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This device is ridiculous. It has two MMIO BARs, BAR4 and BAR2. BAR4 hosts the MSI-X table, so oviously it would be too easy to access it directly, instead it creates a window register in BAR2 that, among other things, provides access to the MSI-X table. This means MSI-X doesn't work in the guest because the driver actually manages to program the physical table. When interrupt remapping is present, the device MSI will be blocked. The Linux driver doesn't make use of this window, so apparently it's not required to make use of MSI-X. This quirk makes the device work with the Windows driver that does use this window for MSI-X, but I certainly cannot recommend this device for assignment (the Windows 7 driver also constantly pokes PCI config space). Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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