KVM: ppc: e500: Fix the bug that KVM is unstable in SMP

TLB entry should enable memory coherence in SMP.

And like commit 631fba9dd3aca519355322cef035730609e91593,
remove guard attribute to enable the prefetch of guest memory.
Signed-off-by: NLiu Yu <yu.liu@freescale.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

arch/powerpc/kvm/e500_tlb.c

@@ -99,7 +99,11 @@ static inline u32 e500_shadow_mas3_attrib(u32 mas3, int usermode)
 
 static inline u32 e500_shadow_mas2_attrib(u32 mas2, int usermode)
 {
+#ifdef CONFIG_SMP
+	return (mas2 & MAS2_ATTRIB_MASK) | MAS2_M;
+#else
 	return mas2 & MAS2_ATTRIB_MASK;
+#endif
 }
 
 /*

arch/powerpc/kvm/e500_tlb.h

@@ -38,7 +38,7 @@
 #define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
 #define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
 #define MAS2_ATTRIB_MASK \
-	  (MAS2_X0 | MAS2_X1 | MAS2_W | MAS2_I | MAS2_M | MAS2_G | MAS2_E)
+	  (MAS2_X0 | MAS2_X1)
 #define MAS3_ATTRIB_MASK \
 	  (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
 	   | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)