The XiveFabric QOM interface acts as the PowerBUS interface between
the interrupt controller and the system and should be implemented by
the QEMU machine. On HW, the XIVE sub-engine is responsible for the
communication with the other chip is the Common Queue (CQ) bridge
unit.

This interface offers a 'match_nvt' handler to perform the CAM line
matching when looking for a XIVE Presenter with a dispatched NVT.

Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 include/hw/ppc/xive.h | 22 ++++++++++++++++++++++
 hw/intc/xive.c        | 10 ++++++++++
 2 files changed, 32 insertions(+)

diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
index f9aa0fa0dac3..b00af988779b 100644
--- a/include/hw/ppc/xive.h
+++ b/include/hw/ppc/xive.h
@@ -399,6 +399,28 @@ int xive_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx,
                               uint8_t nvt_blk, uint32_t nvt_idx,
                               bool cam_ignore, uint32_t logic_serv);
 
+/*
+ * XIVE Fabric (Interface between Interrupt Controller and Machine)
+ */
+
+typedef struct XiveFabric XiveFabric;
+
+#define TYPE_XIVE_FABRIC "xive-fabric"
+#define XIVE_FABRIC(obj)                                     \
+    INTERFACE_CHECK(XiveFabric, (obj), TYPE_XIVE_FABRIC)
+#define XIVE_FABRIC_CLASS(klass)                                     \
+    OBJECT_CLASS_CHECK(XiveFabricClass, (klass), TYPE_XIVE_FABRIC)
+#define XIVE_FABRIC_GET_CLASS(obj)                                   \
+    OBJECT_GET_CLASS(XiveFabricClass, (obj), TYPE_XIVE_FABRIC)
+
+typedef struct XiveFabricClass {
+    InterfaceClass parent;
+    int (*match_nvt)(XiveFabric *xfb, uint8_t format,
+                     uint8_t nvt_blk, uint32_t nvt_idx,
+                     bool cam_ignore, uint8_t priority,
+                     uint32_t logic_serv, XiveTCTXMatch *match);
+} XiveFabricClass;
+
 /*
  * XIVE END ESBs
  */
diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index da6196ca958f..1c9e58f8deac 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -1893,8 +1893,18 @@ static const TypeInfo xive_presenter_info = {
     .class_size = sizeof(XivePresenterClass),
 };
 
+/*
+ * XIVE Fabric
+ */
+static const TypeInfo xive_fabric_info = {
+    .name = TYPE_XIVE_FABRIC,
+    .parent = TYPE_INTERFACE,
+    .class_size = sizeof(XiveFabricClass),
+};
+
 static void xive_register_types(void)
 {
+    type_register_static(&xive_fabric_info);
     type_register_static(&xive_source_info);
     type_register_static(&xive_notifier_info);
     type_register_static(&xive_presenter_info);
-- 
2.21.0