Re: [edk2-devel] tianocore/edk2-test patch contribution, Adding new EFI_RT_PROPERTIES_TABLE test case.

["Ard Biesheuvel via groups.io" <ardb=kernel.org@groups.io>]

On Thu, 5 Dec 2024 at 17:36, Hernandez, Ronal via groups.io
<ronal.hernandez1=hp.com@groups.io> wrote:
>
> Thank you for your feedback, Ard Biesheuvel.
>
> After reviewing the UEFI Specification our interpretation is that because it is now optional to support any of the EFI Runtime Services, the EFI_RT_PROPERTIES_TABLE needs to be published for the caller at runtime to know which runtime services have been implemented.
>

No. This table is optional.

Runtime services *MAY* return EFI_UNSUPPORTED at runtime if the
service in question cannot be supported after ExitBootServices().

If this does not apply to any runtime service, there is no requirement
to publish this table.


> What we are testing in this patch is whether the EFI_RT_PROPERTIES_TABLE has been installed and whether the RuntimeServicesSupported value has been populated to reflect which optional runtime services are implemented.
>

As I said, not doing so is permitted by the UEFI specl, and so it is
not an error.

> 34. If a platform cannot support calls defined in EFI_RUNTIME_SERVICES after
> ExitBootServices() is called, that platform is permitted to provide implementations of those
> runtime services that return EFI_UNSUPPORTED when invoked at runtime. On such systems, an
> EFI_RT_PROPERTIES_TABLE configuration table should be published describing which runtime services
> are supported at runtime

*On such systems* means systems where not all runtime services are
available at runtime. On systems where all runtime services are
available at runtime, there is no requirement to publish the table.


-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#120883): https://edk2.groups.io/g/devel/message/120883
Mute This Topic: https://groups.io/mt/109931209/7686176
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io]
-=-=-=-=-=-=-=-=-=-=-=-