[PATCH v4 16/20] arm64: enable Permission Indirection Extension (PIE)

[Trilok Soni]

On 6/20/2023 1:35 PM, Marc Zyngier wrote:
> On 2023-06-20 20:16, Neil Armstrong wrote:
>> Hi Joey,
>>
>> On 06/06/2023 16:58, Joey Gouly wrote:
>>> Now that the necessary changes have been made, set the Permission 
>>> Indirection
>>> registers and enable the Permission Indirection Extension.
>>>
>>> Signed-off-by: Joey Gouly <joey.gouly at arm.com>
>>> Cc: Catalin Marinas <catalin.marinas at arm.com>
>>> Cc: Will Deacon <will at kernel.org>
>>> Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>
>>
>> This patch on linux-next causes a great amount of:
>>
>> X     xxx.xxxxxx Emulated RAZ for ID register: ISS 0x36002f
>>
>> messages printed by the system firmware on the Qualcomm SM8550 SoC,
>> and the platform is barely usable.
> 
> As others have said on this thread, this is a firmware bug.
> Not a lot we can do about that, unfortunately, apart from hiding
> the new feature behind a config option that you'd disable on this
> platform.
> 
> Alternatively, disabling idle management on this machine should
> reduce the screaming greatly.

I have informed Carl about the Gunyah messaging, I have also added him 
into this thread.

---Trilok Soni