Li, Shaohua wrote:
> How about take cpu hotplug lock for kvm_vm_ioctl and kvm_vcpu_ioctl?
>
>
That will serialize calls to these functions, and we want parallel
execution of kvm_vcpu_ioctl(). We could make it a reader-writer lock,
but...
I think that adding a
raw_notifier_call_chain(&cpu_chain, CPU_DYING, NULL);
in take_cpu_down() solve the problem. The semantics of that would be
that the chain is executed on the dying cpu, without being allowed to
fail, and requiring atomic execution. I don't know whether that would
acceptable to the cpu hotplug maintainers.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
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