powerpc/book3s64/pkeys: Mark all the pkeys above max pkey as reserved

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The hypervisor can return less than max allowed pkey (for ex: 31) instead
of 32. We should mark all the pkeys above max allowed as reserved so
that we avoid the allocation of the wrong pkey(for ex: key 31 in the above
case) by userspace.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709032946.881753-13-aneesh.kumar@linux.ibm.com

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Aneesh Kumar K.V 2020-07-09 08:59:35 +05:30 • committed by Michael Ellerman

parent 3c8ab47362

commit 3e4352aeb8

1 changed files with 3 additions and 2 deletions

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arch/powerpc/mm/book3s64/pkeys.c

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