[SRU][N][PATCH 0/1] powerpc/64s/radix/kfence: map __kfence_pool at page granularity (LP: 2060039)

[patricia.domingues at canonical.com]

BugLink: https://bugs.launchpad.net/bugs/2060039

SRU Justification:

[Impact]
 * L1 host hangs when triggering FADump with recommended crash

[Fix]
 * 353d7a84c214f184d5a6b62acdec8b4424159b7c 353d7a84c214 "powerpc/64s/radix/kfence: map __kfence_pool at page granularity"

[Test Case]
 * Have a Ubuntu Server 24.04 LTS installation on ppc64el.
 * Enable FADump with 1GB: fadump=on crashkernel=1024M
 * A kernel panic will happen when dump got triggered

[Regression Potential]
* There is a certain risk of a regression, but it is mapping only the memory
  allocated for KFENCE pool at page granularity, reducing memory consumption
  when KFENCE is used. 

* On top the commit is already upstream reviewed and accepted.

* The modifications were done and tested by IBM.

* The fadump feature is supported only on IBM POWER systems. 

[Other]
* The fix/commit got upstream accepted with kernel v6.11-rc4,
  hence Oracular (with a planned kernel of 6.11) is not affected.

Hari Bathini (1):
  powerpc/64s/radix/kfence: map __kfence_pool at page granularity

 arch/powerpc/include/asm/kfence.h        | 11 +++-
 arch/powerpc/mm/book3s64/radix_pgtable.c | 84 ++++++++++++++++++++++--
 arch/powerpc/mm/init-common.c            |  3 +
 3 files changed, 93 insertions(+), 5 deletions(-)

-- 
2.25.1