Re: [PATCH v5 15/31] powernv/fadump: support copying multiple kernel boot memory regions

2019-09-04 Thread Michael Ellerman
Hari Bathini writes: > On 04/09/19 5:00 PM, Michael Ellerman wrote: >> Hari Bathini writes: >>> Firmware uses 32-bit field for region size while copying/backing-up >> >> Which firmware exactly is imposing that limit? > > I think the MDST/MDRT tables in the f/w. Vasant, which component is that? >

Re: [PATCH v5 15/31] powernv/fadump: support copying multiple kernel boot memory regions

2019-09-04 Thread Hari Bathini
On 04/09/19 5:00 PM, Michael Ellerman wrote: > Hari Bathini writes: >> Firmware uses 32-bit field for region size while copying/backing-up > > Which firmware exactly is imposing that limit? I think the MDST/MDRT tables in the f/w. Vasant, which component is that? >> +/* >> + * Firmwa

Re: [PATCH v5 15/31] powernv/fadump: support copying multiple kernel boot memory regions

2019-09-04 Thread Michael Ellerman
Hari Bathini writes: > Firmware uses 32-bit field for region size while copying/backing-up Which firmware exactly is imposing that limit? > 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

[PATCH v5 15/31] powernv/fadump: support copying multiple kernel boot memory regions

2019-08-20 Thread Hari Bathini
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 error