[Qemu-ppc] [PATCH v3 14/15] spapr/irq: initialize the IRQ device only once

[Cédric Le Goater]

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 'static bool'. Not very elegant but works well
enough.

Signed-off-by: Cédric Le Goater <address@hidden>
---
 hw/intc/spapr_xive.c |  9 +++++++++
 hw/intc/xics_spapr.c | 10 ++++++++++
 2 files changed, 19 insertions(+)

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index f889c89dc2e9..15d41d9cd36d 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -337,6 +337,15 @@ 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);
diff --git a/hw/intc/xics_spapr.c b/hw/intc/xics_spapr.c
index 9d2b8adef7c5..67e82f3720b0 100644
--- a/hw/intc/xics_spapr.c
+++ b/hw/intc/xics_spapr.c
@@ -239,6 +239,16 @@ static void rtas_int_on(PowerPCCPU *cpu, SpaprMachineState 
*spapr,
 
 void xics_spapr_init(SpaprMachineState *spapr)
 {
+    static bool init_done;
+
+    /*
+     * Emulated mode can only be initialized once.
+     */
+    if (init_done) {
+        return;
+    }
+    init_done = true;
+
     /* Registration of global state belongs into realize */
     spapr_rtas_register(RTAS_IBM_SET_XIVE, "ibm,set-xive", rtas_set_xive);
     spapr_rtas_register(RTAS_IBM_GET_XIVE, "ibm,get-xive", rtas_get_xive);
-- 
2.20.1