[PATCH v4 13/25] powernv/fadump: support copying multiple kernel memory regions

[Hari Bathini]

On 13/08/19 8:33 PM, Mahesh J Salgaonkar wrote:
> On 2019-07-16 17:03:30 Tue, Hari Bathini wrote:
>> Firmware uses 32-bit field for region size while copying/backing-up
>> memory during MPIPL. So, the maximum copy size for a region would
>> be a page less than 4GB (aligned to pagesize) but FADump capture
>> kernel usually needs more memory than that to be preserved to avoid
>> running into out of memory errors.
>>
>> So, request firmware to copy multiple kernel memory regions instead
>> of just one (which worked fine for pseries as 64-bit field was used
>> for size there). With support to copy multiple kernel memory regions,
>> also handle holes in the memory area to be preserved. Support as many
>> as 128 kernel memory regions. This allows having an adequate FADump
>> capture kernel size for different scenarios.
> 
> Can you split this patch into 2 ? One for handling holes in boot memory
> and other for handling 4Gb region size ? So that it will be easy to
> review changes.

Sure. Let me split and have the patch that handles holes in boot memory
as the last patch in the series.