Re: [PATCH v5 13/16] powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX

christophe leroy
2019-06-16T08:21:21Z

Le 15/06/2019 à 14:28, Andreas Schwab a écrit :
> On Feb 21 2019, Christophe Leroy <christophe.leroy@c-s.fr> wrote:
>
>> diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
>> index a000768a5cc9..6e56a6240bfa 100644
>> --- a/arch/powerpc/mm/pgtable_32.c
>> +++ b/arch/powerpc/mm/pgtable_32.c
>> @@ -353,7 +353,10 @@ void mark_initmem_nx(void)
>> unsigned long numpages = PFN_UP((unsigned long)_einittext) -
>> PFN_DOWN((unsigned long)_sinittext);
>>
>> - change_page_attr(page, numpages, PAGE_KERNEL);
>> + if (v_block_mapped((unsigned long)_stext) + 1)
>
> That is always true.
>

Did you boot with 'nobats' kernel parameter ?

If not, that's normal to be true, it means that memory is mapped with BATs.

When you boot with 'nobats' parameter, this should return false.

Christophe

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