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Fix Sparse warning
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
qemu/pci: MSI-X support functions
Add functions implementing MSI-X support. First user will be virtio-pci.Note that platform must set a flag to declare MSI supported: thisis a safety measure to avoid breaking platforms which should supportMSI-X but currently lack this in the interrupt controller emulation....