Still required that EFI_MEMORY_XP and EFI_MEMORY_RO must not both be cleared?

[Heiner Kallweit <hkallweit1@xxxxxxxxx>]

I'm one of the people seeing the following warning:

efi: memattr: Entry attributes invalid: RO and XP bits both cleared
efi: memattr: ! 0x000000090000-0x000000090fff [Runtime Code|RUN|  |  |  |  |  |  |  |  |   |  |  |  |  ]

Out of curiosity I checked UEFI spec 2.9. On p.108 there's table 4.1:

                                                   EFI_MEMORY_RO EFI_MEMORY_XP EFI_MEMORY_RUNTIME
No memory access protection is possible for Entry  0             0             1
Write-protected Code                               1             0             1
Read/Write Data                                    0             1             1
Read-only Data                                     1             1             1

So it seems to be valid that both attributes are cleared.
Also in the surrounding text I didn't find a hint mandating
that at least one the attributes has to be set.