[Qemu-devel] [PATCH v4 04/16] pc: forbid BSP removal

[Igor Mammedov]

BSP is assumed to always present in QEMU code, so
untile that assumptions are gone, deny removal request.
In another words QEMU won't support BSP hot-unplug.

Signed-off-by: Igor Mammedov <address@hidden>
---
 hw/i386/pc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 5a67f15..33c5f97 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1751,10 +1751,17 @@ out:
 static void pc_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
                                      DeviceState *dev, Error **errp)
 {
+    int idx;
     HotplugHandlerClass *hhc;
     Error *local_err = NULL;
     PCMachineState *pcms = PC_MACHINE(hotplug_dev);
 
+    pc_find_cpu_slot(pcms, CPU(dev), &idx);
+    if (idx == 0) {
+        error_setg(&local_err, "1st CPU (BSP) is unpluggable");
+        goto out;
+    }
+
     hhc = HOTPLUG_HANDLER_GET_CLASS(pcms->acpi_dev);
     hhc->unplug_request(HOTPLUG_HANDLER(pcms->acpi_dev), dev, &local_err);
 
-- 
2.7.4