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From: Michael Zimmermann <sigmaepsilon92@gmail.com>
Date: Mon, 20 Mar 2017 11:32:58 +0100
Message-ID: <CAN9vWDLTEQt7hrkKZqMUWifjTR8=fZ+e2_vEGOY9npKDW-L+jQ@mail.gmail.com>
To: edk2-devel-01 <edk2-devel@lists.01.org>, Laszlo Ersek <lersek@redhat.com>, 
 Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: SetMemorySpaceAttributes with EFI_MEMORY_XP
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Hi,

I didn't test ArmVirtQemuKernel but I'm trying to use some of the code
for another platform.
So does this call ever succeed with PcdDxeNxMemoryProtectionPolicy
being enabled?
https://github.com/tianocore/edk2/blob/76874be3d411bf8daac051718e20932e0bf97d70/ArmVirtPkg/HighMemDxe/HighMemDxe.c#L95
Status = gDS->SetMemorySpaceAttributes (CurBase, CurSize, Attributes);

Neither the memory that was added by this Dxe nor the one added
automatically by GCD has the EFI_MEMORY_XP capability which causes
SetMemorySpaceAttributes to return EFI_UNSUPPORTED.

Thanks
Michael