[Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?

[Peter Maydell]

Hi; I'm currently writing '-cpu max' support for ARM. For that I'd
like to be able to do the "probe host kernel for its supported feature
set" in the CPU object's instance-init function, but I'd like to do
it just once and cache the answer. Can I rely on something or other
having the BQL or otherwise ensuring that two threads don't run
the instance_init method in parallel (eg in a hotplug situation),
or do I need to create and use my own mutex to protect the cached
answer data?

thanks
-- PMM