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powerpc/kexec: Fix radix to hash kexec due to IAMR/AMOR 

This patch fixes a crash seen while doing a kexec from radix mode to
hash mode. Key 0 is special in hash and used in the RPN by default, we
set the key values to 0 today. In radix mode key 0 is used to control
supervisor<->user access. In hash key 0 is used by default, so the
first instruction after the switch causes a crash on kexec.

Commit 3b10d0095a ("powerpc/mm/radix: Prevent kernel execution of
user space") introduced the setting of IAMR and AMOR values to prevent
execution of user mode instructions from supervisor mode. We need to
clean up these SPR's on kexec.

Fixes: 3b10d0095a ("powerpc/mm/radix: Prevent kernel execution of user space")
Cc: stable@vger.kernel.org # v4.10+
Reported-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Balbir Singh 2017-06-29 21:57:26 +10:00 committed by Michael Ellerman
parent af3c8d9850
commit 1e2a516e89
1 changed files with 12 additions and 0 deletions
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12
arch/powerpc/kernel/misc_64.S
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@ -614,6 +614,18 @@ _GLOBAL(kexec_sequence)
li r0,0
std r0,16(r1)
BEGIN_FTR_SECTION
/*
* This is the best time to turn AMR/IAMR off.
* key 0 is used in radix for supervisor<->user
* protection, but on hash key 0 is reserved
* ideally we want to enter with a clean state.
* NOTE, we rely on r0 being 0 from above.
*/
mtspr SPRN_IAMR,r0
mtspr SPRN_AMOR,r0
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
/* save regs for local vars on new stack.
* yes, we won't go back, but ...
*/