Messages in this thread | | | Date | Mon, 16 Feb 2015 08:48:40 +0100 | From | Ingo Molnar <> | Subject | [GIT PULL] perf x86 updates for v3.20 |
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Linus,
Please pull the latest perf-core-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-core-for-linus
# HEAD: a66734297f78707ce39d756b656bfae861d53f62 perf/x86: Add /sys/devices/cpu/rdpmc=2 to allow rdpmc for all tasks
( I'm sending these changes from Andy Lutomirski separately because they were based on other bits that went upstream in this cycle. )
This series tightens up RDPMC permissions: currently even highly sandboxed x86 execution environments (such as seccomp) have permission to execute RDPMC, which may leak various perf events / PMU state such as timing information and other CPU execution details.
This 'all is allowed' RDPMC mode is still preserved as the (non-default) /sys/devices/cpu/rdpmc=2 setting. The new default is that RDPMC access is only allowed if a perf event is mmap-ed (which is needed to correctly interpret RDPMC counter values in any case).
As a side effect of these changes CR4 handling is cleaned up in the x86 code and a shadow copy of the CR4 value is added.
The extra CR4 manipulation adds ~ <50ns to the context switch cost between rdpmc-capable and rdpmc-non-capable mms.
( Note: shortlog and diffstat created manually due to the somewhat unusual merge base - hopefully the result is still fine. )
Thanks,
Ingo
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Andy Lutomirski (7): x86: Clean up cr4 manipulation x86: Store a per-cpu shadow copy of CR4 x86: Add a comment clarifying LDT context switching perf: Add pmu callbacks to track event mapping and unmapping perf: Pass the event to arch_perf_update_userpage() perf/x86: Only allow rdpmc if a perf_event is mapped perf/x86: Add /sys/devices/cpu/rdpmc=2 to allow rdpmc for all tasks
Ingo Molnar (1): Merge branch 'x86/asm' into perf/x86, to avoid conflicts with upcoming patches
arch/x86/include/asm/mmu.h | 2 ++ arch/x86/include/asm/mmu_context.h | 33 +++++++++++++++++++++----- arch/x86/include/asm/paravirt.h | 6 ++--- arch/x86/include/asm/processor.h | 33 -------------------------- arch/x86/include/asm/special_insns.h | 6 ++--- arch/x86/include/asm/tlbflush.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++------ arch/x86/include/asm/virtext.h | 5 ++-- arch/x86/kernel/acpi/sleep.c | 2 +- arch/x86/kernel/cpu/common.c | 17 ++++++++++---- arch/x86/kernel/cpu/mcheck/mce.c | 3 ++- arch/x86/kernel/cpu/mcheck/p5.c | 3 ++- arch/x86/kernel/cpu/mcheck/winchip.c | 3 ++- arch/x86/kernel/cpu/mtrr/cyrix.c | 6 ++--- arch/x86/kernel/cpu/mtrr/generic.c | 6 ++--- arch/x86/kernel/cpu/perf_event.c | 76 +++++++++++++++++++++++++++++++++++++++++++++-------------- arch/x86/kernel/cpu/perf_event.h | 2 ++ arch/x86/kernel/head32.c | 1 + arch/x86/kernel/head64.c | 2 ++ arch/x86/kernel/i387.c | 3 ++- arch/x86/kernel/process.c | 5 ++-- arch/x86/kernel/process_32.c | 2 +- arch/x86/kernel/process_64.c | 2 +- arch/x86/kernel/setup.c | 2 +- arch/x86/kernel/xsave.c | 3 ++- arch/x86/kvm/svm.c | 2 +- arch/x86/kvm/vmx.c | 10 ++++---- arch/x86/mm/fault.c | 2 +- arch/x86/mm/init.c | 13 ++++++++-- arch/x86/mm/tlb.c | 3 --- arch/x86/power/cpu.c | 11 ++++----- arch/x86/realmode/init.c | 2 +- arch/x86/xen/enlighten.c | 4 ++-- drivers/lguest/x86/core.c | 5 ++-- include/linux/perf_event.h | 7 ++++++ kernel/events/core.c | 14 +++++++++-- 35 files changed, 253 insertions(+), 120 deletions(-)
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