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selftests/powerpc: Fix pkey access right updates

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The Power ISA mandates that all writes to the Authority
Mask Register (AMR) must always be preceded as well as
succeeded by a context synchronizing instruction.

This makes sure that the tests follow this requirement
when attempting to update a pkey's access rights.

Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200604125610.649668-2-sandipan@linux.ibm.com
This commit is contained in:
Sandipan Das
2020-06-04 18:26:08 +05:30
committed by Michael Ellerman
parent 105fb38124
commit 828ca4320d
3 changed files with 8 additions and 2 deletions
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6
tools/testing/selftests/powerpc/include/reg.h
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@@ -57,6 +57,12 @@
#define SPRN_PPR 896 /* Program Priority Register */
#define SPRN_AMR 13 /* Authority Mask Register - problem state */
#define set_amr(v) asm volatile("isync;" \
"mtspr " __stringify(SPRN_AMR) ",%0;" \
"isync" : \
: "r" ((unsigned long)(v)) \
: "memory")
/* TEXASR register bits */
#define TEXASR_FC 0xFE00000000000000
#define TEXASR_FP 0x0100000000000000