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The lock to `vm_config` is held for accessing `cpus.kvm_hyperv` passing
as a reference to `arch::generate_common_cpuid()`, so acquiring the same
lock again while calling to the same function is a deadlock.
Fixes: 3793ffe888
Reported-by: Yi Wang <foxywang@tencent.com>
Signed-off-by: Bo Chen <chen.bo@intel.com>