spapr/xive: remove redundant check in spapr_match_nvt()

spapr_match_nvt() is a XIVE operation and is used by the machine to
look for a matching target when an event notification is being
delivered. An assert checks that spapr_match_nvt() is called only when
the machine has selected the XIVE interrupt mode but it is redundant
with the XIVE_PRESENTER() dynamic cast.

Apply the cast to spapr->active_intc and remove the assert.
Signed-off-by: NCédric Le Goater <clg@kaod.org>
Message-Id: <20200106163207.4608-1-clg@kaod.org>
Reviewed-by: NGreg Kurz <groug@kaod.org>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

hw/ppc/spapr.c

@@ -4195,19 +4195,19 @@ static void spapr_pic_print_info(InterruptStatsProvider *obj,
                    kvm_irqchip_in_kernel() ? "in-kernel" : "emulated");
 }
 
+/*
+ * This is a XIVE only operation
+ */
 static int spapr_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)
 {
     SpaprMachineState *spapr = SPAPR_MACHINE(xfb);
-    XivePresenter *xptr = XIVE_PRESENTER(spapr->xive);
+    XivePresenter *xptr = XIVE_PRESENTER(spapr->active_intc);
     XivePresenterClass *xpc = XIVE_PRESENTER_GET_CLASS(xptr);
     int count;
 
-    /* This is a XIVE only operation */
-    assert(spapr->active_intc == SPAPR_INTC(spapr->xive));
-
     count = xpc->match_nvt(xptr, format, nvt_blk, nvt_idx, cam_ignore,
                            priority, logic_serv, match);
     if (count < 0) {