msi/msix: added API to set MSI message address and data
Added (msi|msix)_set_message() function for whoever might want to use them. Currently msi_notify()/msix_notify() write to these vectors to signal the guest about an interrupt so the correct values have to written there by the guest or QEMU. For example, POWER guest never initializes MSI/MSIX vectors, instead it uses RTAS hypercalls. So in order to support MSIX for virtio-pci on POWER we have to initialize MSI/MSIX message from QEMU. Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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