On Fri, Mar 04, 2016 at 12:24:19PM +0530, 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 | 73
> ++++++++++++++++++++++++++++++++++++++++-
> hw/ppc/spapr_cpu_core.c | 60 +++++++++++++++++++++++++++++++++
> hw/ppc/spapr_events.c | 3 ++
> hw/ppc/spapr_rtas.c | 24 ++++++++++++++
> include/hw/ppc/spapr.h | 4 +++
> include/hw/ppc/spapr_cpu_core.h | 2 ++
> 6 files changed, 165 insertions(+), 1 deletion(-)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 5acb612..6c4ac50 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) {
> + error_report("Couldn't set up CPU DR device tree properties");
> + exit(1);
> + }
> + }
> +
> _FDT((fdt_pack(fdt)));
>
> if (fdt_totalsize(fdt) > FDT_MAX_SIZE) {
> @@ -1181,7 +1203,7 @@ static void ppc_spapr_reset(void)
>
> }
>
> -static void spapr_cpu_reset(void *opaque)
> +void spapr_cpu_reset(void *opaque)
> {
> sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
> PowerPCCPU *cpu = opaque;
> @@ -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;
> + }
> + }
> +
This hunk seems like it belongs in a different patch.
> xics_cpu_setup(spapr->icp, cpu);
> qemu_register_reset(spapr_cpu_reset, cpu);
> }
> @@ -1768,6 +1800,7 @@ 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();
>
> if (smp_cpus % smp_threads) {
> error_report("smp_cpus (%u) must be multiple of threads (%u)",
> @@ -1834,6 +1867,15 @@ 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);
> + }
> + }
> +
Nit: would this be cleaner to include in the same loop that constructs
the (empty) links and boot-time cpu cores?
> /* init CPUs */
> if (machine->cpu_model == NULL) {
> machine->cpu_model = kvm_enabled() ? "host" : "POWER7";
> @@ -2267,6 +2309,27 @@ 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)
> {
> @@ -2307,6 +2370,12 @@ 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);
> }
> }
>
> @@ -2366,6 +2435,7 @@ 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;
> }
> @@ -2445,6 +2515,7 @@ 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);
> }
>
> diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
> index 9ddf3ce..4c233d7 100644
> --- a/hw/ppc/spapr_cpu_core.c
> +++ b/hw/ppc/spapr_cpu_core.c
> @@ -14,6 +14,65 @@
> #include "qapi/visitor.h"
> #include <sysemu/cpus.h>
>
> +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;
> + }
> +
> + 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);
> + }
> +}
> +
> static int spapr_cpu_core_realize_child(Object *child, void *opaque)
> {
> Error **errp = opaque;
> @@ -30,6 +89,7 @@ static int spapr_cpu_core_realize_child(Object *child, void
> *opaque)
> if (*errp) {
> return 1;
> }
> + spapr_cpu_reset(cpu);
This also looks like it belongs in a different patch.
> return 0;
> }
> 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 06e6cec..d1a0af8 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -36,6 +36,7 @@ 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 */
> };
>
> @@ -589,6 +590,9 @@ 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_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 ddaff6f..9879398 100644
> --- a/include/hw/ppc/spapr_cpu_core.h
> +++ b/include/hw/ppc/spapr_cpu_core.h
> @@ -26,4 +26,6 @@ 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
signature.asc
Description: PGP signature
