From 94a94e4c49197d10e5ee7710bb0538ddeff75ba9 Mon Sep 17 00:00:00 2001 From: Bharata B Rao Date: Fri, 10 Jun 2016 06:29:03 +0530 Subject: [PATCH] spapr: convert boot CPUs into CPU core devices Introduce sPAPRMachineClass.dr_cpu_enabled to indicate support for CPU core hotplug. Initialize boot time CPUs as core deivces and prevent topologies that result in partially filled cores. Both of these are done only if CPU core hotplug is supported. Note: An unrelated change in the call to xics_system_init() is done in this patch as it makes sense to use the local variable smt introduced in this patch instead of kvmppc_smt_threads() call here. TODO: We derive sPAPR core type by looking at -cpu . However we don't take care of "compat=" feature yet for boot time as well as hotplug CPUs. Signed-off-by: Bharata B Rao Reviewed-by: David Gibson Signed-off-by: David Gibson --- hw/ppc/spapr.c | 73 ++++++++++++++++++++++++++++----- hw/ppc/spapr_cpu_core.c | 58 ++++++++++++++++++++++++++ include/hw/ppc/spapr.h | 2 + include/hw/ppc/spapr_cpu_core.h | 3 ++ 4 files changed, 126 insertions(+), 10 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index b04a3892ea..52e89afd15 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -66,6 +66,7 @@ #include "hw/compat.h" #include "qemu/cutils.h" +#include "hw/ppc/spapr_cpu_core.h" #include @@ -1683,7 +1684,6 @@ static void ppc_spapr_init(MachineState *machine) const char *kernel_filename = machine->kernel_filename; const char *kernel_cmdline = machine->kernel_cmdline; const char *initrd_filename = machine->initrd_filename; - PowerPCCPU *cpu; PCIHostState *phb; int i; MemoryRegion *sysmem = get_system_memory(); @@ -1697,6 +1697,22 @@ static void ppc_spapr_init(MachineState *machine) long load_limit, fw_size; bool kernel_le = false; char *filename; + int smt = kvmppc_smt_threads(); + int spapr_cores = smp_cpus / smp_threads; + int spapr_max_cores = max_cpus / smp_threads; + + if (smc->dr_cpu_enabled) { + if (smp_cpus % smp_threads) { + error_report("smp_cpus (%u) must be multiple of threads (%u)", + smp_cpus, smp_threads); + exit(1); + } + if (max_cpus % smp_threads) { + error_report("max_cpus (%u) must be multiple of threads (%u)", + max_cpus, smp_threads); + exit(1); + } + } msi_nonbroken = true; @@ -1743,8 +1759,7 @@ static void ppc_spapr_init(MachineState *machine) /* Set up Interrupt Controller before we create the VCPUs */ spapr->icp = xics_system_init(machine, - DIV_ROUND_UP(max_cpus * kvmppc_smt_threads(), - smp_threads), + DIV_ROUND_UP(max_cpus * smt, smp_threads), XICS_IRQS, &error_fatal); if (smc->dr_lmb_enabled) { @@ -1755,13 +1770,37 @@ static void ppc_spapr_init(MachineState *machine) if (machine->cpu_model == NULL) { machine->cpu_model = kvm_enabled() ? "host" : "POWER7"; } - for (i = 0; i < smp_cpus; i++) { - cpu = cpu_ppc_init(machine->cpu_model); - if (cpu == NULL) { - error_report("Unable to find PowerPC CPU definition"); - exit(1); + + if (smc->dr_cpu_enabled) { + char *type = spapr_get_cpu_core_type(machine->cpu_model); + + spapr->cores = g_new0(Object *, spapr_max_cores); + for (i = 0; i < spapr_cores; i++) { + int core_dt_id = i * smt; + Object *core; + + if (!object_class_by_name(type)) { + error_report("Unable to find sPAPR CPU Core definition"); + exit(1); + } + + core = object_new(type); + object_property_set_int(core, smp_threads, "nr-threads", + &error_fatal); + object_property_set_int(core, core_dt_id, CPU_CORE_PROP_CORE_ID, + &error_fatal); + object_property_set_bool(core, true, "realized", &error_fatal); } - spapr_cpu_init(spapr, cpu, &error_fatal); + g_free(type); + } else { + for (i = 0; i < smp_cpus; i++) { + PowerPCCPU *cpu = cpu_ppc_init(machine->cpu_model); + if (cpu == NULL) { + error_report("Unable to find PowerPC CPU definition"); + exit(1); + } + spapr_cpu_init(spapr, cpu, &error_fatal); + } } if (kvm_enabled()) { @@ -2227,10 +2266,19 @@ static void spapr_machine_device_unplug(HotplugHandler *hotplug_dev, } } +static void spapr_machine_device_pre_plug(HotplugHandler *hotplug_dev, + DeviceState *dev, Error **errp) +{ + if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) { + spapr_core_pre_plug(hotplug_dev, dev, errp); + } +} + static HotplugHandler *spapr_get_hotpug_handler(MachineState *machine, DeviceState *dev) { - if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) { + if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) || + object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) { return HOTPLUG_HANDLER(machine); } return NULL; @@ -2269,11 +2317,13 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data) mc->has_dynamic_sysbus = true; mc->pci_allow_0_address = true; mc->get_hotplug_handler = spapr_get_hotpug_handler; + hc->pre_plug = spapr_machine_device_pre_plug; hc->plug = spapr_machine_device_plug; hc->unplug = spapr_machine_device_unplug; mc->cpu_index_to_socket_id = spapr_cpu_index_to_socket_id; smc->dr_lmb_enabled = true; + smc->dr_cpu_enabled = true; fwc->get_dev_path = spapr_get_fw_dev_path; nc->nmi_monitor_handler = spapr_nmi; } @@ -2349,7 +2399,10 @@ static void spapr_machine_2_6_instance_options(MachineState *machine) static void spapr_machine_2_6_class_options(MachineClass *mc) { + sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(mc); + spapr_machine_2_7_class_options(mc); + smc->dr_cpu_enabled = false; SET_MACHINE_COMPAT(mc, SPAPR_COMPAT_2_6); } diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c index 2e24e3999c..d747c26982 100644 --- a/hw/ppc/spapr_cpu_core.c +++ b/hw/ppc/spapr_cpu_core.c @@ -63,6 +63,64 @@ void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu, Error **errp) qemu_register_reset(spapr_cpu_reset, cpu); } +/* + * Return the sPAPR CPU core type for @model which essentially is the CPU + * model specified with -cpu cmdline option. + */ +char *spapr_get_cpu_core_type(const char *model) +{ + char *core_type; + gchar **model_pieces = g_strsplit(model, ",", 2); + + core_type = g_strdup_printf("%s-%s", model_pieces[0], TYPE_SPAPR_CPU_CORE); + g_strfreev(model_pieces); + return core_type; +} + +void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev, + Error **errp) +{ + MachineState *machine = MACHINE(OBJECT(hotplug_dev)); + sPAPRMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev)); + int spapr_max_cores = max_cpus / smp_threads; + int index; + int smt = kvmppc_smt_threads(); + Error *local_err = NULL; + CPUCore *cc = CPU_CORE(dev); + char *base_core_type = spapr_get_cpu_core_type(machine->cpu_model); + const char *type = object_get_typename(OBJECT(dev)); + + if (strcmp(base_core_type, type)) { + error_setg(&local_err, "CPU core type should be %s", base_core_type); + goto out; + } + + if (cc->nr_threads != smp_threads) { + error_setg(&local_err, "threads must be %d", smp_threads); + goto out; + } + + if (cc->core_id % smt) { + error_setg(&local_err, "invalid core id %d\n", cc->core_id); + goto out; + } + + index = cc->core_id / smt; + if (index < 0 || index >= spapr_max_cores) { + error_setg(&local_err, "core id %d out of range", cc->core_id); + goto out; + } + + if (spapr->cores[index]) { + error_setg(&local_err, "core %d already populated", cc->core_id); + goto out; + } + +out: + g_free(base_core_type); + error_propagate(errp, local_err); +} + static int spapr_cpu_core_realize_child(Object *child, void *opaque) { Error **errp = opaque; diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 3277692bff..2a892bddbd 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -38,6 +38,7 @@ struct sPAPRMachineClass { /*< public >*/ bool dr_lmb_enabled; /* enable dynamic-reconfig/hotplug of LMBs */ + bool dr_cpu_enabled; /* enable dynamic-reconfig/hotplug of CPUs */ bool use_ohci_by_default; /* use USB-OHCI instead of XHCI */ }; @@ -81,6 +82,7 @@ struct sPAPRMachineState { /*< public >*/ char *kvm_type; MemoryHotplugState hotplug_memory; + Object **cores; }; #define H_SUCCESS 0 diff --git a/include/hw/ppc/spapr_cpu_core.h b/include/hw/ppc/spapr_cpu_core.h index 424edeccc9..401381b531 100644 --- a/include/hw/ppc/spapr_cpu_core.h +++ b/include/hw/ppc/spapr_cpu_core.h @@ -26,4 +26,7 @@ typedef struct sPAPRCPUCore { ObjectClass *cpu_class; } sPAPRCPUCore; +void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev, + Error **errp); +char *spapr_get_cpu_core_type(const char *model); #endif