback if uio
is not available. Seems OK.