On 25.02.2016 17:22, Bharata B Rao wrote:
> Set up device tree entries for the hotplugged CPU core and use the
> exising EPOW event infrastructure to send CPU hotplug notification to
> the guest.
>
> Signed-off-by: Bharata B Rao <bhar...@linux.vnet.ibm.com>
> ---
> hw/ppc/spapr.c | 136
> ++++++++++++++++++++++++++++++++++++++++++++++++-
> hw/ppc/spapr_events.c | 3 ++
> hw/ppc/spapr_rtas.c | 24 +++++++++
> include/hw/ppc/spapr.h | 1 +
> 4 files changed, 163 insertions(+), 1 deletion(-)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 1f0d232..780cd00 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -603,6 +603,18 @@ static void spapr_populate_cpu_dt(CPUState *cs, void
> *fdt, int offset,
> size_t page_sizes_prop_size;
> uint32_t vcpus_per_socket = smp_threads * smp_cores;
> uint32_t pft_size_prop[] = {0, cpu_to_be32(spapr->htab_shift)};
> + sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(qdev_get_machine());
> + sPAPRDRConnector *drc;
> + sPAPRDRConnectorClass *drck;
> + int drc_index;
> +
> + if (smc->dr_cpu_enabled) {
> + drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, index);
> + g_assert(drc);
> + drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
> + drc_index = drck->get_index(drc);
> + _FDT((fdt_setprop_cell(fdt, offset, "ibm,my-drc-index", drc_index)));
> + }
>
> /* Note: we keep CI large pages off for now because a 64K capable guest
> * provisioned with large pages might otherwise try to map a qemu
> @@ -987,6 +999,16 @@ static void spapr_finalize_fdt(sPAPRMachineState *spapr,
> _FDT(spapr_drc_populate_dt(fdt, 0, NULL,
> SPAPR_DR_CONNECTOR_TYPE_LMB));
> }
>
> + if (smc->dr_cpu_enabled) {
> + int offset = fdt_path_offset(fdt, "/cpus");
> + ret = spapr_drc_populate_dt(fdt, offset, NULL,
> + SPAPR_DR_CONNECTOR_TYPE_CPU);
> + if (ret < 0) {
> + fprintf(stderr, "Couldn't set up CPU DR device tree
> properties\n");
I think it's better to use error_report() nowadays instead.
> + exit(1);
> + }
> + }
> +
> _FDT((fdt_pack(fdt)));
>
> if (fdt_totalsize(fdt) > FDT_MAX_SIZE) {
> @@ -1759,6 +1781,7 @@ static void ppc_spapr_init(MachineState *machine)
> char *filename;
> int spapr_cores = smp_cpus / smp_threads;
> int spapr_max_cores = max_cpus / smp_threads;
> + int smt = kvmppc_smt_threads();
>
> msi_supported = true;
>
> @@ -1813,6 +1836,15 @@ static void ppc_spapr_init(MachineState *machine)
> spapr_validate_node_memory(machine, &error_fatal);
> }
>
> + if (smc->dr_cpu_enabled) {
> + for (i = 0; i < spapr_max_cores; i++) {
> + sPAPRDRConnector *drc =
> + spapr_dr_connector_new(OBJECT(spapr),
> + SPAPR_DR_CONNECTOR_TYPE_CPU, i * smt);
> + qemu_register_reset(spapr_drc_reset, drc);
> + }
> + }
> +
> /* init CPUs */
> if (machine->cpu_model == NULL) {
> machine->cpu_model = kvm_enabled() ? "host" : "POWER7";
> @@ -2247,6 +2279,88 @@ out:
> error_propagate(errp, local_err);
> }
>
> +static void *spapr_populate_hotplug_cpu_dt(DeviceState *dev, CPUState *cs,
> + int *fdt_offset,
> + sPAPRMachineState *spapr)
> +{
> + PowerPCCPU *cpu = POWERPC_CPU(cs);
> + DeviceClass *dc = DEVICE_GET_CLASS(cs);
> + int id = ppc_get_vcpu_dt_id(cpu);
> + void *fdt;
> + int offset, fdt_size;
> + char *nodename;
> +
> + fdt = create_device_tree(&fdt_size);
> + nodename = g_strdup_printf("%s@%x", dc->fw_name, id);
> + offset = fdt_add_subnode(fdt, 0, nodename);
> +
> + spapr_populate_cpu_dt(cs, fdt, offset, spapr);
> + g_free(nodename);
> +
> + *fdt_offset = offset;
> + return fdt;
> +}
> +
> +static void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> + Error **errp)
> +{
> + sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(qdev_get_machine());
> + sPAPRMachineState *ms = SPAPR_MACHINE(qdev_get_machine());
> + sPAPRCPUCore *core = SPAPR_CPU_CORE(OBJECT(dev));
> + PowerPCCPU *cpu = &core->threads[0];
> + CPUState *cs = CPU(cpu);
> + int id = ppc_get_vcpu_dt_id(cpu);
> + sPAPRDRConnector *drc =
> + spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, id);
> + sPAPRDRConnectorClass *drck;
> + Error *local_err = NULL;
> + void *fdt = NULL;
> + int fdt_offset = 0;
> +
> + if (!smc->dr_cpu_enabled) {
> + /*
> + * This is a cold plugged CPU core but the machine doesn't support
> + * DR. So skip the hotplug path ensuring that the core is brought
> + * up online with out an associated DR connector.
> + */
> + return;
> + }
> +
> + g_assert(drc);
> +
> + /*
> + * Setup CPU DT entries only for hotplugged CPUs. For boot time or
> + * coldplugged CPUs DT entries are setup in spapr_finalize_fdt().
> + */
> + if (dev->hotplugged) {
> + fdt = spapr_populate_hotplug_cpu_dt(dev, cs, &fdt_offset, ms);
> + dev->hotplugged = true;
That looks strange ... why "dev->hotplugged = true" after you've already
checked that with the above if-statement?
> + }
> +
> + drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
> + drck->attach(drc, dev, fdt, fdt_offset, !dev->hotplugged, &local_err);
> + if (local_err) {
> + g_free(fdt);
> + error_propagate(errp, local_err);
> + return;
> + }
> +
> + if (dev->hotplugged) {
> + /*
> + * Send hotplug notification interrupt to the guest only in case
> + * of hotplugged CPUs.
> + */
> + spapr_hotplug_req_add_by_index(drc);
> + } else {
> + /*
> + * Set the right DRC states for cold plugged CPU.
> + */
> + drck->set_allocation_state(drc, SPAPR_DR_ALLOCATION_STATE_USABLE);
> + drck->set_isolation_state(drc, SPAPR_DR_ISOLATION_STATE_UNISOLATED);
> + }
> + return;
Superfluous return statement.
> +}
> +
> static void spapr_machine_device_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev, Error **errp)
> {
> @@ -2291,8 +2405,25 @@ static void spapr_machine_device_plug(HotplugHandler
> *hotplug_dev,
> } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
> CPUState *cs = CPU(dev);
> PowerPCCPU *cpu = POWERPC_CPU(cs);
> + int i;
> +
> + if (!smc->dr_cpu_enabled && dev->hotplugged) {
> + error_setg(errp, "CPU hotplug not supported for this machine");
> + return;
> + }
> +
> + /* Set NUMA node for the added CPUs */
> + for (i = 0; i < nb_numa_nodes; i++) {
> + if (test_bit(cs->cpu_index, numa_info[i].node_cpu)) {
> + cs->numa_node = i;
> + break;
> + }
> + }
>
> spapr_cpu_init(ms, cpu, errp);
> + spapr_cpu_reset(cpu);
> + } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
> + spapr_core_plug(hotplug_dev, dev, errp);
> }
> }
>
> @@ -2308,7 +2439,8 @@ static HotplugHandler
> *spapr_get_hotpug_handler(MachineState *machine,
> DeviceState *dev)
> {
> if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
> - object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
> + object_dynamic_cast(OBJECT(dev), TYPE_CPU) ||
> + object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
> return HOTPLUG_HANDLER(machine);
> }
> return NULL;
> @@ -2352,6 +2484,7 @@ static void spapr_machine_class_init(ObjectClass *oc,
> void *data)
> 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;
> }
> @@ -2431,6 +2564,7 @@ static void
> spapr_machine_2_5_class_options(MachineClass *mc)
>
> spapr_machine_2_6_class_options(mc);
> smc->use_ohci_by_default = true;
> + smc->dr_cpu_enabled = false;
> SET_MACHINE_COMPAT(mc, SPAPR_COMPAT_2_5);
> }
>
Thomas
