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powerpc/book3s64/kuap: Use Key 3 to implement KUAP with hash translation.

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Radix use AMR Key 0 and hash translation use AMR key 3.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201127044424.40686-18-aneesh.kumar@linux.ibm.com
This commit is contained in:
Aneesh Kumar K.V 2020-11-27 10:14:19 +05:30 committed by Michael Ellerman
parent eb232b1624
commit fa46c2fa6f
1 changed files with 4 additions and 5 deletions
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9
arch/powerpc/include/asm/book3s/64/kup.h
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@ -5,11 +5,10 @@
#include <linux/const.h>
#include <asm/reg.h>
#define AMR_KUAP_BLOCK_READ UL(0x4000000000000000)
#define AMR_KUAP_BLOCK_WRITE UL(0x8000000000000000)
#define AMR_KUAP_BLOCK_READ UL(0x5455555555555555)
#define AMR_KUAP_BLOCK_WRITE UL(0xa8aaaaaaaaaaaaaa)
#define AMR_KUEP_BLOCKED (1UL << 62)
#define AMR_KUAP_BLOCKED (AMR_KUAP_BLOCK_READ | AMR_KUAP_BLOCK_WRITE)
#define AMR_KUAP_SHIFT 62
#ifdef __ASSEMBLY__
@ -62,8 +61,8 @@
#ifdef CONFIG_PPC_KUAP_DEBUG
BEGIN_MMU_FTR_SECTION_NESTED(67)
mfspr \gpr1, SPRN_AMR
li \gpr2, (AMR_KUAP_BLOCKED >> AMR_KUAP_SHIFT)
sldi \gpr2, \gpr2, AMR_KUAP_SHIFT
/* Prevent access to userspace using any key values */
LOAD_REG_IMMEDIATE(\gpr2, AMR_KUAP_BLOCKED)
999: tdne \gpr1, \gpr2
EMIT_BUG_ENTRY 999b, __FILE__, __LINE__, (BUGFLAG_WARNING | BUGFLAG_ONCE)
END_MMU_FTR_SECTION_NESTED_IFSET(MMU_FTR_BOOK3S_KUAP, 67)