KVM: PPC: Book3S_64 PR: Access shadow slb in big endian

The "shadow SLB" in the PACA is shared with the hypervisor, so it has to
be big endian. We access the shadow SLB during world switch, so let's make
sure we access it in big endian even when we're on a little endian host.
Signed-off-by: NAlexander Graf <agraf@suse.de>

arch/powerpc/kvm/book3s_64_slb.S

@@ -17,29 +17,28 @@
  * Authors: Alexander Graf <agraf@suse.de>
  */
 
-#ifdef __LITTLE_ENDIAN__
-#error Need to fix SLB shadow accesses in little endian mode
-#endif
-
 #define SHADOW_SLB_ESID(num)	(SLBSHADOW_SAVEAREA + (num * 0x10))
 #define SHADOW_SLB_VSID(num)	(SLBSHADOW_SAVEAREA + (num * 0x10) + 0x8)
 #define UNBOLT_SLB_ENTRY(num) \
-	ld	r9, SHADOW_SLB_ESID(num)(r12); \
-	/* Invalid? Skip. */; \
-	rldicl. r0, r9, 37, 63; \
-	beq	slb_entry_skip_ ## num; \
-	xoris	r9, r9, SLB_ESID_V@h; \
-	std	r9, SHADOW_SLB_ESID(num)(r12); \
+	li	r11, SHADOW_SLB_ESID(num);	\
+	LDX_BE	r9, r12, r11;			\
+	/* Invalid? Skip. */;			\
+	rldicl. r0, r9, 37, 63;			\
+	beq	slb_entry_skip_ ## num;		\
+	xoris	r9, r9, SLB_ESID_V@h;		\
+	STDX_BE	r9, r12, r11;			\
   slb_entry_skip_ ## num:
 
 #define REBOLT_SLB_ENTRY(num) \
-	ld	r10, SHADOW_SLB_ESID(num)(r11); \
-	cmpdi	r10, 0; \
-	beq	slb_exit_skip_ ## num; \
-	oris	r10, r10, SLB_ESID_V@h; \
-	ld	r9, SHADOW_SLB_VSID(num)(r11); \
-	slbmte	r9, r10; \
-	std	r10, SHADOW_SLB_ESID(num)(r11); \
+	li	r8, SHADOW_SLB_ESID(num);	\
+	li	r7, SHADOW_SLB_VSID(num);	\
+	LDX_BE	r10, r11, r8;			\
+	cmpdi	r10, 0;				\
+	beq	slb_exit_skip_ ## num;		\
+	oris	r10, r10, SLB_ESID_V@h;		\
+	LDX_BE	r9, r11, r7;			\
+	slbmte	r9, r10;			\
+	STDX_BE	r10, r11, r8;			\
 slb_exit_skip_ ## num:
 
 /******************************************************************************