As an update to this, Apple have added some documentation.https://developer.apple.com/documentation/driverkit/debugging_and_testing_system_extensionsThis is now working for me.
gladsy
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Yes no problem starting the dext.I am working with PCIDriverKit, matching is working fine for me. In that case I need IOPCIPrimaryMatch in my plist, with matching entitlement under com.apple.developer.driverkit.transport.pci.
You can use the atomic operations from #include <stdatomic.h>.
We had to move to this from #include <atomic>, which was slightly annoying.