powerpc: Handle exceptions caused by pkey violation

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Handle Data and  Instruction exceptions caused by memory
protection-key.

The CPU will detect the key fault if the HPTE is already
programmed with the key.

However if the HPTE is not  hashed, a key fault will not
be detected by the hardware. The software will detect
pkey violation in such a case.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

...

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Ram Pai 2018-01-18 17:50:40 -08:00 • committed by Michael Ellerman

parent 1137573acf

commit e6c2a4797e

3 changed files with 23 additions and 2 deletions

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1

arch/powerpc/include/asm/reg.h

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2

arch/powerpc/kernel/exceptions-64s.S

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22

arch/powerpc/mm/fault.c

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