Re: [Xen-devel] [PATCHv1 2/2] passthrough: improve locking when iterating over interrupts bound to VMs

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.10.15 at 13:05, <david.vrabel@xxxxxxxxxx> wrote:
> radix_tree_gang_lookup() only requires a RCU read lock, not the
> per-domain event_lock.

... when not caring about a consistent snapshot.

> @@ -678,9 +684,7 @@ void hvm_dpci_msi_eoi(struct domain *d, int vector)
>      if ( !iommu_enabled || !d->arch.hvm_domain.irq.dpci )
>         return;
>  
> -    spin_lock(&d->event_lock);
>      pt_pirq_iterate(d, _hvm_dpci_msi_eoi, (void *)(long)vector);
> -    spin_unlock(&d->event_lock);
>  }

How about other callers of pt_pirq_iterate()?

Jan


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