mirror of https://gitee.com/openkylin/linux.git
KVM: PPC: Book3S HV: kvmppc_host_rm_ops - handle offlining CPUs
The kvmppc_host_rm_ops structure keeps track of which cores are are in the host by maintaining a bitmask of active/runnable online CPUs that have not entered the guest. This patch adds support to manage the bitmask when a CPU is offlined or onlined in the host. Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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@ -3053,6 +3053,36 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
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}
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#ifdef CONFIG_KVM_XICS
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static int kvmppc_cpu_notify(struct notifier_block *self, unsigned long action,
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void *hcpu)
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{
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unsigned long cpu = (long)hcpu;
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switch (action) {
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE_FROZEN:
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kvmppc_set_host_core(cpu);
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break;
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#ifdef CONFIG_HOTPLUG_CPU
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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case CPU_UP_CANCELED:
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case CPU_UP_CANCELED_FROZEN:
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kvmppc_clear_host_core(cpu);
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break;
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#endif
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default:
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block kvmppc_cpu_notifier = {
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.notifier_call = kvmppc_cpu_notify,
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};
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/*
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* Allocate a per-core structure for managing state about which cores are
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* running in the host versus the guest and for exchanging data between
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@ -3086,6 +3116,8 @@ void kvmppc_alloc_host_rm_ops(void)
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return;
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}
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get_online_cpus();
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for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
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if (!cpu_online(cpu))
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continue;
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@ -3104,14 +3136,21 @@ void kvmppc_alloc_host_rm_ops(void)
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l_ops = (unsigned long) ops;
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if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
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put_online_cpus();
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kfree(ops->rm_core);
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kfree(ops);
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return;
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}
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register_cpu_notifier(&kvmppc_cpu_notifier);
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put_online_cpus();
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}
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void kvmppc_free_host_rm_ops(void)
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{
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if (kvmppc_host_rm_ops_hv) {
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unregister_cpu_notifier(&kvmppc_cpu_notifier);
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kfree(kvmppc_host_rm_ops_hv->rm_core);
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kfree(kvmppc_host_rm_ops_hv);
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kvmppc_host_rm_ops_hv = NULL;
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