Update build process to use kmutil rather than kextload, and add some debugging commands

Author: nealsid

doc/MAC_HOWTO.txt

@@ -51,3 +51,14 @@ PCM Execution
 Now you can run ./pcm utility.
 See description of other built utilities in LINUX_HOWTO.txt
 
+Logging/Debugging
+----------------------
+
+Sometimes you will get errors while running utilities that may come from the kernel, and you can use something like this DTrace script to correlate it with user-land behavior:
+
+$ sudo dtrace -n 'fbt:mach_kernel:_ZN*IOUser*:return /execname == "pcm"/ { @hgram[probefunc, arg1, ustack(20)] = count(); }' -c ./pcm
+
+Various commands that can help diagnose errors:
+
+$ kmutil log stream
+$ kmutil inspect -b com.intel.driver.PcmMsr

src/MacMSRDriver/PcmMsr/CMakeLists.txt

@@ -41,4 +41,4 @@ target_link_libraries(PcmMsrDriver PRIVATE ${IOKIT_LIBRARY}
 # PcmMsrDriver.kext is built here and located in 'build/bin'
 set(LIB_EXT_PATH "/Library/Extensions")
 install(TARGETS PcmMsrDriver DESTINATION "${LIB_EXT_PATH}/")
-install(CODE "execute_process(COMMAND kextload ${LIB_EXT_PATH}/PcmMsrDriver.kext)")
+install(CODE "execute_process(COMMAND kmutil load ${LIB_EXT_PATH}/PcmMsrDriver.kext)")