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
