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Re: [Qemu-ppc] [RFC 03/17] pseries: Always use core objects for CPU cons
From: |
Alexey Kardashevskiy |
Subject: |
Re: [Qemu-ppc] [RFC 03/17] pseries: Always use core objects for CPU construction |
Date: |
Thu, 3 Nov 2016 19:11:48 +1100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
On 30/10/16 22:11, David Gibson wrote:
> Currently the pseries machine has two paths for constructing CPUs. On
> newer machine type versions, which support cpu hotplug, it constructs
> cpu core objects, which in turn construct CPU threads. For older machine
> versions it individually constructs the CPU threads.
>
> This division is going to make some future changes to the cpu construction
> harder, so this patch unifies them. Now cpu core objects are always
> created. This requires some updates to allow core objects to be created
> without a full complement of threads (since older versions allowed a
> number of cpus not a multiple of the threads-per-core). Likewise it needs
> some changes to the cpu core hot/cold plug path so as not to choke on the
> old machine types without hotplug support.
>
> For good measure, we move the cpu construction to its own subfunction,
> spapr_init_cpus().
>
> Signed-off-by: David Gibson <address@hidden>
> ---
> hw/ppc/spapr.c | 125
> +++++++++++++++++++++++++++---------------------
> hw/ppc/spapr_cpu_core.c | 30 +++++++-----
> include/hw/ppc/spapr.h | 1 -
> 3 files changed, 89 insertions(+), 67 deletions(-)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index c8e2921..ad68a9d 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1688,11 +1688,80 @@ static void spapr_validate_node_memory(MachineState
> *machine, Error **errp)
> }
> }
>
> +static void spapr_init_cpus(sPAPRMachineState *spapr)
> +{
> + MachineState *machine = MACHINE(spapr);
> + MachineClass *mc = MACHINE_GET_CLASS(machine);
> + char *type = spapr_get_cpu_core_type(machine->cpu_model);
> + int smt = kvmppc_smt_threads();
> + int spapr_max_cores, spapr_cores;
> + int i;
> +
> + if (!type) {
> + error_report("Unable to find sPAPR CPU Core definition");
> + exit(1);
> + }
> +
> + if (mc->query_hotpluggable_cpus) {
> + 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);
> + }
> +
> + spapr_max_cores = max_cpus / smp_threads;
> + spapr_cores = smp_cpus / smp_threads;
> + } else {
> + if (max_cpus != smp_cpus) {
> + error_report("This machine version does not support CPU
> hotplug");
> + exit(1);
> + }
> +
> + spapr_max_cores = QEMU_ALIGN_UP(smp_cpus, smp_threads) / smp_threads;
> + spapr_cores = spapr_max_cores;
> + }
> +
> + spapr->cores = g_new0(Object *, spapr_max_cores);
> + for (i = 0; i < spapr_max_cores; i++) {
> + int core_id = i * smp_threads;
> +
> + if (mc->query_hotpluggable_cpus) {
> + sPAPRDRConnector *drc =
> + spapr_dr_connector_new(OBJECT(spapr),
> + SPAPR_DR_CONNECTOR_TYPE_CPU,
> + (core_id / smp_threads) * smt);
> +
> + qemu_register_reset(spapr_drc_reset, drc);
> + }
> +
> + if (i < spapr_cores) {
> + Object *core = object_new(type);
> + int nr_threads = smp_threads;
> +
> + /* Handle the partially filled core for older machine types */
> + if ((i + 1) * smp_threads >= smp_cpus) {
> + nr_threads = smp_cpus - i * smp_threads;
> + }
What is this exactly for? Older machines report "qemu-system-ppc64: threads
must be 8" when I do "-smp 12,threads=8 -machine pseries-2.2".
> +
> + object_property_set_int(core, nr_threads, "nr-threads",
> + &error_fatal);
> + object_property_set_int(core, core_id, CPU_CORE_PROP_CORE_ID,
> + &error_fatal);
> + object_property_set_bool(core, true, "realized", &error_fatal);
> + }
> + }
> + g_free(type);
> +}
> +
> /* pSeries LPAR / sPAPR hardware init */
> static void ppc_spapr_init(MachineState *machine)
> {
> sPAPRMachineState *spapr = SPAPR_MACHINE(machine);
> - MachineClass *mc = MACHINE_GET_CLASS(machine);
> sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(machine);
> const char *kernel_filename = machine->kernel_filename;
> const char *initrd_filename = machine->initrd_filename;
> @@ -1707,21 +1776,6 @@ static void ppc_spapr_init(MachineState *machine)
> long load_limit, fw_size;
> char *filename;
> int smt = kvmppc_smt_threads();
> - int spapr_cores = smp_cpus / smp_threads;
> - int spapr_max_cores = max_cpus / smp_threads;
> -
> - if (mc->query_hotpluggable_cpus) {
> - 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;
>
> @@ -1801,44 +1855,7 @@ static void ppc_spapr_init(MachineState *machine)
>
> ppc_cpu_parse_features(machine->cpu_model);
>
> - if (mc->query_hotpluggable_cpus) {
> - char *type = spapr_get_cpu_core_type(machine->cpu_model);
> -
> - if (type == NULL) {
> - error_report("Unable to find sPAPR CPU Core definition");
> - exit(1);
> - }
> -
> - spapr->cores = g_new0(Object *, spapr_max_cores);
> - for (i = 0; i < spapr_max_cores; i++) {
> - int core_id = i * smp_threads;
> - sPAPRDRConnector *drc =
> - spapr_dr_connector_new(OBJECT(spapr),
> - SPAPR_DR_CONNECTOR_TYPE_CPU,
> - (core_id / smp_threads) * smt);
> -
> - qemu_register_reset(spapr_drc_reset, drc);
> -
> - if (i < spapr_cores) {
> - Object *core = object_new(type);
> - object_property_set_int(core, smp_threads, "nr-threads",
> - &error_fatal);
> - object_property_set_int(core, core_id, CPU_CORE_PROP_CORE_ID,
> - &error_fatal);
> - object_property_set_bool(core, true, "realized",
> &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);
> - }
> - }
> + spapr_init_cpus(spapr);
>
> if (kvm_enabled()) {
> /* Enable H_LOGICAL_CI_* so SLOF can talk to in-kernel devices */
> diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
> index e0c14f6..1357293 100644
> --- a/hw/ppc/spapr_cpu_core.c
> +++ b/hw/ppc/spapr_cpu_core.c
> @@ -46,7 +46,8 @@ static void spapr_cpu_destroy(PowerPCCPU *cpu)
> qemu_unregister_reset(spapr_cpu_reset, cpu);
> }
>
> -void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu, Error **errp)
> +static void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu,
> + Error **errp)
> {
> CPUPPCState *env = &cpu->env;
> CPUState *cs = CPU(cpu);
> @@ -166,6 +167,7 @@ void spapr_core_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev,
> Error **errp)
> {
> sPAPRMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev));
> + MachineClass *mc = MACHINE_GET_CLASS(spapr);
> sPAPRCPUCore *core = SPAPR_CPU_CORE(OBJECT(dev));
> CPUCore *cc = CPU_CORE(dev);
> CPUState *cs = CPU(core->threads);
> @@ -180,7 +182,7 @@ void spapr_core_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev,
> drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, index * smt);
> spapr->cores[index] = OBJECT(dev);
>
> - g_assert(drc);
> + g_assert(drc || !mc->query_hotpluggable_cpus);
>
> /*
> * Setup CPU DT entries only for hotplugged CPUs. For boot time or
> @@ -190,13 +192,15 @@ void spapr_core_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev,
> fdt = spapr_populate_hotplug_cpu_dt(cs, &fdt_offset, spapr);
> }
>
> - 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 (drc) {
> + 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) {
> @@ -209,8 +213,10 @@ void spapr_core_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev,
> /*
> * 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);
> + if (drc) {
> + drck->set_allocation_state(drc,
> SPAPR_DR_ALLOCATION_STATE_USABLE);
> + drck->set_isolation_state(drc,
> SPAPR_DR_ISOLATION_STATE_UNISOLATED);
> + }
> }
> }
>
> @@ -227,7 +233,7 @@ void spapr_core_pre_plug(HotplugHandler *hotplug_dev,
> DeviceState *dev,
> char *base_core_type = spapr_get_cpu_core_type(machine->cpu_model);
> const char *type = object_get_typename(OBJECT(dev));
>
> - if (!mc->query_hotpluggable_cpus) {
> + if (dev->hotplugged && !mc->query_hotpluggable_cpus) {
> error_setg(&local_err, "CPU hotplug not supported for this machine");
> goto out;
> }
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index bd5bcf7..f8d444d 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -614,7 +614,6 @@ void
> spapr_hotplug_req_add_by_count_indexed(sPAPRDRConnectorType drc_type,
> uint32_t count, uint32_t index);
> void spapr_hotplug_req_remove_by_count_indexed(sPAPRDRConnectorType drc_type,
> uint32_t count, uint32_t
> index);
> -void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu, Error **errp);
> void *spapr_populate_hotplug_cpu_dt(CPUState *cs, int *fdt_offset,
> sPAPRMachineState *spapr);
>
>
--
Alexey
- Re: [Qemu-ppc] [RFC 03/17] pseries: Always use core objects for CPU construction,
Alexey Kardashevskiy <=