[PATCH 1/4] KVM: PPC: e500mc: Revert "add load inst fixup"

[Mihai Caraman]

Load external pid (lwepx) execution faults, generated by KVM accessing
guest contexts, needs to be handled by KVM. In the current implementation
the host kernel handles lwepx faults, searching for the faulting address
with its own Logical Partition ID (LPID) context! In case a host
translation is found, the execution returns to the lwepx instruction
instead of the fixup ending up in an infinite loop.

Revert the commit 1d628af7 "add load inst fixup". We will address lwepx
issue in a subsequent patch without the need of fixups.

Signed-off-by: Mihai Caraman <mihai.caraman at freescale.com>
---
 arch/powerpc/kvm/bookehv_interrupts.S |   26 +-------------------------
 1 files changed, 1 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/kvm/bookehv_interrupts.S b/arch/powerpc/kvm/bookehv_interrupts.S
index e8ed7d6..20c7a54 100644
--- a/arch/powerpc/kvm/bookehv_interrupts.S
+++ b/arch/powerpc/kvm/bookehv_interrupts.S
@@ -29,7 +29,6 @@
 #include <asm/asm-compat.h>
 #include <asm/asm-offsets.h>
 #include <asm/bitsperlong.h>
-#include <asm/thread_info.h>
 
 #ifdef CONFIG_64BIT
 #include <asm/exception-64e.h>
@@ -162,32 +161,9 @@
 	PPC_STL	r30, VCPU_GPR(R30)(r4)
 	PPC_STL	r31, VCPU_GPR(R31)(r4)
 	mtspr	SPRN_EPLC, r8
-
-	/* disable preemption, so we are sure we hit the fixup handler */
-	CURRENT_THREAD_INFO(r8, r1)
-	li	r7, 1
-	stw	r7, TI_PREEMPT(r8)
-
 	isync
-
-	/*
-	 * In case the read goes wrong, we catch it and write an invalid value
-	 * in LAST_INST instead.
-	 */
-1:	lwepx	r9, 0, r5
-2:
-.section .fixup, "ax"
-3:	li	r9, KVM_INST_FETCH_FAILED
-	b	2b
-.previous
-.section __ex_table,"a"
-	PPC_LONG_ALIGN
-	PPC_LONG 1b,3b
-.previous
-
+	lwepx   r9, 0, r5
 	mtspr	SPRN_EPLC, r3
-	li	r7, 0
-	stw	r7, TI_PREEMPT(r8)
 	stw	r9, VCPU_LAST_INST(r4)
 	.endif
 
-- 
1.7.3.4