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Some PCI devices can not accept DWORD write to the MSI-X Table though PCI Spec allows it: PCI Spec 3.0 6.8.3.2 MSI-X Configuration: Specifically, software is always permitted to fill in the Message Address and Message Upper Address fields with a single QWORD write. Tracked-On: #1568 Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com>