From 62be8b044adf47327ebefdefb25f28a40316ebd0 Mon Sep 17 00:00:00 2001
From: Bharata B Rao <bharata@linux.vnet.ibm.com>
Date: Wed, 27 Jul 2016 10:44:42 +0530
Subject: [PATCH] spapr: Prevent boot CPU core removal

Boot CPU is assumed to be always present in QEMU code. So
until that assumptions are gone, deny removal request.
In another words, QEMU won't support boot CPU core hot-unplug.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
[dwg: Tweaked error message for clarity]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr_cpu_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index 5a132bfa1a..ec81ee6088 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -133,6 +133,11 @@ void spapr_core_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
     sPAPRDRConnectorClass *drck;
     Error *local_err = NULL;
 
+    if (index == 0) {
+        error_setg(errp, "Boot CPU core may not be unplugged");
+        return;
+    }
+
     g_assert(drc);
 
     drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);