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Re: [PATCH v4 1/7] docs/arm: Document Xen booting protocol on Armv8-R
- To: Julien Grall <julien@xxxxxxx>
- From: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- Date: Tue, 6 May 2025 12:40:41 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Ayan Kumar Halder <ayankuma@xxxxxxx>
- Delivery-date: Tue, 06 May 2025 12:41:39 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-index: AQHbuRpmN9lJogKQoUiVWa6WakCsQrPFhjEAgAALLQCAAAF7AIAAAvWA
- Thread-topic: [PATCH v4 1/7] docs/arm: Document Xen booting protocol on Armv8-R
Hi Julien,
>> Just to be sure to be on the same page, are you suggesting these changes on
>> the original file?
>
> Yes with one tweak.
>
> > > diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt
>> index 21ae74837dcc..c00c651805d7 100644
>> --- a/docs/misc/arm/booting.txt
>> +++ b/docs/misc/arm/booting.txt
>> @@ -58,10 +58,14 @@ Firmware/bootloader requirements
>> Xen relies on some settings the firmware has to configure in EL3 before
>> starting Xen.
>
> I think you want to update this sentence to remove the reference to EL3. Even
> on A-profile EL3 is not mandatory (I vaguely remember one of the platform I
> worked on had no EL3).
>
>> -* Xen must be entered in NS EL2 mode
>> +* Xen must be entered in:
>> + * Non-Secure EL2 mode for Armv8-A Arm64 and Arm32, Armv8-R Arm32.
>> + * Secure EL2 mode for Armv8-R Arm64.
>> * The bit SCR_EL3.HCE (resp. SCR.HCE for 32-bit ARM) must be set to 1.
>
> And then here: "When EL3 is supported, ...". This would also cover the
> R-profile change.
>
Thanks for the clarification, @Michal, @Ayan, are you ok if I retain your R-by
with these changes or
should I drop it?
> Cheers,
>
>> +* Xen must be entered with MMU/MPU off and data cache disabled
>> (SCTLR_EL2.M bit
>> + and SCTLR_EL2.C set to 0).
>> [1] linux/Documentation/arm/booting.rst
>> Latest version:
>> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arch/arm/booting.rst
Cheers,
Luca
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