KVM: PPC: BOOK3S: Remove open coded make_dsisr in alignment handler

Use make_dsisr instead of open coding it. This also have
the added benefit of handling alignment interrupt on additional
instructions.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/include/asm/disassemble.h

@@ -81,4 +81,38 @@ static inline unsigned int get_oc(u32 inst)
 {
 	return (inst >> 11) & 0x7fff;
 }
+
+#define IS_XFORM(inst)	(get_op(inst)  == 31)
+#define IS_DSFORM(inst)	(get_op(inst) >= 56)
+
+/*
+ * Create a DSISR value from the instruction
+ */
+static inline unsigned make_dsisr(unsigned instr)
+{
+	unsigned dsisr;
+
+
+	/* bits  6:15 --> 22:31 */
+	dsisr = (instr & 0x03ff0000) >> 16;
+
+	if (IS_XFORM(instr)) {
+		/* bits 29:30 --> 15:16 */
+		dsisr |= (instr & 0x00000006) << 14;
+		/* bit     25 -->    17 */
+		dsisr |= (instr & 0x00000040) << 8;
+		/* bits 21:24 --> 18:21 */
+		dsisr |= (instr & 0x00000780) << 3;
+	} else {
+		/* bit      5 -->    17 */
+		dsisr |= (instr & 0x04000000) >> 12;
+		/* bits  1: 4 --> 18:21 */
+		dsisr |= (instr & 0x78000000) >> 17;
+		/* bits 30:31 --> 12:13 */
+		if (IS_DSFORM(instr))
+			dsisr |= (instr & 0x00000003) << 18;
+	}
+
+	return dsisr;
+}
 #endif /* __ASM_PPC_DISASSEMBLE_H__ */

arch/powerpc/kernel/align.c

@@ -25,14 +25,13 @@
 #include <asm/cputable.h>
 #include <asm/emulated_ops.h>
 #include <asm/switch_to.h>
+#include <asm/disassemble.h>
 
 struct aligninfo {
 	unsigned char len;
 	unsigned char flags;
 };
 
-#define IS_XFORM(inst)	(((inst) >> 26) == 31)
-#define IS_DSFORM(inst)	(((inst) >> 26) >= 56)
 
 #define INVALID	{ 0, 0 }
 
@@ -191,37 +190,6 @@ static struct aligninfo aligninfo[128] = {
 	INVALID,		/* 11 1 1111 */
 };
 
-/*
- * Create a DSISR value from the instruction
- */
-static inline unsigned make_dsisr(unsigned instr)
-{
-	unsigned dsisr;
-
-
-	/* bits  6:15 --> 22:31 */
-	dsisr = (instr & 0x03ff0000) >> 16;
-
-	if (IS_XFORM(instr)) {
-		/* bits 29:30 --> 15:16 */
-		dsisr |= (instr & 0x00000006) << 14;
-		/* bit     25 -->    17 */
-		dsisr |= (instr & 0x00000040) << 8;
-		/* bits 21:24 --> 18:21 */
-		dsisr |= (instr & 0x00000780) << 3;
-	} else {
-		/* bit      5 -->    17 */
-		dsisr |= (instr & 0x04000000) >> 12;
-		/* bits  1: 4 --> 18:21 */
-		dsisr |= (instr & 0x78000000) >> 17;
-		/* bits 30:31 --> 12:13 */
-		if (IS_DSFORM(instr))
-			dsisr |= (instr & 0x00000003) << 18;
-	}
-
-	return dsisr;
-}
-
 /*
  * The dcbz (data cache block zero) instruction
  * gives an alignment fault if used on non-cacheable

arch/powerpc/kvm/book3s_emulate.c

@@ -634,44 +634,7 @@ unprivileged:
 
 u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst)
 {
-	u32 dsisr = 0;
-
-	/*
-	 * This is what the spec says about DSISR bits (not mentioned = 0):
-	 *
-	 * 12:13		[DS]	Set to bits 30:31
-	 * 15:16		[X]	Set to bits 29:30
-	 * 17			[X]	Set to bit 25
-	 *			[D/DS]	Set to bit 5
-	 * 18:21		[X]	Set to bits 21:24
-	 *			[D/DS]	Set to bits 1:4
-	 * 22:26			Set to bits 6:10 (RT/RS/FRT/FRS)
-	 * 27:31			Set to bits 11:15 (RA)
-	 */
-
-	switch (get_op(inst)) {
-	/* D-form */
-	case OP_LFS:
-	case OP_LFD:
-	case OP_STFD:
-	case OP_STFS:
-		dsisr |= (inst >> 12) & 0x4000;	/* bit 17 */
-		dsisr |= (inst >> 17) & 0x3c00; /* bits 18:21 */
-		break;
-	/* X-form */
-	case 31:
-		dsisr |= (inst << 14) & 0x18000; /* bits 15:16 */
-		dsisr |= (inst << 8)  & 0x04000; /* bit 17 */
-		dsisr |= (inst << 3)  & 0x03c00; /* bits 18:21 */
-		break;
-	default:
-		printk(KERN_INFO "KVM: Unaligned instruction 0x%x\n", inst);
-		break;
-	}
-
-	dsisr |= (inst >> 16) & 0x03ff; /* bits 22:31 */
-
-	return dsisr;
+	return make_dsisr(inst);
 }
 
 ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst)