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- Always enable the HyperTransport MSI mapping window for HyperTransport to PCI bridges (these show up as HyperTransport slave devices). The mapping windows in PCI-PCI bridges are enabled by existing code in the PCI-PCI bridge driver as MSI requests propagate up the device tree, but Host-PCI bridges don't really show up in that tree. - If the PCI device at domain 0 bus 0 slot 0 function 0 is not a HyperTransport device, then blacklist MSI on any other HT devices in the system. Linux has a similar quirk. PR: kern/155442 Tested by: Zack Dannar zdannar of gmail MFC after: 1 week