Attention is currently required from: Patrick Rudolph.
By patching "src/soc/intel/common/block/smm/smihandler. […]
Alternatively, if it's not the "Synchronous SMI Status" bit, based on https://github.com/tianocore/edk2-platforms/blob/master/Silicon/Intel/KabylakeSiliconPkg/Pch/Spi/Smm/PchSpi.c#L245 calling https://github.com/tianocore/edk2-platforms/blob/master/Silicon/Intel/KabylakeSiliconPkg/Cpu/LibraryPrivate/PeiDxeSmmCpuCommonLib/CpuCommonLib.c#L389, there's an MSR to set.
I'll test these, write a patch and then maybe something can be merged?
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