spapr/irq: remove the XICS offset adjustment

Now that we have changed the XICS and the XIVE interrupt backend to
have different size for their IRQ number space, we do not need to
align their source numbers anymore. Remove the offset adjustment and
wire the dual 'qirq' handler to the 'qirq' handler of the current
interrupt mode in use.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190213210756.27032-3-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/ppc/spapr_irq.c

@@ -453,17 +453,6 @@ static void spapr_irq_init_dual(sPAPRMachineState *spapr, int nr_irqs,
         return;
     }
 
-    /*
-     * Align the XICS and the XIVE IRQ number space under QEMU.
-     *
-     * However, the XICS KVM device still considers that the IRQ
-     * numbers should start at XICS_IRQ_BASE (0x1000). Either we
-     * should introduce a KVM device ioctl to set the offset or ignore
-     * the lower 4K numbers when using the get/set ioctl of the XICS
-     * KVM device. The second option seems the least intrusive.
-     */
-    spapr->ics->offset = 0;
-
     spapr_irq_xive.init(spapr, spapr_irq_xive.nr_irqs, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
@@ -500,21 +489,7 @@ static void spapr_irq_free_dual(sPAPRMachineState *spapr, int irq, int num)
 
 static qemu_irq spapr_qirq_dual(sPAPRMachineState *spapr, int irq)
 {
-    sPAPRXive *xive = spapr->xive;
-    ICSState *ics = spapr->ics;
-
-    if (irq >= spapr->irq->nr_irqs) {
-        return NULL;
-    }
-
-    /*
-     * The IRQ number should have been claimed under both interrupt
-     * controllers.
-     */
-    assert(!ICS_IRQ_FREE(ics, irq - ics->offset));
-    assert(xive_eas_is_valid(&xive->eat[irq]));
-
-    return spapr->qirqs[irq];
+    return spapr_irq_current(spapr)->qirq(spapr, irq);
 }
 
 static void spapr_irq_print_info_dual(sPAPRMachineState *spapr, Monitor *mon)