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Re: [Xen-devel] Proposal for init/kexec/hotplug format for Xen

Keir Fraser wrote:

The IDC primitives are likely to be *so* low level that this will be a non-issue. Anything that can needs to be fault-tolerance aware in any way I think will be in higher layers.

Really the libidc is almost a no-op -- we have shared memory and notifications -- semaphores and message queues on top of that is very little code.

I agree.

You sound like you are more worried about the device-channel setup/teardown/probe/recovery code. That would be above libidc, if we use libidc at all.

I'm currently prototyping a semaphore mechanism. One of the nice things I realized is that if a message queue uses semaphores, then something like xcs is unnecessary.

What I'm thinking about right now is how to assign out ports for notification. It's somewhat non-trivial to figure out the best way to manage that. Any thoughts?

Anthony Liguori

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