[openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation

[Roland Dreier]

    Troy> Is there a check in the kernel that the memory is actually
    Troy> mlock()ed?

No.

    Troy> What if a malicious (or broken) application does
    Troy> ibv_reg_mr() but doesn't lock the memory? Does the IB card
    Troy> get a physical address for a page that might get swapped
    Troy> out?

No, the kernel does get_user_pages().  So the pages that the HCA gets
will not be swapped or used for anything else.  The only thing a
malicious userspace app can do is screw itself up.

 - R.