powerpc/64s/exception: merge KVM handler and skip variants

Conditionally expand the skip case if it is specified.

No generated code change.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/exception-64s.h

@@ -436,26 +436,17 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 	.endif
 .endm
 
-.macro KVM_HANDLER area, hsrr, n
+.macro KVM_HANDLER area, hsrr, n, skip
+	.if \skip
+	cmpwi	r10,KVM_GUEST_MODE_SKIP
+	beq	89f
+	.else
 	BEGIN_FTR_SECTION_NESTED(947)
 	ld	r10,\area+EX_CFAR(r13)
 	std	r10,HSTATE_CFAR(r13)
 	END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947)
-	BEGIN_FTR_SECTION_NESTED(948)
-	ld	r10,\area+EX_PPR(r13)
-	std	r10,HSTATE_PPR(r13)
-	END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
-	ld	r10,\area+EX_R10(r13)
-	std	r12,HSTATE_SCRATCH0(r13)
-	sldi	r12,r9,32
-	ori	r12,r12,(\n)
-	/* This reloads r9 before branching to kvmppc_interrupt */
-	__BRANCH_TO_KVM_EXIT(\area, kvmppc_interrupt)
-.endm
+	.endif
 
-.macro KVM_HANDLER_SKIP area, hsrr, n
-	cmpwi	r10,KVM_GUEST_MODE_SKIP
-	beq	89f
 	BEGIN_FTR_SECTION_NESTED(948)
 	ld	r10,\area+EX_PPR(r13)
 	std	r10,HSTATE_PPR(r13)
@@ -466,6 +457,8 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 	ori	r12,r12,(\n)
 	/* This reloads r9 before branching to kvmppc_interrupt */
 	__BRANCH_TO_KVM_EXIT(\area, kvmppc_interrupt)
+
+	.if \skip
 89:	mtocrf	0x80,r9
 	ld	r9,\area+EX_R9(r13)
 	ld	r10,\area+EX_R10(r13)
@@ -474,14 +467,13 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 	.else
 	b	kvmppc_skip_interrupt
 	.endif
+	.endif
 .endm
 
 #else
 .macro KVMTEST hsrr, n
 .endm
-.macro KVM_HANDLER area, hsrr, n
-.endm
-.macro KVM_HANDLER_SKIP area, hsrr, n
+.macro KVM_HANDLER area, hsrr, n, skip
 .endm
 #endif
 

arch/powerpc/include/asm/head-64.h

@@ -387,22 +387,22 @@ end_##sname:
 
 #define TRAMP_KVM(area, n)						\
 	TRAMP_KVM_BEGIN(do_kvm_##n);					\
-	KVM_HANDLER area, EXC_STD, n
+	KVM_HANDLER area, EXC_STD, n, 0
 
 #define TRAMP_KVM_SKIP(area, n)						\
 	TRAMP_KVM_BEGIN(do_kvm_##n);					\
-	KVM_HANDLER_SKIP area, EXC_STD, n
+	KVM_HANDLER area, EXC_STD, n, 1
 
 /*
  * HV variant exceptions get the 0x2 bit added to their trap number.
  */
 #define TRAMP_KVM_HV(area, n)						\
 	TRAMP_KVM_BEGIN(do_kvm_H##n);					\
-	KVM_HANDLER area, EXC_HV, n + 0x2
+	KVM_HANDLER area, EXC_HV, n + 0x2, 0
 
 #define TRAMP_KVM_HV_SKIP(area, n)					\
 	TRAMP_KVM_BEGIN(do_kvm_H##n);					\
-	KVM_HANDLER_SKIP area, EXC_HV, n + 0x2
+	KVM_HANDLER area, EXC_HV, n + 0x2, 1
 
 #define EXC_COMMON(name, realvec, hdlr)					\
 	EXC_COMMON_BEGIN(name);						\

arch/powerpc/kernel/exceptions-64s.S

@@ -1063,7 +1063,7 @@ TRAMP_KVM_BEGIN(do_kvm_0xc00)
 	SET_SCRATCH0(r10)
 	std	r9,PACA_EXGEN+EX_R9(r13)
 	mfcr	r9
-	KVM_HANDLER PACA_EXGEN, EXC_STD, 0xc00
+	KVM_HANDLER PACA_EXGEN, EXC_STD, 0xc00, 0
 #endif