Re: [KVM PATCH v10] kvm: add support for irqfd

Michael S. Tsirkin
2009-06-14T13:30:46Z

On Sun, Jun 14, 2009 at 04:23:36PM +0300, Avi Kivity wrote:
> Michael S. Tsirkin wrote:
>
>
>
>>> I think Avi asked for this specific feature during review which is the
>>> reason why its there today. However, I agree that it would probably be
>>> a good idea to put an upper limit on the number of supported aliases
>>> that can be registered. Will fix.
>>>
>>> Thanks Michael,
>>>
>>> -Greg
>>>
>>>
>>>
>>
>>
>> Avi, can you elaborate on why do we want to map multiple fds
>> to the same gsi? I think it's better to allow a 1:1 mapping
>> only: if many processes want to trigger interrupts they can
>> all write to the same fd.
>>
>
> I don't want to assume that the eventfds all come from the same source.
>
> That said, we have a workaround, allocate a new gsi with the same routes
> and attach the excess eventfds there.

Right. So you are ok with 1:1 irqfd:gsi requirement for now?
This seems nicer than N:1 with an arbitrary N.

--
MST