On Wed, Nov 21, 2018 at 09:47:48AM -0800, Tim Chen wrote: > On 11/21/2018 05:56 AM, Greg Kroah-Hartman wrote: > > On Wed, Nov 21, 2018 at 02:21:15PM +0100, Jiri Kosina wrote: > >> On Sun, 11 Nov 2018, Greg Kroah-Hartman wrote: > >> > >>> 4.19-stable review patch. If anyone has any objections, please let me know. > >> > >> Greg, please drop this patch from all -stable for now. Version that > >> wouldn't have such performance impact is being worked on. > > > > Is it reverted in Linus's tree? If not, then anything that comes "later > > on" will not apply here, right? > > > > I see the thread asking about this, but I got really conflicting > > messages here, and now it's in all of the latest releases, and no > > testing seems to have uncovered issues. Is it just a "slow down" > > problem? > > Greg, > > It could be a big slow down in excess of 20% for some applications. > And cross sibling Spectre v2 attack is quite hard to pull off. > > So till we have the accompanying patchset that only apply STIBP on processes > that really need it instead of universally, it should be withheld from > stable. Ok, now reverted, thanks. greg k-h
