[PATCH v2] target-i386/kvm: Hyper-V VMBus hypercalls blank handlers

[Andrey Smetanin <asmetanin@xxxxxxxxxxxxx>]

Add Hyper-V VMBus hypercalls blank handlers which
just returns error code - HV_STATUS_INVALID_HYPERCALL_CODE.

Changes v2:
* use KVM_EXIT_HYPERV exit type

Signed-off-by: Andrey Smetanin <asmetanin@xxxxxxxxxxxxx>
Reviewed-by: Roman Kagan <rkagan@xxxxxxxxxxxxx>
CC: Paolo Bonzini <pbonzini@xxxxxxxxxx>
CC: Richard Henderson <rth@xxxxxxxxxxx>
CC: Eduardo Habkost <ehabkost@xxxxxxxxxx>
CC: "Andreas Färber" <afaerber@xxxxxxx>
CC: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
CC: Roman Kagan <rkagan@xxxxxxxxxxxxx>
CC: Denis V. Lunev <den@xxxxxxxxxx>
CC: kvm@xxxxxxxxxxxxxxx

---
 target-i386/hyperv.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/target-i386/hyperv.c b/target-i386/hyperv.c
index e79b173..d3f3059 100644
--- a/target-i386/hyperv.c
+++ b/target-i386/hyperv.c
@@ -43,6 +43,18 @@ int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
             return -1;
         }
         return 0;
+    case KVM_EXIT_HYPERV_HCALL: {
+        uint16_t code;
+
+        code  = exit->u.hcall.input & 0xffff;
+        switch (code) {
+        case HV_X64_HCALL_POST_MESSAGE:
+        case HV_X64_HCALL_SIGNAL_EVENT:
+        default:
+            exit->u.hcall.result = HV_STATUS_INVALID_HYPERCALL_CODE;
+            return 0;
+        }
+    }
     default:
         return -1;
     }
-- 
2.4.3

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