Revert "pc: memhp: force gaps between DIMM's GPA"

This reverts commit aa8580cd.

As described in
http://article.gmane.org/gmane.comp.emulators.qemu/371432
that commit causes linux guests to crash on memory hot-unplug.

The original problem it's trying to solve has now
been addressed within virtio.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/i386/pc.c

@@ -1616,7 +1616,6 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
     HotplugHandlerClass *hhc;
     Error *local_err = NULL;
     PCMachineState *pcms = PC_MACHINE(hotplug_dev);
-    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
     PCDIMMDevice *dimm = PC_DIMM(dev);
     PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
     MemoryRegion *mr = ddc->get_memory_region(dimm);
@@ -1632,8 +1631,8 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
         goto out;
     }
 
-    pc_dimm_memory_plug(dev, &pcms->hotplug_memory, mr, align,
-                        pcmc->inter_dimm_gap, &local_err);
+    pc_dimm_memory_plug(dev, &pcms->hotplug_memory, mr, align, false,
+                        &local_err);
     if (local_err) {
         goto out;
     }
@@ -1953,7 +1952,6 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
     PCMachineClass *pcmc = PC_MACHINE_CLASS(oc);
     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
 
-    pcmc->inter_dimm_gap = true;
     pcmc->get_hotplug_handler = mc->get_hotplug_handler;
     mc->get_hotplug_handler = pc_get_hotpug_handler;
     mc->cpu_index_to_socket_id = pc_cpu_index_to_socket_id;

hw/i386/pc_piix.c

@@ -487,7 +487,6 @@ static void pc_i440fx_2_4_machine_options(MachineClass *m)
     m->alias = NULL;
     m->is_default = 0;
     pcmc->broken_reserved_end = true;
-    pcmc->inter_dimm_gap = false;
     SET_MACHINE_COMPAT(m, PC_COMPAT_2_4);
 }
 

hw/i386/pc_q35.c

@@ -385,7 +385,6 @@ static void pc_q35_2_4_machine_options(MachineClass *m)
     pc_q35_2_5_machine_options(m);
     m->alias = NULL;
     pcmc->broken_reserved_end = true;
-    pcmc->inter_dimm_gap = false;
     SET_MACHINE_COMPAT(m, PC_COMPAT_2_4);
 }
 

include/hw/i386/pc.h

@@ -60,7 +60,6 @@ struct PCMachineClass {
 
     /*< public >*/
     bool broken_reserved_end;
-    bool inter_dimm_gap;
     HotplugHandler *(*get_hotplug_handler)(MachineState *machine,
                                            DeviceState *dev);
 };