[Qemu-devel] [RFC PATCH v1 01/13] spapr: enable PHB/CPU/LMB hotplug for pseries-2.3

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

From: Michael Roth <mdroth@linux.vnet.ibm.com>

Introduce an sPAPRMachineClass sub-class of MachineClass to
handle sPAPR-specific machine configuration properties.

The 'dr_phb[cpu,lmb]_enabled' field of that class can be set as
part of machine-specific init code, and is then propagated
to sPAPREnvironment to conditional enable creation of DRC
objects and device-tree description to facilitate hotplug
of PHBs/CPUs/LMBs.

Since we can't migrate this state to older machine types,
default the option to false and only enable it for new
machine types.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
              [Added CPU and LMB bits]
---
 hw/ppc/spapr.c         | 32 ++++++++++++++++++++++++++++++++
 include/hw/ppc/spapr.h |  3 +++
 2 files changed, 35 insertions(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 9eb0a94..71e7052 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -89,11 +89,29 @@
 
 #define HTAB_SIZE(spapr)        (1ULL << ((spapr)->htab_shift))
 
+typedef struct sPAPRMachineClass sPAPRMachineClass;
 typedef struct sPAPRMachineState sPAPRMachineState;
 
 #define TYPE_SPAPR_MACHINE      "spapr-machine"
 #define SPAPR_MACHINE(obj) \
     OBJECT_CHECK(sPAPRMachineState, (obj), TYPE_SPAPR_MACHINE)
+#define SPAPR_MACHINE_GET_CLASS(obj) \
+        OBJECT_GET_CLASS(sPAPRMachineClass, obj, TYPE_SPAPR_MACHINE)
+#define SPAPR_MACHINE_CLASS(klass) \
+        OBJECT_CLASS_CHECK(sPAPRMachineClass, klass, TYPE_SPAPR_MACHINE)
+
+/**
+ * sPAPRMachineClass:
+ */
+struct sPAPRMachineClass {
+    /*< private >*/
+    MachineClass parent_class;
+
+    /*< public >*/
+    bool dr_phb_enabled; /* enable dynamic-reconfig/hotplug of PHBs */
+    bool dr_cpu_enabled; /* enable dynamic-reconfig/hotplug of CPUs */
+    bool dr_lmb_enabled; /* enable dynamic-reconfig/hotplug of LMBs */
+};
 
 /**
  * sPAPRMachineState:
@@ -1343,6 +1361,7 @@ static SaveVMHandlers savevm_htab_handlers = {
 /* pSeries LPAR / sPAPR hardware init */
 static void ppc_spapr_init(MachineState *machine)
 {
+    sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(machine);
     ram_addr_t ram_size = machine->ram_size;
     const char *cpu_model = machine->cpu_model;
     const char *kernel_filename = machine->kernel_filename;
@@ -1503,6 +1522,10 @@ static void ppc_spapr_init(MachineState *machine)
     /* We always have at least the nvram device on VIO */
     spapr_create_nvram(spapr);
 
+    spapr->dr_phb_enabled = smc->dr_phb_enabled;
+    spapr->dr_cpu_enabled = smc->dr_cpu_enabled;
+    spapr->dr_lmb_enabled = smc->dr_lmb_enabled;
+
     /* Set up PCI */
     spapr_pci_rtas_init();
 
@@ -1722,6 +1745,7 @@ static void spapr_nmi(NMIState *n, int cpu_index, Error **errp)
 static void spapr_machine_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(oc);
     FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(oc);
     NMIClass *nc = NMI_CLASS(oc);
 
@@ -1733,6 +1757,9 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
     mc->default_boot_order = NULL;
     mc->kvm_type = spapr_kvm_type;
     mc->has_dynamic_sysbus = true;
+    smc->dr_phb_enabled = false;
+    smc->dr_cpu_enabled = false;
+    smc->dr_lmb_enabled = false;
 
     fwc->get_dev_path = spapr_get_fw_dev_path;
     nc->nmi_monitor_handler = spapr_nmi;
@@ -1744,6 +1771,7 @@ static const TypeInfo spapr_machine_info = {
     .abstract      = true,
     .instance_size = sizeof(sPAPRMachineState),
     .instance_init = spapr_machine_initfn,
+    .class_size    = sizeof(sPAPRMachineClass),
     .class_init    = spapr_machine_class_init,
     .interfaces = (InterfaceInfo[]) {
         { TYPE_FW_PATH_PROVIDER },
@@ -1788,11 +1816,15 @@ static const TypeInfo spapr_machine_2_2_info = {
 static void spapr_machine_2_3_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(oc);
 
     mc->name = "pseries-2.3";
     mc->desc = "pSeries Logical Partition (PAPR compliant) v2.3";
     mc->alias = "pseries";
     mc->is_default = 1;
+    smc->dr_phb_enabled = true;
+    smc->dr_cpu_enabled = true;
+    smc->dr_lmb_enabled = true;
 }
 
 static const TypeInfo spapr_machine_2_3_info = {
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 973193d..b1a0838 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -30,6 +30,9 @@ typedef struct sPAPREnvironment {
     uint64_t rtc_offset;
     struct PPCTimebase tb;
     bool has_graphics;
+    bool dr_phb_enabled; /* hotplug / dynamic-reconfiguration of PHBs */
+    bool dr_cpu_enabled; /* hotplug / dynamic-reconfiguration of CPUs */
+    bool dr_lmb_enabled; /* hotplug / dynamic-reconfiguration of LMBs */
 
     uint32_t check_exception_irq;
     Notifier epow_notifier;
-- 
2.1.0