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Alexander Shishkin 0ce2b3ecdc perf/x86/intel: Fix PT PMI handling 
[ Upstream commit 92ca7da4bd ]

Commit:

  ccbebba4c6 ("perf/x86/intel/pt: Bypass PT vs. LBR exclusivity if the core supports it")

skips the PT/LBR exclusivity check on CPUs where PT and LBRs coexist, but
also inadvertently skips the active_events bump for PT in that case, which
is a bug. If there aren't any hardware events at the same time as PT, the
PMI handler will ignore PT PMIs, as active_events reads zero in that case,
resulting in the "Uhhuh" spurious NMI warning and PT data loss.

Fix this by always increasing active_events for PT events.

Fixes: ccbebba4c6 ("perf/x86/intel/pt: Bypass PT vs. LBR exclusivity if the core supports it")
Reported-by: Vitaly Slobodskoy <vitaly.slobodskoy@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lkml.kernel.org/r/20191210105101.77210-1-alexander.shishkin@linux.intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12 12:21:36 +01:00
..
boot
x86, efi: Never relocate kernel below lowest acceptable address
2019-10-31 09:40:19 +01:00
configs
x86/defconfigs: Remove useless UEVENT_HELPER_PATH
2019-06-21 19:22:08 +02:00
crypto
crypto: x86/aes-ni - use AES library instead of single-use AES cipher
2019-09-09 23:48:41 +10:00
entry
x86/entry/32: Fix FIXUP_ESPFIX_STACK with user CR3
2019-11-29 10:10:00 +01:00
events
perf/x86/intel: Fix PT PMI handling
2020-01-12 12:21:36 +01:00
hyperv
x86/hyperv: Make vapic support x2apic mode
2019-10-15 10:57:09 +02:00
ia32
clone: fix CLONE_PIDFD support
2019-07-14 20:36:12 +02:00
include
x86/crash: Add a forward declaration of struct kimage
2019-12-31 16:45:27 +01:00
kernel
x86/intel: Disable HPET on Intel Ice Lake platforms
2020-01-12 12:21:13 +01:00
kvm
kvm: x86: Host feature SSBD doesn't imply guest feature AMD_SSBD
2019-12-31 16:46:23 +01:00
lib
x86/insn: Add some Intel instructions to the opcode map
2019-12-31 16:45:40 +01:00
math-emu
x86/math-emu: Check __copy_from_user() result
2019-12-31 16:43:32 +01:00
mm
mm/memory_hotplug: shrink zones when offlining memory
2020-01-09 10:19:56 +01:00
net
bpf: fix x64 JIT code generation for jmp to 1st insn
2019-08-01 13:12:09 -07:00
oprofile
…
pci
x86/PCI: Avoid AMD FCH XHCI USB PME# from D0 defect
2019-12-13 08:42:46 +01:00
platform
x86/efi: Update e820 with reserved EFI boot services data to fix kexec breakage
2020-01-12 12:21:15 +01:00
power
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-09-17 12:04:39 -07:00
purgatory
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-09-28 13:37:41 -07:00
ras
…
realmode
x86/realmode: Remove trampoline_status
2019-07-22 11:30:18 +02:00
tools
x86/insn: Fix awk regexp warnings
2019-11-29 10:09:45 +01:00
um
um: Use real DMA barriers
2019-09-15 21:37:14 +02:00
video
…
xen
x86/xen/32: Simplify ring check in xen_iret_crit_fixup()
2019-11-29 10:09:50 +01:00
.gitignore
…
Kbuild
…
Kconfig
x86/tsx: Add config options to set tsx=on|off|auto
2019-10-28 09:12:18 +01:00
Kconfig.cpu
x86/cpu: Create Zhaoxin processors architecture support file
2019-06-22 11:45:57 +02:00
Kconfig.debug
x86, perf: Fix the dependency of the x86 insn decoder selftest
2019-09-02 20:05:58 +02:00
Makefile
x86/build: Add -Wnoaddress-of-packed-member to REALMODE_CFLAGS, to silence GCC9 build warning
2019-08-28 17:31:31 +02:00
Makefile_32.cpu
…
Makefile.um
…