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From: "Ard Biesheuvel" <ardb@kernel.org>
Date: Mon, 3 Oct 2022 13:23:32 +0200
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Subject: Re: [edk2-devel] [PATCH v5 2/7] MdePkg: Introduce ExitBootServicesCallbackProtocol
To: Dionna Amalie Glaze <dionnaglaze@google.com>
Cc: "Ni, Ray" <ray.ni@intel.com>, "devel@edk2.groups.io" <devel@edk2.groups.io>, 
	Gerd Hoffmann <kraxel@redhat.com>, "Xu, Min M" <min.m.xu@intel.com>, 
	James Bottomley <jejb@linux.ibm.com>, "Yao, Jiewen" <jiewen.yao@intel.com>, 
	Tom Lendacky <thomas.lendacky@amd.com>, Andrew Fish <afish@apple.com>, 
	"Kinney, Michael D" <michael.d.kinney@intel.com>
Content-Type: text/plain; charset="UTF-8"

On Mon, 3 Oct 2022 at 03:16, Dionna Amalie Glaze <dionnaglaze@google.com> wrote:
>
> >
> > Is it defined by UEFI Spec?
> >
>
> It is not. This is Ard's suggested solution
> https://patchew.org/EDK2/20220928153323.2583389-1-dionnaglaze@google.com/20220928153323.2583389-5-dionnaglaze@google.com/#CAMj1kXFwbU9oiULUFXSrqhag1Pf+YU2dL4JbUZ2LO0k9uUEqRg@mail.gmail.com
>

It is not in the spec, which is why we called it
gEdkiiExitBootServicesCallbackProtocolGuid

What Ray is getting to (I think) is that that means that it should be
defined in MdeModulePkg not MdePkg.