On Mon, Mar 07, 2016 at 02:49:06PM +1100, David Gibson wrote:
> 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.
It appears that this would be needed by other archs also to set the
NUMA node for the hot-plugged CPU. How about make an API out of this
and use this something like below ? Igor ?
-------------------------------------------------------------------
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 0aeefd2..8347234 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1112,6 +1112,7 @@ void pc_hot_add_cpu(const int64_t id, Error **errp)
error_propagate(errp, local_err);
return;
}
+ numa_set_cpu(CPU(cpu));
object_unref(OBJECT(cpu));
}
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index a42f8c0..f2b3b67 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1645,7 +1645,6 @@ 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);
@@ -1671,12 +1670,7 @@ 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;
- }
- }
+ numa_set_cpu(cs);
xics_cpu_setup(spapr->icp, cpu);
qemu_register_reset(spapr_cpu_reset, cpu);
diff --git a/include/sysemu/numa.h b/include/sysemu/numa.h
index bb184c9..648d68b 100644
--- a/include/sysemu/numa.h
+++ b/include/sysemu/numa.h
@@ -31,5 +31,6 @@ extern QemuOptsList qemu_numa_opts;
void numa_set_mem_node_id(ram_addr_t addr, uint64_t size, uint32_t node);
void numa_unset_mem_node_id(ram_addr_t addr, uint64_t size, uint32_t node);
uint32_t numa_get_node(ram_addr_t addr, Error **errp);
+void numa_set_cpu(CPUState *cpu);
#endif
diff --git a/numa.c b/numa.c
index 4c4f7f5..1b47c15 100644
--- a/numa.c
+++ b/numa.c
@@ -396,20 +396,32 @@ void parse_numa_opts(MachineClass *mc)
}
}
+static void numa_set_cpu_numa_node(CPUState *cpu)
+{
+ int i;
+
+ for (i = 0; i < nb_numa_nodes; i++) {
+ if (test_bit(cpu->cpu_index, numa_info[i].node_cpu)) {
+ cpu->numa_node = i;
+ break;
+ }
+ }
+}
+
void numa_post_machine_init(void)
{
CPUState *cpu;
- int i;
CPU_FOREACH(cpu) {
- for (i = 0; i < nb_numa_nodes; i++) {
- if (test_bit(cpu->cpu_index, numa_info[i].node_cpu)) {
- cpu->numa_node = i;
- }
- }
+ numa_set_cpu_numa_node(cpu);
}
}
+void numa_set_cpu(CPUState *cpu)
+{
+ numa_set_cpu_numa_node(cpu);
+}
+
static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
const char *name,
uint64_t ram_size)
-------------------------------------------------------------------
>
> > 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?
Seems possible, will change.
>
> > /* 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.
You mean a separate patch for this or push this around to an existing
patch of the series ?
Regards,
Bharata.
