On Fri, Mar 11, 2016 at 10:24:36AM +0530, Bharata B Rao 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.
>
> Signed-off-by: Bharata B Rao <bhar...@linux.vnet.ibm.com>
> ---
> hw/ppc/spapr.c | 64 ++++++++++++++++++++++++++++++++++++++
> hw/ppc/spapr_cpu_core.c | 69
> +++++++++++++++++++++++++++++++++++++++++
> 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, 164 insertions(+)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index cffe8c8..822c87d 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);
Small nit: rather than asserting here it might be simpler to just
check for drc != NULL instead of checking smc->dr_cpu_enabled. That
should have the same effect for now, and will be correct if we ever
have some pluggable and some non-pluggable CPUs...
> + 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) {
> + 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 +1644,8 @@ 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 +1670,14 @@ 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);
> @@ -1824,6 +1856,11 @@ 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);
...at least it will be if you make construction of the DRC object
conditional on dr_cpu_enabled.
> if (i < spapr_cores) {
> Object *core = object_new(TYPE_SPAPR_CPU_CORE);
> @@ -2246,6 +2283,27 @@ out:
> error_propagate(errp, local_err);
> }
>
> +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_machine_device_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev, Error **errp)
> {
> @@ -2286,6 +2344,12 @@ 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)) {
> + if (!smc->dr_cpu_enabled && dev->hotplugged) {
> + error_setg(errp, "CPU hotplug not supported for this machine");
> + return;
> + }
> + spapr_core_plug(hotplug_dev, dev, errp);
> }
> }
>
> diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
> index 8c6d71d..db8de32 100644
> --- a/hw/ppc/spapr_cpu_core.c
> +++ b/hw/ppc/spapr_cpu_core.c
> @@ -15,6 +15,75 @@
> #include <sysemu/cpus.h>
> #include "target-ppc/kvm_ppc.h"
>
> +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));
> + CPUState *cs = CPU(&core->threads[0]);
> + sPAPRDRConnector *drc;
> + sPAPRDRConnectorClass *drck;
> + Error *local_err = NULL;
> + void *fdt = NULL;
> + int fdt_offset = 0;
> + int core_id, core_dt_id;
> + int smt = kvmppc_smt_threads();
> +
> + /* TODO: Should we cache core_id in sPAPRCPUCore ? */
> + core_dt_id = object_property_get_int(OBJECT(dev), "core",
> &local_err);
As Igor pointed out elsewhere you should just be able to do
CPU_CORE(dev)->core.
> + if (local_err) {
> + error_propagate(errp, local_err);
> + return;
> + }
> + drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, core_dt_id);
> + core_id = core_dt_id / smt;
> + spapr->cores[core_id] = 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(dev, 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[core_id] = 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 void spapr_cpu_core_create_threads(sPAPRCPUCore *core, int threads,
> Error **errp)
> {
> 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 c099c3c..8957072 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -589,6 +589,8 @@ 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_cpu_reset(void *opaque);
> +void *spapr_populate_hotplug_cpu_dt(DeviceState *dev, 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 48fb76a..980d8ae 100644
> --- a/include/hw/ppc/spapr_cpu_core.h
> +++ b/include/hw/ppc/spapr_cpu_core.h
> @@ -25,4 +25,6 @@ typedef struct sPAPRCPUCore {
> PowerPCCPU *threads;
> } sPAPRCPUCore;
>
> +void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> + Error **errp);
> #endif
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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