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ppc/spapr, vfio: Turn off MSIX emulation for VFIO devices
This adds a possibility for the platform to tell VFIO not to emulate MSIX so MMIO memory regions do not get split into chunks in flatview and the entire page can be registered as a KVM memory slot and make direct MMIO access possible for the guest. This enables the entire MSIX BAR mapping to the guest for the pseries platform in order to achieve the maximum MMIO preformance for certain devices. Tested on: LSI Logic / Symbios Logic SAS3008 PCI-Express Fusion-MPT SAS-3 (rev 02) Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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