On Sun, Jan 14, 2018 at 01:54:44PM +0100, Ingo Molnar wrote: > > * Greg KH <[email protected]> wrote: > > > On Sun, Jan 14, 2018 at 11:27:13AM +0100, Peter Zijlstra wrote: > > > > > > The intel_bts driver does not use the 'normal' BTS buffer we allocated > > > space for in the cpu_entry_area but instead uses the memory allocated > > > for the perf AUX buffer. > > > > > > This obviously comes apart when using PTI because then the kernel > > > mapping; which includes that AUX buffer memory; disappears. > > > > > > For now disable this driver when PTI is enabled, we'll try and sort > > > something out later. > > > > > > Cc: Alexander Shishkin <[email protected]> > > > Reported-by: Vince Weaver <[email protected]> > > > Reported-by: Robert Święcki <[email protected]> > > > Signed-off-by: Peter Zijlstra (Intel) <[email protected]> > > > > Can you add a: > > Cc: stable <[email protected]> > > please? > > Note that these fixes are all going into tip:x86/pti, which is still a > backporting > friendly linear set of commits that should all be backported. > > So once 99a9dc98ba52 goes upstream, all of v4.14..99a9dc98ba52 the remaining > bits > can go to -stable as well. > > Will keep you updated about the latest status periodically, right now the > latest > that is already upstream is: > > de791821c295: x86/pti: Rename BUG_CPU_INSECURE to BUG_CPU_MELTDOWN > > i.e. all 194 commits in the v4.14..de791821c295 range should be queued up for > -stable. (And most of them already are.)
I hope I got all of those in that branch already, as I've been watching it :) > There are 28 new commits in tip:x86/pti that will (hopefully) go upstream > later > today. Great, again, thanks for doing it this way, it has made it much easier for me. greg k-h
