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authorPeter Zijlstra <peterz@infradead.org>2018-01-14 11:27:13 +0100
committerThomas Gleixner <tglx@linutronix.de>2018-01-14 11:42:10 +0100
commit99a9dc98ba52267ce5e062b52de88ea1f1b2a7d8 (patch)
tree6bd2808c08f2182cf046bf68e1a9db84e2d40e64 /include/linux
parenta237f762681e2a394ca67f21df2feb2b76a3609b (diff)
download96b-common-99a9dc98ba52267ce5e062b52de88ea1f1b2a7d8.tar.gz
x86,perf: Disable intel_bts when PTI
The intel_bts driver does not use the 'normal' BTS buffer which is exposed through 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. Fixing this requires to expose a mapping which is visible in all context and that's not trivial. As a quick fix disable this driver when PTI is enabled to prevent malfunction. Fixes: 385ce0ea4c07 ("x86/mm/pti: Add Kconfig") Reported-by: Vince Weaver <vincent.weaver@maine.edu> Reported-by: Robert Święcki <robert@swiecki.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: greg@kroah.com Cc: hughd@google.com Cc: luto@amacapital.net Cc: Vince Weaver <vince@deater.net> Cc: torvalds@linux-foundation.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20180114102713.GB6166@worktop.programming.kicks-ass.net
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