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KVM: PPC: Book3S HV: Use POWER9 SLBIA IH=6 variant to clear SLB 

IH=6 may preserve hypervisor real-mode ERAT entries and is the
recommended SLBIA hint for switching partitions.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Nicholas Piggin 2021-01-18 16:28:09 +10:00 committed by Paul Mackerras
parent 078ebe35fc
commit 7a7f94a3a9
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/kvm/book3s_hv_rmhandlers.S
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@ -912,7 +912,7 @@ BEGIN_MMU_FTR_SECTION
/* Radix host won't have populated the SLB, so no need to clear */
li r6, 0
slbmte r6, r6
slbia
PPC_SLBIA(6)
ptesync
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
@ -1520,7 +1520,7 @@ guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */
/* Finally clear out the SLB */
li r0,0
slbmte r0,r0
slbia
PPC_SLBIA(6)
ptesync
stw r5,VCPU_SLB_MAX(r9)
@ -3352,7 +3352,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_DAWR1)
/* Clear hash and radix guest SLB, see guest_exit_short_path comment. */
slbmte r0, r0
slbia
PPC_SLBIA(6)
BEGIN_MMU_FTR_SECTION
b 4f