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KVM: Move irq routing data structure to rcu locking

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Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2009-08-24 11:54:22 +03:00 committed by Avi Kivity
parent 3e71f88bc9
commit e42bba90bf
1 changed files with 11 additions and 5 deletions
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16
virt/kvm/irq_comm.c
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@ -159,7 +159,8 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
* IOAPIC. So set the bit in both. The guest will ignore
* writes to the unused one.
*/
irq_rt = kvm->irq_routing;
rcu_read_lock();
irq_rt = rcu_dereference(kvm->irq_routing);
if (irq < irq_rt->nr_rt_entries)
hlist_for_each_entry(e, n, &irq_rt->map[irq], link) {
int r = e->set(e, kvm, irq_source_id, level);
@ -168,6 +169,7 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
ret = r + ((ret < 0) ? 0 : ret);
}
rcu_read_unlock();
return ret;
}
@ -179,7 +181,10 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
trace_kvm_ack_irq(irqchip, pin);
gsi = kvm->irq_routing->chip[irqchip][pin];
rcu_read_lock();
gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
rcu_read_unlock();
if (gsi != -1)
hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list,
link)
@ -279,9 +284,9 @@ void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
void kvm_free_irq_routing(struct kvm *kvm)
{
mutex_lock(&kvm->irq_lock);
/* Called only during vm destruction. Nobody can use the pointer
at this stage */
kfree(kvm->irq_routing);
mutex_unlock(&kvm->irq_lock);
}
static int setup_routing_entry(struct kvm_irq_routing_table *rt,
@ -387,8 +392,9 @@ int kvm_set_irq_routing(struct kvm *kvm,
mutex_lock(&kvm->irq_lock);
old = kvm->irq_routing;
kvm->irq_routing = new;
rcu_assign_pointer(kvm->irq_routing, new);
mutex_unlock(&kvm->irq_lock);
synchronize_rcu();
new = old;
r = 0;