[PATCH] powerpc/mm/hash: Improve address limit checks

[Michael Ellerman]

Michael Ellerman <patch-notifications at ellerman.id.au> writes:
> On Thu, 2019-05-16 at 11:50:54 UTC, "Aneesh Kumar K.V" wrote:
>> Different parts of the code do the limit check by ignoring the top nibble
>> of EA. ie. we do checks like
>> 
>> 	if ((ea & EA_MASK)  >= H_PGTABLE_RANGE)
>> 	   	error
>> 
>> This patch makes sure we don't insert SLB entries for addresses whose top nibble
>> doesn't match the ignored bits.
>> 
>> With an address like 0x4000000008000000, we can result in wrong slb entries like
>> 
>> 13 4000000008000000 400ea1b217000510   1T ESID=   400000 VSID=   ea1b217000 LLP:110
>> 
>> without this patch we will map that EA with LINEAR_MAP_REGION_ID and further
>> those addr limit check will return false.
>> 
>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
>
> Applied to powerpc fixes, thanks.
>
> https://git.kernel.org/powerpc/c/c179976cf4cbd2e65f29741d5bc07ccf

Actually this patch was superseeded. This should have been a reply to:

  https://lore.kernel.org/linuxppc-dev/20190517132958.22299-1-mpe@ellerman.id.au/

cheers