[Qemu-devel] [RFC PATCH v2 05/21] ppc/xive: allocate IRQ numbers for the IPIs

[Cédric Le Goater]

The number of IPIs is deduced from the max number of CPUs the guest
supports and the IRQ numbers for the IPIs are allocated from the top
of the IRQ number space to reduce conflict with other IRQ numbers
allocated by the devices.

Signed-off-by: Cédric Le Goater <address@hidden>
---
 hw/intc/spapr_xive.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index 1681affb0848..52c32f588d6d 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -58,6 +58,7 @@ static void spapr_xive_realize(DeviceState *dev, Error **errp)
     sPAPRXive *xive = SPAPR_XIVE(dev);
     Object *obj;
     Error *err = NULL;
+    int i;
 
     if (!xive->nr_targets) {
         error_setg(errp, "Number of interrupt targets needs to be greater 0");
@@ -80,6 +81,11 @@ static void spapr_xive_realize(DeviceState *dev, Error 
**errp)
 
     xive->ics = ICS_BASE(obj);
 
+    /* Allocate the last IRQ numbers for the IPIs */
+    for (i = xive->nr_irqs - xive->nr_targets; i < xive->nr_irqs; i++) {
+        ics_set_irq_type(xive->ics, i, false);
+    }
+
     /* Allocate SBEs (State Bit Entry). 2 bits, so 4 entries per byte */
     xive->sbe_size = DIV_ROUND_UP(xive->nr_irqs, 4);
     xive->sbe = g_malloc0(xive->sbe_size);
-- 
2.13.5