KVM: fix emulator_task_switch() return value.

emulator_task_switch() should return -1 for failure and 0 for success to
the caller, just like x86_emulate_insn() does.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 585d0ef..5ac0bb4 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2453,7 +2453,7 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
                rc = writeback(ctxt, ops);
        }
 
-       return rc;
+       return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
 }
 
 static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned long base,

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 58a295c..30efeea 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4800,10 +4800,11 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
                                   tss_selector, reason, has_error_code,
                                   error_code);
 
-       if (ret == X86EMUL_CONTINUE)
-               kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
+       if (ret)
+               return EMULATE_FAIL;
 
-       return (ret != X86EMUL_CONTINUE);
+       kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
+       return EMULATE_DONE;
 }
 EXPORT_SYMBOL_GPL(kvm_task_switch);