Re: [PATCH RFC] kvm: fast-path msi injection with irqfd

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On 11/18/2010 03:14 PM, Gleb Natapov wrote:
On Thu, Nov 18, 2010 at 03:03:37PM +0200, Michael S. Tsirkin wrote:
>  >  >+static inline void kvm_irq_routing_update(struct kvm *kvm,
>  >  >+					  struct kvm_irq_routing_table *irq_rt)
>  >  >+{
>  >  >+	rcu_assign_pointer(kvm->irq_routing, irq_rt);
>  >  >+}
>  >  >+
>  >  >   static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
>  >  >   {
>  >  >   	return -ENOSYS;
>  >
>  >  Apart from these minor issues, looks good.
>
>
>  Something we should consider improving is the loop over all VCPUs that
>  kvm_irq_delivery_to_apic invokes.  I think that (for non-broadcast
>  interrupts) it should be possible to precompute an store the CPU
>  in question as part of the routing entry.
>
>  Something for a separate patch ... comments?
>
I do not think this info should be part of routing entry. Routing entry
is more about describing wires on the board. Other then that
this is a good idea that, IIRC, we already discussed once.


Not as part of the routing entry exposed to userspace. But as a private kernel field, why not?

--
error compiling committee.c: too many arguments to function

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