From: Sam Bobroff <sam.bobroff@au1.ibm.com>
Date: Thu, 3 Aug 2017 06:28:27 +0000 (+1000)
Subject: spapr: Fix bug in h_signal_sys_reset()
X-Git-Tag: v2.10.0-rc3~18^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f57467e3b326c7736f8e481fd6b680f30e575c87;p=thirdparty%2Fqemu.git

spapr: Fix bug in h_signal_sys_reset()

The unicast case in h_signal_sys_reset() seems to be broken:
rather than selecting the target CPU, it looks like it will pick
either the first CPU or fail to find one at all.

Fix it by using the search function rather than open coding the
search.

This was found by inspection; the code appears to be unused because
the Linux kernel only uses the broadcast target.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 72ea5a8247b..07b3da8dc4c 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1431,11 +1431,10 @@ static target_ulong h_signal_sys_reset(PowerPCCPU *cpu,
 
     } else {
         /* Unicast */
-        CPU_FOREACH(cs) {
-            if (cpu->cpu_dt_id == target) {
-                run_on_cpu(cs, spapr_do_system_reset_on_cpu, RUN_ON_CPU_NULL);
-                return H_SUCCESS;
-            }
+        cs = CPU(ppc_get_vcpu_by_dt_id(target));
+        if (cs) {
+            run_on_cpu(cs, spapr_do_system_reset_on_cpu, RUN_ON_CPU_NULL);
+            return H_SUCCESS;
         }
         return H_PARAMETER;
     }