Messages in this thread | | | Date | Sun, 14 Jan 2018 13:54:44 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86,perf: Disable intel_bts when PTI |
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* Greg KH <greg@kroah.com> 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 <alexander.shishkin@linux.intel.com> > > Reported-by: Vince Weaver <vincent.weaver@maine.edu> > > Reported-by: Robert Święcki <robert@swiecki.net> > > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> > > Can you add a: > Cc: stable <stable@vger.kernel.org> > 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.)
There are 28 new commits in tip:x86/pti that will (hopefully) go upstream later today.
Thanks,
Ingo
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