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

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting Bharata B Rao (2015-01-08 00:10:08)
> 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]

Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>

> ---
>  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