On Thu, Jan 10, 2019 at 12:32:43PM -0500, Steven Rostedt wrote: > On Thu, 10 Jan 2019 11:20:04 -0600 > Josh Poimboeuf <jpoim...@redhat.com> wrote: > > > > > While I can't find a reason for hypervisors to emulate this instruction, > > > smarter people might find ways to turn it into a security exploit. > > > > Interesting point... but I wonder if it's a realistic concern. BTW, > > text_poke_bp() also relies on undocumented behavior. > > But we did get an official OK from Intel that it will work. Took a bit > of arm twisting to get them to do so, but they did. And it really is > pretty robust.
Did we (they?) list any caveats for this behavior? E.g. I'm fairly certain atomicity guarantees go out the window if WC memtype is used.
