[Qemu-ppc] [PATCH v5 13/17] ppc/xics: add a xics_get_cpu_index_by_pir helper

[Cédric Le Goater]

We will need this helper to translate the server number of the XIVE
(which is a PIR) into an ICPState index number (which is a cpu index).

Signed-off-by: Cédric Le Goater <address@hidden>
---
 hw/intc/xics_native.c | 19 +++++++++++++++++++
 include/hw/ppc/xics.h |  1 +
 2 files changed, 20 insertions(+)

diff --git a/hw/intc/xics_native.c b/hw/intc/xics_native.c
index bbdd786aeb50..6318862f53fc 100644
--- a/hw/intc/xics_native.c
+++ b/hw/intc/xics_native.c
@@ -33,6 +33,25 @@
 
 #include <libfdt.h>
 
+int xics_get_cpu_index_by_pir(XICSState *xics, int pir)
+{
+    int i;
+
+    for (i = 0; i < xics->nr_servers; i++) {
+        ICPState *icp = &xics->ss[i];
+        if (icp->cs) {
+            PowerPCCPU *cpu = POWERPC_CPU(icp->cs);
+            CPUPPCState *env = &cpu->env;
+
+            if (env->spr_cb[SPR_PIR].default_value == pir) {
+                return i;
+            }
+        }
+    }
+
+    return -1;
+}
+
 static void xics_native_reset(void *opaque)
 {
     device_reset(DEVICE(opaque));
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index 911cdd5e549f..beb232e616c5 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -214,6 +214,7 @@ void xics_set_nr_servers(XICSState *xics, uint32_t 
nr_servers,
 
 /* Internal XICS interfaces */
 int xics_get_cpu_index_by_dt_id(int cpu_dt_id);
+int xics_get_cpu_index_by_pir(XICSState *xics, int pir);
 
 void icp_set_cppr(ICPState *icp, uint8_t cppr);
 void icp_set_mfrr(ICPState *icp, uint8_t mfrr);
-- 
2.7.4