On 01/07/2010 02:33 PM, Anthony Liguori wrote:

There's another option.

Make cpuid information part of live migration protocol, and then support something like -cpu Xeon-3550. We would remember the exact cpuid mask we present to the guest and then we could validate that we can obtain the same mask on the destination.

Currently, our policy is to only migrate dynamic (from the guest's point of view) state, and specify static state on the command line [1].

I think your suggestion makes a lot of sense, but I'd like to expand it to move all guest state, whether dynamic or static. So '-m 1G' would be migrated as well (but not -mem-path). Similarly, in -drive file=...,if=ide,index=1, everything but file=... would be migrated.

This has an advantage wrt hotplug: since qemu is responsible for migrating all guest visible information, the migrator is no longer responsible for replaying hotplug events in the exact sequence they happened.

In short, I think we should apply your suggestion as broadly as possible.

[1] cpuid state is actually dynamic; repeated cpuid instruction execution with the same operands can return different results. kvm supports querying and setting this state.

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error compiling committee.c: too many arguments to function



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