spapr_possible_cpu_arch_ids() counts only cores, and so the number of available CPUs is the number of vCPU divided by smp_threads.
... -smp 4,maxcpus=8,cores=2,threads=2,sockets=2 -numa node,cpus=0,cpus=1 \ -numa node,cpus=3,cpus=4 \ -numa node -numa node This generates (info hotpluggable-cpus) node-id: 0 core-id: 0 thread-id: 0 [thread-id: 1] node-id: 0 core-id: 6 thread-id: 0 [thread-id: 1] node-id: 1 core-id: 2 thread-id: 0 [thread-id: 1] node-id: 1 core-id: 4 thread-id: 0 [thread-id: 1] And this command line generates the following error: CPU(s) not present in any NUMA nodes: CPU 3 [core-id: 6] That is wrong because CPU 3 [core-id: 6] is assigned to node-id 0 Moreover "cpus=4" is not valid, because it means core-id 8 but maxcpus is 8. With this patch we have now: node-id: 0 core-id: 0 thread-id: 0 node-id: 0 core-id: 0 thread-id: 1 node-id: 0 core-id: 1 thread-id: 0 node-id: 1 core-id: 1 thread-id: 1 node-id: 0 core-id: 2 thread-id: 1 node-id: 1 core-id: 2 thread-id: 0 node-id: 0 core-id: 3 thread-id: 1 node-id: 0 core-id: 3 thread-id: 0 CPUs 0 (core-id: 0 thread-id: 0) and 1 (core-id: 0 thread-id: 1) are correctly assigned to node-id 0, CPUs 3 (core-id: 1 thread-id: 1) and 4 (core-id: 2 thread-id: 0) are correctly assigned to node-id 1. All other CPUs are assigned to node-id 0 by default. And the error message is also correct: CPU(s) not present in any NUMA nodes: CPU 2 [core-id: 1, thread-id: 0], \ CPU 5 [core-id: 2, thread-id: 1], \ CPU 6 [core-id: 3, thread-id: 0], \ CPU 7 [core-id: 3, thread-id: 1] Fixes: ec78f8114bc4 ("numa: use possible_cpus for not mapped CPUs check") Cc: imamm...@redhat.com Before commit ec78f8114bc4, output was correct: CPU(s) not present in any NUMA nodes: 2 5 6 7 Signed-off-by: Laurent Vivier <lviv...@redhat.com> --- hw/ppc/spapr.c | 33 +++++++++++++-------------------- 1 file changed, 13 insertions(+), 20 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 332cba89d425..7196ba09da34 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -2404,15 +2404,13 @@ static void spapr_validate_node_memory(MachineState *machine, Error **errp) /* find cpu slot in machine->possible_cpus by core_id */ static CPUArchId *spapr_find_cpu_slot(MachineState *ms, uint32_t id, int *idx) { - int index = id / smp_threads; - - if (index >= ms->possible_cpus->len) { + if (id >= ms->possible_cpus->len) { return NULL; } if (idx) { - *idx = index; + *idx = id; } - return &ms->possible_cpus->cpus[index]; + return &ms->possible_cpus->cpus[id]; } static void spapr_set_vsmt_mode(sPAPRMachineState *spapr, Error **errp) @@ -2514,7 +2512,7 @@ static void spapr_init_cpus(sPAPRMachineState *spapr) error_report("This machine version does not support CPU hotplug"); exit(1); } - boot_cores_nr = possible_cpus->len; + boot_cores_nr = possible_cpus->len / smp_threads; } if (smc->pre_2_10_has_unused_icps) { @@ -2528,7 +2526,7 @@ static void spapr_init_cpus(sPAPRMachineState *spapr) } } - for (i = 0; i < possible_cpus->len; i++) { + for (i = 0; i < possible_cpus->len / smp_threads; i++) { int core_id = i * smp_threads; if (mc->has_hotpluggable_cpus) { @@ -3795,21 +3793,16 @@ spapr_cpu_index_to_props(MachineState *machine, unsigned cpu_index) static int64_t spapr_get_default_cpu_node_id(const MachineState *ms, int idx) { - return idx / smp_cores % nb_numa_nodes; + return idx / (smp_cores * smp_threads) % nb_numa_nodes; } static const CPUArchIdList *spapr_possible_cpu_arch_ids(MachineState *machine) { int i; const char *core_type; - int spapr_max_cores = max_cpus / smp_threads; - MachineClass *mc = MACHINE_GET_CLASS(machine); - if (!mc->has_hotpluggable_cpus) { - spapr_max_cores = QEMU_ALIGN_UP(smp_cpus, smp_threads) / smp_threads; - } if (machine->possible_cpus) { - assert(machine->possible_cpus->len == spapr_max_cores); + assert(machine->possible_cpus->len == max_cpus); return machine->possible_cpus; } @@ -3820,16 +3813,16 @@ static const CPUArchIdList *spapr_possible_cpu_arch_ids(MachineState *machine) } machine->possible_cpus = g_malloc0(sizeof(CPUArchIdList) + - sizeof(CPUArchId) * spapr_max_cores); - machine->possible_cpus->len = spapr_max_cores; + sizeof(CPUArchId) * max_cpus); + machine->possible_cpus->len = max_cpus; for (i = 0; i < machine->possible_cpus->len; i++) { - int core_id = i * smp_threads; - machine->possible_cpus->cpus[i].type = core_type; machine->possible_cpus->cpus[i].vcpus_count = smp_threads; - machine->possible_cpus->cpus[i].arch_id = core_id; + machine->possible_cpus->cpus[i].arch_id = i; machine->possible_cpus->cpus[i].props.has_core_id = true; - machine->possible_cpus->cpus[i].props.core_id = core_id; + machine->possible_cpus->cpus[i].props.core_id = i / smp_threads; + machine->possible_cpus->cpus[i].props.has_thread_id = true; + machine->possible_cpus->cpus[i].props.thread_id = i % smp_threads; } return machine->possible_cpus; } -- 2.20.1