enable hardware performance counters in WSL2

fix vmwp.bat

REM open cmd.exe as admin to run this

REM Creates a patched vmwp.exe replacing these bytes:
REM  0F B6 43 64 41 89 47 64 0F B6 43 65 41 89 47 68 0F B6 43 66 41 89 47 6C 0F B6 43 67 41 89 47 70
REM  41 C7 47 64 01 00 00 00 41 C7 47 68 01 00 00 00 41 C7 47 6C 01 00 00 00 41 C7 47 70 01 00 00 00
REM Enables PMU, LBR, PEBS, IPT

cd %TEMP%
copy %windir%\system32\vmwp.exe .

@REM version with Intel Processor Trace
wsl bash -c "sed -i 's#\x0F\xB6\x43\x64\x41\x89\x47\x64\x0F\xB6\x43\x65\x41\x89\x47\x68\x0F\xB6\x43\x66\x41\x89\x47\x6C\x0F\xB6\x43\x67\x41\x89\x47\x70#\x41\xC7\x47\x64\x01\x00\x00\x00\x41\xC7\x47\x68\x01\x00\x00\x00\x41\xC7\x47\x6C\x01\x00\x00\x00\x41\xC7\x47\x70\x01\x00\x00\x00#g' vmwp.exe"

@REM version without Intel Processor Trace
@REM wsl bash -c "sed -i 's#\x0F\xB6\x43\x64\x41\x89\x47\x64\x0F\xB6\x43\x65\x41\x89\x47\x68\x0F\xB6\x43\x66\x41\x89\x47\x6C#\x41\xC7\x47\x64\x01\x00\x00\x00\x41\xC7\x47\x68\x01\x00\x00\x00\x41\xC7\x47\x6C\x01\x00\x00\x00#g' vmwp.exe"

wsl --shutdown
@REM taskkill /F /IM vmwp.exe
@REM taskkill /F /IM vmmem

takeown /F %windir%\system32\vmwp.exe /A
icacls %windir%\system32\vmwp.exe /grant Administrators:F
icacls %windir%\system32\vmwp.exe /grant Administratoren:F

move /Y %windir%\system32\vmwp.exe %windir%\system32\vmwp.exe.bak
move /Y vmwp.exe %windir%\system32

wsl bash -c "echo 'Patch successfully applied'"

No the code changed.

I was able to find out that the script essentially patches a part of the ProcessorManager::InitProperties function, but I am not able to understand how one can find the right object offsets to update.

Just putting it here for reference if anyone else ends up with the same questions I had.

I found that ProcessorManager has getter functions which I can use to find the offsets that have to be set to 1.

• ProcessorManager::IsEnablePerfmonIpt
• ProcessorManager::IsEnablePerfmonPmu
• ProcessorManager::IsEnablePerfmonLbr
• ProcessorManager::IsEnablePerfmonPebs

This should hopefully be of help if I need to edit the patch in the future.