Re: [PATCH] powerpc/pseries/svm: Remove unwanted check for shared_lppaca_size

[Thiago Jung Bauermann]

Satheesh Rajendran <sathnaga@xxxxxxxxxxxxxxxxxx> writes:

> Early secure guest boot hits the below crash while booting with
> vcpus numbers aligned with page boundary for PAGE size of 64k
> and LPPACA size of 1k i.e 64, 128 etc, due to the BUG_ON assert
> for shared_lppaca_total_size equal to shared_lppaca_size,
>
>  [    0.000000] Partition configured for 64 cpus.
>  [    0.000000] CPU maps initialized for 1 thread per core
>  [    0.000000] ------------[ cut here ]------------
>  [    0.000000] kernel BUG at arch/powerpc/kernel/paca.c:89!
>  [    0.000000] Oops: Exception in kernel mode, sig: 5 [#1]
>  [    0.000000] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
>
> which is not necessary, let's remove it.
>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
> Cc: Ram Pai <linuxram@xxxxxxxxxx>
> Cc: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
> Cc: Laurent Dufour <ldufour@xxxxxxxxxxxxx>
> Signed-off-by: Satheesh Rajendran <sathnaga@xxxxxxxxxxxxxxxxxx>
> ---
>  arch/powerpc/kernel/paca.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Thanks for fixing this bug! I would only add:

Fixes: bd104e6db6f0 ("powerpc/pseries/svm: Use shared memory for LPPACA structures")

In any case:

Reviewed-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>

-- 
Thiago Jung Bauermann
IBM Linux Technology Center