Re: [KVM PATCH v2 2/2] kvm: add support for irqfd via eventfd-notification interface

Gregory Haskins
2009-04-28T11:05:05Z

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Avi Kivity wrote:
> Gregory Haskins wrote:
>
>
>
>>> But eventfd_signal basically marries us to eventfd.
>>>
>>
>> Well, only if we expect the fd to have eventfd semantics. There are
>> advantages to doing so, as we have discussed, because things like AIO
>> can polymorhpically signal an interrupt without even knowing whats
>> behind the eventfd. But this isn't a strict requirement to support
>> AIO. Really all we need is a way for both kernel and userspace to
>> signal. Perhaps I should export an "irqfd_signal()" function from kvm,
>> which today will map to eventfd_signal(), and tomorrow to ??. I don't
>> think using f_ops->write() is an option for in-kernel signaling, so we
>> need some kind of interface here.
>>
>> Does that sound reasonable?
>>
>
> irqfd_signal() ties the user of irqfd to kvm. I want this user to be
> independent of kvm; it should work with eventfd, kvm's eventfd
> lookalike (if we move away from eventfd) or pipes.

So what is your proposal for such interface?

-Greg

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