hw/isa/lpc_ich9: negotiate SMI broadcast on pc-q35-2.9+ machine types

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NLaszlo Ersek <lersek@redhat.com>
Reviewed-by: NEduardo Habkost <ehabkost@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NIgor Mammedov <imammedo@redhat.com>
Message-Id: <20170126014416.11211-4-lersek@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/isa/lpc_ich9.c

@@ -776,6 +776,8 @@ static const VMStateDescription vmstate_ich9_lpc = {
 
 static Property ich9_lpc_properties[] = {
     DEFINE_PROP_BOOL("noreboot", ICH9LPCState, pin_strap.spkr_hi, true),
+    DEFINE_PROP_BIT64("x-smi-broadcast", ICH9LPCState, smi_host_features,
+                      ICH9_LPC_SMI_F_BROADCAST_BIT, true),
     DEFINE_PROP_END_OF_LIST(),
 };
 

include/hw/i386/pc.h

@@ -381,6 +381,12 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .property = "x-mach-use-reliable-get-clock",\
         .value    = "off",\
     },\
+    {\
+        .driver   = "ICH9-LPC",\
+        .property = "x-smi-broadcast",\
+        .value    = "off",\
+    },\
+
 
 #define PC_COMPAT_2_7 \
     HW_COMPAT_2_7 \