[PATCH] Fix "[v3, 10/32] powerpc/64s/exception: move real->virt switch into the common handler"

[PATCH] Fix "[v3, 10/32] powerpc/64s/exception: move real->virt switch into the common handler"

[Nicholas Piggin]

It's possible for interrupts to be replayed when TM is enabled and
suspended, for example rt_sigreturn, where the mtmsrd MSR_KERNEL in
the real-mode entry point to the common handler causes a TM Bad Thing
exception (due to attempting to clear suspended).

The fix for this is to have replay interrupts go to the _virt entry
point and skip the mtmsrd, which matches what happens before this
patch.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/kernel/exceptions-64s.S | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 112cdb446e03..42fced32c8af 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -2757,12 +2757,12 @@ handle_dabr_fault:
 h_doorbell_common_msgclr:
 	LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36))
 	PPC_MSGCLR(3)
-	b 	h_doorbell_common
+	b 	h_doorbell_common_virt
 
 doorbell_super_common_msgclr:
 	LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36))
 	PPC_MSGCLRP(3)
-	b 	doorbell_super_common
+	b 	doorbell_super_common_virt
 
 /*
  * Called from arch_local_irq_enable when an interrupt needs
@@ -2788,20 +2788,20 @@ _GLOBAL(__replay_interrupt)
 	mfcr	r9
 	ori	r12,r12,MSR_EE
 	cmpwi	r3,0x900
-	beq	decrementer_common
+	beq	decrementer_common_virt
 	cmpwi	r3,0x500
 BEGIN_FTR_SECTION
-	beq	h_virt_irq_common
+	beq	h_virt_irq_common_virt
 FTR_SECTION_ELSE
-	beq	hardware_interrupt_common
+	beq	hardware_interrupt_common_virt
 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_300)
 	cmpwi	r3,0xf00
-	beq	performance_monitor_common
+	beq	performance_monitor_common_virt
 BEGIN_FTR_SECTION
 	cmpwi	r3,0xa00
 	beq	h_doorbell_common_msgclr
 	cmpwi	r3,0xe60
-	beq	hmi_exception_common
+	beq	hmi_exception_common_virt
 FTR_SECTION_ELSE
 	cmpwi	r3,0xa00
 	beq	doorbell_super_common_msgclr
-- 
2.23.0