spapr_pci: add dynamic-reconfiguration option for spapr-pci-host-bridge

This option enables/disables PCI hotplug for a particular PHB.

Also add machine compatibility code to disable it by default for machine
types prior to pseries-2.4.
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
[agraf: move commas for compat fields]
Signed-off-by: NAlexander Graf <agraf@suse.de>

hw/ppc/spapr.c

@@ -1823,7 +1823,12 @@ static const TypeInfo spapr_machine_info = {
 };
 
 #define SPAPR_COMPAT_2_3 \
-        HW_COMPAT_2_3
+        HW_COMPAT_2_3 \
+        {\
+            .driver   = "spapr-pci-host-bridge",\
+            .property = "dynamic-reconfiguration",\
+            .value    = "off",\
+        },
 
 #define SPAPR_COMPAT_2_2 \
         SPAPR_COMPAT_2_3 \
@@ -1913,7 +1918,7 @@ static const TypeInfo spapr_machine_2_2_info = {
 static void spapr_machine_2_3_class_init(ObjectClass *oc, void *data)
 {
     static GlobalProperty compat_props[] = {
-        /* SPAPR_COMPAT_2_3, */
+        SPAPR_COMPAT_2_3
         { /* end of list */ }
     };
     MachineClass *mc = MACHINE_CLASS(oc);

hw/ppc/spapr_pci.c

@@ -936,6 +936,8 @@ static Property spapr_phb_properties[] = {
     DEFINE_PROP_UINT64("io_win_addr", sPAPRPHBState, io_win_addr, -1),
     DEFINE_PROP_UINT64("io_win_size", sPAPRPHBState, io_win_size,
                        SPAPR_PCI_IO_WIN_SIZE),
+    DEFINE_PROP_BOOL("dynamic-reconfiguration", sPAPRPHBState, dr_enabled,
+                     true),
     DEFINE_PROP_END_OF_LIST(),
 };
 

include/hw/pci-host/spapr.h

@@ -71,6 +71,7 @@ struct sPAPRPHBState {
     uint32_t index;
     uint64_t buid;
     char *dtbusname;
+    bool dr_enabled;
 
     MemoryRegion memspace, iospace;
     hwaddr mem_win_addr, mem_win_size, io_win_addr, io_win_size;