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For pre-launched VMs MSI/MSI-x configuration writes are not intercepted by ACRN. It is pass-thru and interrupts land in ACRN and the guest vector is injected into the VM's vLAPIC. With this patch, ACRN intercepts MSI/MSI-x config writes and take the code path to remap interrupt vector/APIC ID as it does for SOS/UOS. Tracked-On: #2879 Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com> Reviewed-by: Eddie Dong <eddie.dong@intel.com>