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

[Michael Ellerman]

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

cheers