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xen-devel
RE: [Xen-devel] Fast inter-VM signaling using monitor/mwait
> The mwait instruction is privileged. So I added a new hypercall that
> wraps access to the mwait instruction. Thus, my code has a Xen
> component (the new hypercall) and a guest kernel component (code for
> executing the hypercall and for turning off/on the timer interrupts
> around the hypercall). For this code to be merged into Xen, it would
> need to add security checks and check whether the processor supports
> such a feature.
I seem to recall that some newer CPUs have an mwait instruction accessible from
ring3, using a different opcode -- you might want to check this out.
How do you deal with atomicity of the monitor and mwait? i.e. how do you stop
the hypervisor pre-empting the VM and using monitor for its own purposes or
letting another guest use it?
Have you thought about HVM guests as well as PV?
Best,
Ian
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