[PATCH v2] powerpc: increase MIN RMA size for CAS negotiation

[Sourabh Jain]

Hello Maddy,

On 22/01/25 18:13, Madhavan Srinivasan wrote:
> On Fri, 06 Dec 2024 12:25:45 +0530, Avnish Chouhan wrote:
>> Change RMA size from 512 MB to 768 MB which will result
>> in more RMA at boot time for PowerPC. When PowerPC LPAR use/uses vTPM,
>> Secure Boot or FADump, the 512 MB RMA memory is not sufficient for
>> booting. With this 512 MB RMA, GRUB2 run out of memory and unable to
>> load the necessary. Sometimes even usage of CDROM which requires more
>> memory for installation along with the options mentioned above troubles
>> the boot memory and result in boot failures. Increasing the RMA size
>> will resolves multiple out of memory issues observed in PowerPC.
>>
>> [...]
> Applied to powerpc/next.
>
> [1/1] powerpc: increase MIN RMA size for CAS negotiation
>        https://git.kernel.org/powerpc/c/ae908b87b6bb32c170e9baf5858f2a7553cacc06

The above changes break the fadump additional parameter for the HASH MMU.
Here is the proposed fix:
https://lore.kernel.org/all/20250120173501.1147236-1-sourabhjain@linux.ibm.com/

The proposed fix ensures that the memory reserved for the additional 
parameter for
fadump on the HASH MMU does not overlap with GRUB.

Please share your opinion on the fixes.

Thanks,
Sourabh Jain