powerpc: Fix little endian lppaca, slb_shadow and dtl_entry

The lppaca, slb_shadow and dtl_entry hypervisor structures are
big endian, so we have to byte swap them in little endian builds.

LE KVM hosts will also need to be fixed but for now add an #error
to remind us.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 11 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/asm-compat.h b/arch/powerpc/include/asm/asm-compat.h
index 6e82f5f9a6fd..4b237aa35660 100644
--- a/arch/powerpc/include/asm/asm-compat.h
+++ b/arch/powerpc/include/asm/asm-compat.h
@@ -32,6 +32,15 @@
 #define PPC_MTOCRF(FXM, RS) MTOCRF((FXM), RS)
 #define PPC_LR_STKOFF   16
 #define PPC_MIN_STKFRM  112
+
+#ifdef __BIG_ENDIAN__
+#define LDX_BE  stringify_in_c(ldx)
+#define STDX_BE stringify_in_c(stdx)
+#else
+#define LDX_BE  stringify_in_c(ldbrx)
+#define STDX_BE stringify_in_c(stdbrx)
+#endif
+
 #else /* 32-bit */
 
 /* operations for longs and pointers */
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index b5c85f18faee..4ebb4f8f4188 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -54,7 +54,8 @@ BEGIN_FW_FTR_SECTION;							\
         /* from user - see if there are any DTL entries to process */   \
         ld      r10,PACALPPACAPTR(r13); /* get ptr to VPA */            \
         ld      r11,PACA_DTL_RIDX(r13); /* get log read index */        \
-        ld      r10,LPPACA_DTLIDX(r10); /* get log write index */       \
+        addi    r10,r10,LPPACA_DTLIDX;                                  \
+        LDX_BE  r10,0,r10;              /* get log write index */       \
         cmpd    cr1,r11,r10;                                            \
         beq+    cr1,33f;                                                \
         bl      .accumulate_stolen_time;                                \