static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle) { int rc; common_cpu_up(cpu, idle); xen_setup_runstate_info(cpu); /* * PV VCPUs are always successfully taken down (see 'while' loop * in xen_cpu_die()), so -EBUSY is an error. */ rc = cpu_check_up_prepare(cpu); if (rc) return rc; /* make sure interrupts start blocked */ per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1; rc = cpu_initialize_context(cpu, idle); if (rc) return rc; xen_pmu_init(cpu); rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL); BUG_ON(rc); while (cpu_report_state(cpu) != CPU_ONLINE) HYPERVISOR_sched_op(SCHEDOP_yield, NULL); return 0; }
static int xen_cpu_up_prepare_hvm(unsigned int cpu) { int rc; /* * This can happen if CPU was offlined earlier and * offlining timed out in common_cpu_die(). */ if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) { xen_smp_intr_free(cpu); xen_uninit_lock_cpu(cpu); } if (cpu_acpi_id(cpu) != U32_MAX) per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu); else per_cpu(xen_vcpu_id, cpu) = cpu; xen_vcpu_setup(cpu); if (xen_have_vector_callback && xen_feature(XENFEAT_hvm_safe_pvclock)) xen_setup_timer(cpu); rc = xen_smp_intr_init(cpu); if (rc) { WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n", cpu, rc); return rc; } return 0; }