On Tue, 26 Jun 2018 11:05:21 +0200 Peter Zijlstra <pet...@infradead.org> wrote:
> On Fri, Jun 22, 2018 at 04:11:07PM +0100, Alan Cox wrote: > > On Thu, 2018-06-21 at 21:58 +0200, Peter Zijlstra wrote: > > > On Sun, May 27, 2018 at 08:45:55AM -0700, Fenghua Yu wrote: > > > > Firmware may contain split locked instructions. > > > > > > I think that's the wrong attitude. You should mandate in your BIOS > > > development guide that Firmware _MUST_NOT_ contain unaligned LOCK > > > prefixed instructions. > > > > > > > In the longer term I would agree entirely with that sentiment. > > But then how do we deal with SMIs ? On a system doing that level of real time you don't do SMIs. I think Thomas comment that this shouldn't be in a production kernel because the firmware people need to have their house in order before that is a fair one. (and I've already been poking people to make sure this is documented properly as a requirement) Alan
