On Mon, 2017-11-13 at 10:26 +1100, Benjamin Herrenschmidt wrote: > On Sat, 2017-11-11 at 10:03 -0500, Mathieu Desnoyers wrote: > > x86 has a missing core serializing instruction in migration scenarios. > > > > Given that x86-32 can return to user-space with sysexit, and x86-64 > > through sysretq and sysretl, which are not core serializing, the > > following user-space self-modifiying code (JIT) scenario can occur: > > Is this about load/store consistency ? In this case, don't you also > have problems with get/put_user and not just going to userspace ? Ah forget it, I saw Linus earlier messages. Cheers, Ben.
