address_space_access_valid: address_space_to_flatview needs RCU lock
address_space_access_valid is calling address_space_to_flatview but it can be called outside the RCU lock. To fix it, push the rcu_read_lock/unlock pair up from flatview_access_valid to address_space_access_valid. Reviewed-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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