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KVM: PPC: Book3S HV: kvmppc_host_rm_ops - handle offlining CPUs

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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>
This commit is contained in:
Suresh Warrier 2015-12-17 14:59:08 -06:00 committed by Paul Mackerras
parent b8e6a87c82
commit 6f3bb80944
1 changed files with 39 additions and 0 deletions
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39
arch/powerpc/kvm/book3s_hv.c
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@ -3053,6 +3053,36 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
}
#ifdef CONFIG_KVM_XICS
static int kvmppc_cpu_notify(struct notifier_block *self, unsigned long action,
void *hcpu)
{
unsigned long cpu = (long)hcpu;
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
kvmppc_set_host_core(cpu);
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_DEAD:
case CPU_DEAD_FROZEN:
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
kvmppc_clear_host_core(cpu);
break;
#endif
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block kvmppc_cpu_notifier = {
.notifier_call = kvmppc_cpu_notify,
};
/*
* Allocate a per-core structure for managing state about which cores are
* running in the host versus the guest and for exchanging data between
@ -3086,6 +3116,8 @@ void kvmppc_alloc_host_rm_ops(void)
return;
}
get_online_cpus();
for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
if (!cpu_online(cpu))
continue;
@ -3104,14 +3136,21 @@ void kvmppc_alloc_host_rm_ops(void)
l_ops = (unsigned long) ops;
if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
put_online_cpus();
kfree(ops->rm_core);
kfree(ops);
return;
}
register_cpu_notifier(&kvmppc_cpu_notifier);
put_online_cpus();
}
void kvmppc_free_host_rm_ops(void)
{
if (kvmppc_host_rm_ops_hv) {
unregister_cpu_notifier(&kvmppc_cpu_notifier);
kfree(kvmppc_host_rm_ops_hv->rm_core);
kfree(kvmppc_host_rm_ops_hv);
kvmppc_host_rm_ops_hv = NULL;