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Re: [Qemu-devel] [RFC PATCH v2.1 10/12] spapr: CPU hotplug support
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From: |
Igor Mammedov |
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Subject: |
Re: [Qemu-devel] [RFC PATCH v2.1 10/12] spapr: CPU hotplug support |
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Date: |
Fri, 6 May 2016 10:57:21 +0200 |
On Thu, 31 Mar 2016 14:09:19 +0530
Bharata B Rao <address@hidden> wrote:
> Set up device tree entries for the hotplugged CPU core and use the
> exising RTAS event logging infrastructure to send CPU hotplug notification
> to the guest.
perhaps you could reuse:
[RFC,20/42] machine: add cpu-hotplug machine option
http://patchwork.ozlabs.org/patch/617516/
to enable cpu hotplug explicitly,
and by default machine would be hotplug less saving resources.
>
> Signed-off-by: Bharata B Rao <address@hidden>
> ---
> hw/ppc/spapr.c | 58 ++++++++++++++++++++++++++++++++++
> hw/ppc/spapr_cpu_core.c | 70
> +++++++++++++++++++++++++++++++++++++++++
> hw/ppc/spapr_events.c | 3 ++
> hw/ppc/spapr_rtas.c | 24 ++++++++++++++
> include/hw/ppc/spapr.h | 2 ++
> include/hw/ppc/spapr_cpu_core.h | 2 ++
> 6 files changed, 159 insertions(+)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 1ead043..1a5dbd9 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -603,6 +603,16 @@ 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)};
> + sPAPRDRConnector *drc;
> + sPAPRDRConnectorClass *drck;
> + int drc_index;
> +
> + drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, index);
> + if (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 +997,16 @@ 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) {
> + error_report("Couldn't set up CPU DR device tree properties");
> + exit(1);
> + }
> + }
> +
> _FDT((fdt_pack(fdt)));
>
> if (fdt_totalsize(fdt) > FDT_MAX_SIZE) {
> @@ -1622,6 +1642,8 @@ static void spapr_boot_set(void *opaque, const char
> *boot_device,
> void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu, Error **errp)
> {
> CPUPPCState *env = &cpu->env;
> + CPUState *cs = CPU(cpu);
> + int i;
>
> /* Set time-base frequency to 512 MHz */
> cpu_ppc_tb_init(env, TIMEBASE_FREQ);
> @@ -1646,6 +1668,14 @@ void spapr_cpu_init(sPAPRMachineState *spapr,
> PowerPCCPU *cpu, Error **errp)
> }
> }
>
> + /* 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;
> + }
> + }
> +
> xics_cpu_setup(spapr->icp, cpu);
>
> qemu_register_reset(spapr_cpu_reset, cpu);
> @@ -1825,6 +1855,11 @@ static void ppc_spapr_init(MachineState *machine)
>
> for (i = 0; i < spapr_max_cores; i++) {
> int core_dt_id = i * smt;
> + sPAPRDRConnector *drc =
> + spapr_dr_connector_new(OBJECT(spapr),
> + SPAPR_DR_CONNECTOR_TYPE_CPU,
> core_dt_id);
> +
> + qemu_register_reset(spapr_drc_reset, drc);
>
> if (i < spapr_cores) {
> char *type = spapr_get_cpu_core_type(machine->cpu_model);
> @@ -2247,6 +2282,27 @@ out:
> error_propagate(errp, local_err);
> }
>
> +void *spapr_populate_hotplug_cpu_dt(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("address@hidden", 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_machine_device_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev, Error **errp)
> {
> @@ -2287,6 +2343,8 @@ static void spapr_machine_device_plug(HotplugHandler
> *hotplug_dev,
> }
>
> spapr_memory_plug(hotplug_dev, dev, node, errp);
> + } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
> + spapr_core_plug(hotplug_dev, dev, errp);
> }
> }
>
> diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
> index 640d143..a9ba843 100644
> --- a/hw/ppc/spapr_cpu_core.c
> +++ b/hw/ppc/spapr_cpu_core.c
> @@ -18,6 +18,7 @@
> void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> Error **errp)
> {
> + sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(qdev_get_machine());
> sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
looks like hotplug_dev is machine,
so why don't just cast it instead of qdev_get_machine().
the same applies to other plug handlers.
> int spapr_max_cores = max_cpus / smp_threads;
> int index;
> @@ -25,6 +26,11 @@ void spapr_core_pre_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev,
> Error *local_err = NULL;
> CPUCore *cc = CPU_CORE(dev);
>
> + if (!smc->dr_cpu_enabled && dev->hotplugged) {
> + error_setg(&local_err, "CPU hotplug not supported for this machine");
> + goto out;
> + }
> +
> if (cc->threads != smp_threads) {
> error_setg(&local_err, "threads must be %d", smp_threads);
> goto out;
> @@ -49,6 +55,70 @@ out:
> error_propagate(errp, local_err);
> }
>
> +void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> + Error **errp)
> +{
> + sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(qdev_get_machine());
> + sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
> + sPAPRCPUCore *core = SPAPR_CPU_CORE(OBJECT(dev));
> + CPUCore *cc = CPU_CORE(dev);
> + CPUState *cs = CPU(&core->threads[0]);
> + sPAPRDRConnector *drc;
> + sPAPRDRConnectorClass *drck;
> + Error *local_err = NULL;
> + void *fdt = NULL;
> + int fdt_offset = 0;
> + int index;
> + int smt = kvmppc_smt_threads();
> +
> + drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, cc->core);
> + index = cc->core / smt;
> + spapr->cores[index] = OBJECT(dev);
> +
> + 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(cs, &fdt_offset, spapr);
> + dev->hotplugged = true;
> + }
> +
> + drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
> + drck->attach(drc, dev, fdt, fdt_offset, !dev->hotplugged, &local_err);
> + if (local_err) {
> + g_free(fdt);
> + spapr->cores[index] = NULL;
> + 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);
> + }
> +}
> +
> static const TypeInfo spapr_cpu_core_type_info = {
> .name = TYPE_SPAPR_CPU_CORE,
> .parent = TYPE_CPU_CORE,
> diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
> index 39f4682..10340e1 100644
> --- a/hw/ppc/spapr_events.c
> +++ b/hw/ppc/spapr_events.c
> @@ -437,6 +437,9 @@ static void spapr_hotplug_req_event(uint8_t hp_id,
> uint8_t hp_action,
> case SPAPR_DR_CONNECTOR_TYPE_LMB:
> hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_MEMORY;
> break;
> + case SPAPR_DR_CONNECTOR_TYPE_CPU:
> + hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_CPU;
> + break;
> default:
> /* we shouldn't be signaling hotplug events for resources
> * that don't support them
> diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
> index b7c5ebd..cc0369e 100644
> --- a/hw/ppc/spapr_rtas.c
> +++ b/hw/ppc/spapr_rtas.c
> @@ -34,6 +34,7 @@
>
> #include "hw/ppc/spapr.h"
> #include "hw/ppc/spapr_vio.h"
> +#include "hw/ppc/ppc.h"
> #include "qapi-event.h"
> #include "hw/boards.h"
>
> @@ -161,6 +162,27 @@ static void rtas_query_cpu_stopped_state(PowerPCCPU
> *cpu_,
> rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
> }
>
> +/*
> + * Set the timebase offset of the CPU to that of first CPU.
> + * This helps hotplugged CPU to have the correct timebase offset.
> + */
> +static void spapr_cpu_update_tb_offset(PowerPCCPU *cpu)
> +{
> + PowerPCCPU *fcpu = POWERPC_CPU(first_cpu);
> +
> + cpu->env.tb_env->tb_offset = fcpu->env.tb_env->tb_offset;
> +}
> +
> +static void spapr_cpu_set_endianness(PowerPCCPU *cpu)
> +{
> + PowerPCCPU *fcpu = POWERPC_CPU(first_cpu);
> + PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(fcpu);
> +
> + if (!pcc->interrupts_big_endian(fcpu)) {
> + cpu->env.spr[SPR_LPCR] |= LPCR_ILE;
> + }
> +}
> +
> static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPRMachineState *spapr,
> uint32_t token, uint32_t nargs,
> target_ulong args,
> @@ -197,6 +219,8 @@ static void rtas_start_cpu(PowerPCCPU *cpu_,
> sPAPRMachineState *spapr,
> env->nip = start;
> env->gpr[3] = r3;
> cs->halted = 0;
> + spapr_cpu_set_endianness(cpu);
> + spapr_cpu_update_tb_offset(cpu);
>
> qemu_cpu_kick(cs);
>
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index a6956c0..619db98 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -588,6 +588,8 @@ void spapr_hotplug_req_add_by_count(sPAPRDRConnectorType
> drc_type,
> void spapr_hotplug_req_remove_by_count(sPAPRDRConnectorType drc_type,
> uint32_t count);
> void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu, Error **errp);
> +void *spapr_populate_hotplug_cpu_dt(CPUState *cs, int *fdt_offset,
> + sPAPRMachineState *spapr);
>
> /* rtas-configure-connector state */
> struct sPAPRConfigureConnectorState {
> diff --git a/include/hw/ppc/spapr_cpu_core.h b/include/hw/ppc/spapr_cpu_core.h
> index f08f291..165af7c 100644
> --- a/include/hw/ppc/spapr_cpu_core.h
> +++ b/include/hw/ppc/spapr_cpu_core.h
> @@ -63,4 +63,6 @@ typedef struct POWER8sPAPRCPUCore {
> void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> Error **errp);
> char *spapr_get_cpu_core_type(const char *model);
> +void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> + Error **errp);
> #endif