spapr/irq: initialize the IRQ device only once

Add a check to make sure that the routine initializing the emulated
IRQ device is called once. We don't have much to test on the XICS
side, so we introduce a 'init' boolean under ICSState.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190513084245.25755-13-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 9 insertions, 0 deletions

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index a79574b23c..f6f6c29d6a 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -338,6 +338,15 @@ void spapr_xive_init(SpaprXive *xive, Error **errp)
     XiveSource *xsrc = &xive->source;
     XiveENDSource *end_xsrc = &xive->end_source;
 
+    /*
+     * The emulated XIVE device can only be initialized once. If the
+     * ESB memory region has been already mapped, it means we have been
+     * through there.
+     */
+    if (memory_region_is_mapped(&xsrc->esb_mmio)) {
+        return;
+    }
+
     /* TIMA initialization */
     memory_region_init_io(&xive->tm_mmio, OBJECT(xive), &xive_tm_ops, xive,
                           "xive.tima", 4ull << TM_SHIFT);