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

[Stefan Bader]

On 28.08.24 20:46, patricia.domingues at canonical.com wrote:
> 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(-)
> 

Applied to noble:linux/master-next. Thanks.

-Stefan

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