On Wed, Jan 10, 2018 at 01:20:45PM +0100, Andrea Arcangeli wrote: > On Wed, Jan 10, 2018 at 12:12:53PM +0000, David Woodhouse wrote: > > IBRS is like a barrier. You must write it between the 'problematic' > > loading of the branch targets, and the kernel code which might be > > affected. > > > > You cannot, on current hardware, merely set it once and forget about > > it. That is not sufficient. > > I think you've got it all wrong...
On a side note, I hope once you get it right, the debugfs tunable will suddenly look less horrid.
