Communicating between user space and kernel space in Windows

Note: you may need to run bcdedit /set testsigning on in an Administrator Command Prompt and then restart your virtual machine if you haven't done so already.

Open x64 Native Tools Command Prompt for VS 2019 and run

cl testdriver.c "C:\Program Files (x86)\Windows Kits\10\Lib\10.0.19041.0\km\x64\ntoskrnl.lib" /I "C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\km" /link /subsystem:native /driver:wdm -entry:DriverEntry

ren testdriver.exe testdriver.sys

to compile the driver and rename the file to have the expected file extension. Run make in MSYS2 UCRT64 to build the user space code. Then open an Administrator Command Prompt and run

sc create testdriver type= kernel binPath= C:\msys64\home\chris\test-deviceioctl\testdriver.sys
sc start testdriver

to start the driver (you can use driverquery to check that it's running). You can see kernel debug output in DebugView (make sure to enable verbose kernel output). When finished run

sc stop testdriver

to stop the driver.