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powerpc/64s/radix: keep kernel ERAT over local process/guest invalidates

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ISA v3.0 radix modes provide SLBIA variants which can invalidate ERAT
for effPID!=0 or for effLPID!=0, which allows user and guest
invalidations to retain kernel/host ERAT entries.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2019-06-23 20:41:52 +10:00
committed by Michael Ellerman
parent fe7946ce08
commit 6c46fcce39
3 changed files with 16 additions and 5 deletions
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9
arch/powerpc/include/asm/ppc-opcode.h
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@@ -591,7 +591,16 @@
#define PPC_SLBIA(IH) stringify_in_c(.long PPC_INST_SLBIA | \
((IH & 0x7) << 21))
/*
* These may only be used on ISA v3.0 or later (aka. CPU_FTR_ARCH_300, radix
* implies CPU_FTR_ARCH_300). USER/GUEST invalidates may only be used by radix
* mode (on HPT these would also invalidate various SLBEs which may not be
* desired).
*/
#define PPC_ISA_3_0_INVALIDATE_ERAT PPC_SLBIA(7)
#define PPC_RADIX_INVALIDATE_ERAT_USER PPC_SLBIA(3)
#define PPC_RADIX_INVALIDATE_ERAT_GUEST PPC_SLBIA(6)
#define VCMPEQUD_RC(vrt, vra, vrb) stringify_in_c(.long PPC_INST_VCMPEQUD | \
___PPC_RT(vrt) | ___PPC_RA(vra) | \