direct IO access?

Hi, I've been having some discussions about embedded hypervisors, and one of the issues that has come up is latency for device access. This is particularly a problem for real-time applications...

I've collected some thoughts at http://kvm.qumranet.com/kvmwiki/DirectIo
(please correct it if I've misstated anything). I think we should flesh out some of the pros/cons of the possible solutions at the bottom. For starters, have the virtual IO ideas proposed so far considered applications that are about control, not data? For example, I'm thinking about control of a giant laser: is that block, or net? :)

Hollis Blanchard
IBM Linux Technology Center


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