1 files changed, 17 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c
index c9924475368f..3f295269af37 100644
--- a/arch/powerpc/kvm/book3s_emulate.c
+++ b/arch/powerpc/kvm/book3s_emulate.c
@@ -94,8 +94,25 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
         int rs = get_rs(inst);
         int ra = get_ra(inst);
         int rb = get_rb(inst);
+        u32 inst_sc = 0x44000002;
 
         switch (get_op(inst)) {
+        case 0:
+                emulated = EMULATE_FAIL;
+                if ((kvmppc_get_msr(vcpu) & MSR_LE) &&
+                    (inst == swab32(inst_sc))) {
+                        /*
+                         * This is the byte reversed syscall instruction of our
+                         * hypercall handler. Early versions of LE Linux didn't
+                         * swap the instructions correctly and ended up in
+                         * illegal instructions.
+                         * Just always fail hypercalls on these broken systems.
+                         */
+                        kvmppc_set_gpr(vcpu, 3, EV_UNIMPLEMENTED);
+                        kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
+                        emulated = EMULATE_DONE;
+                }
+                break;
         case 19:
                 switch (get_xop(inst)) {
                 case OP_19_XOP_RFID: