Use IO api to access the io region Signed-off-by: wangyongrong <wangyongrong@xiaomi.com>
1. only support pci modern device; 2. need the pci controller support MSI/MSI-X; It has been verified based on virtio-rng and virtio-net. Signed-off-by: Yongrong Wang <wangyongrong@xiaomi.com> Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>