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linux-stable/arch/arm64
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Alexandru Elisei 490d7b7c08 arm64: perf: Add missing ISB in armv8pmu_enable_counter() 
Writes to the PMXEVTYPER_EL0 register are not self-synchronising. In
armv8pmu_enable_event(), the PE can reorder configuring the event type
after we have enabled the counter and the interrupt. This can lead to an
interrupt being asserted because of the previous event type that we were
counting using the same counter, not the one that we've just configured.

The same rationale applies to writes to the PMINTENSET_EL1 register. The PE
can reorder enabling the interrupt at any point in the future after we have
enabled the event.

Prevent both situations from happening by adding an ISB just before we
enable the event counter.

Fixes: 030896885a ("arm64: Performance counters support")
Reported-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Tested-by: Sumit Garg <sumit.garg@linaro.org> (Developerbox)
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200924110706.254996-2-alexandru.elisei@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
2020-09-28 19:00:16 +01:00
..
boot arm64: dts: k3-am65: Update the RM resource types 2020-08-16 22:01:20 +01:00
configs ARM: SoC driver updates for v5.9 2020-08-03 19:30:59 -07:00
crypto crypto: arm64/gcm - use inline helper to suppress indirect calls 2020-07-09 22:14:32 +10:00
include arm64: perf: Add support caps under sysfs 2020-09-28 14:53:45 +01:00
kernel arm64: perf: Add missing ISB in armv8pmu_enable_counter() 2020-09-28 19:00:16 +01:00
kvm - Fix kernel build with the integrated LLVM assembler which doesn't 2020-08-28 11:37:33 -07:00
lib Merge branch 'rwonce/rework' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux 2020-06-10 14:46:54 -07:00
mm treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
net bpf, arm64: Add BPF exception tables 2020-07-31 00:43:40 +02:00
xen arm64: xen: Use modern annotations for assembly functions 2020-01-09 16:09:42 +00:00
Kbuild
Kconfig KVM/arm64 updates for Linux 5.9: 2020-08-09 12:58:23 -04:00
Kconfig.debug arm64: remove TEXT_OFFSET randomization 2020-06-15 13:10:59 +01:00
Kconfig.platforms ARM: new SoC support for v5.9 2020-08-03 19:38:30 -07:00
Makefile arm64: vdso32: make vdso32 install conditional 2020-08-28 13:18:48 +01:00