From 090b9284d72561644d17a6e568d29c9e472c9865 Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Fri, 28 Jun 2013 18:17:09 +1000 Subject: [PATCH] powerpc/tm: Clear MSR RI in non-recoverable TM code When we treclaim and trecheckpoint there's an unavoidable period when r1 will not be a valid kernel stack pointer. This patch clears the MSR recoverable interrupt (RI) bit over these regions to indicate we have an invalid kernel stack pointer. For treclaim, the region over which we clear MSR RI is larger than required to avoid the need for an extra costly mtmsrd. Thanks to Paulus for suggesting this change. Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/tm.S | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S index 2da67e7a16d5..51be8fb24803 100644 --- a/arch/powerpc/kernel/tm.S +++ b/arch/powerpc/kernel/tm.S @@ -112,9 +112,18 @@ _GLOBAL(tm_reclaim) std r3, STACK_PARAM(0)(r1) SAVE_NVGPRS(r1) + /* We need to setup MSR for VSX register save instructions. Here we + * also clear the MSR RI since when we do the treclaim, we won't have a + * valid kernel pointer for a while. We clear RI here as it avoids + * adding another mtmsr closer to the treclaim. This makes the region + * maked as non-recoverable wider than it needs to be but it saves on + * inserting another mtmsrd later. + */ mfmsr r14 mr r15, r14 ori r15, r15, MSR_FP + li r16, MSR_RI + andc r15, r15, r16 oris r15, r15, MSR_VEC@h #ifdef CONFIG_VSX BEGIN_FTR_SECTION @@ -349,9 +358,10 @@ restore_gprs: mtcr r5 mtxer r6 - /* MSR and flags: We don't change CRs, and we don't need to alter - * MSR. + /* Clear the MSR RI since we are about to change R1. EE is already off */ + li r4, 0 + mtmsrd r4, 1 REST_4GPRS(0, r7) /* GPR0-3 */ REST_GPR(4, r7) /* GPR4-6 */ @@ -377,6 +387,10 @@ restore_gprs: GET_PACA(r13) GET_SCRATCH0(r1) + /* R1 is restored, so we are recoverable again. EE is still off */ + li r4, MSR_RI + mtmsrd r4, 1 + REST_NVGPRS(r1) addi r1, r1, TM_FRAME_SIZE -- 2.34.1