KVM: PPC: PV tlbsync to nop

With our current MMU scheme we don't need to know about the tlbsync instruction.
So we can just nop it out.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 9ec572c4d2a5..3258922cc22c 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -62,6 +62,8 @@
 #define KVM_INST_MTSPR_DAR      0x7c1303a6
 #define KVM_INST_MTSPR_DSISR    0x7c1203a6
 
+#define KVM_INST_TLBSYNC        0x7c00046c
+
 static bool kvm_patching_worked = true;
 
 static inline void kvm_patch_ins(u32 *inst, u32 new_inst)
@@ -98,6 +100,11 @@ static void kvm_patch_ins_stw(u32 *inst, long addr, u32 rt)
         kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc));
 }
 
+static void kvm_patch_ins_nop(u32 *inst)
+{
+        kvm_patch_ins(inst, KVM_INST_NOP);
+}
+
 static void kvm_map_magic_page(void *data)
 {
         kvm_hypercall2(KVM_HC_PPC_MAP_MAGIC_PAGE,
@@ -166,6 +173,11 @@ static void kvm_check_ins(u32 *inst)
         case KVM_INST_MTSPR_DSISR:
                 kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt);
                 break;
+
+        /* Nops */
+        case KVM_INST_TLBSYNC:
+                kvm_patch_ins_nop(inst);
+                break;
         }
 
         switch (_inst) {