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![]() Pull x86 perf updates from Ingo Molnar: "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" * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86: Add /sys/devices/cpu/rdpmc=2 to allow rdpmc for all tasks perf/x86: Only allow rdpmc if a perf_event is mapped perf: Pass the event to arch_perf_update_userpage() perf: Add pmu callbacks to track event mapping and unmapping x86: Add a comment clarifying LDT context switching x86: Store a per-cpu shadow copy of CR4 x86: Clean up cr4 manipulation |
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.. | ||
assigned-dev.c | ||
assigned-dev.h | ||
cpuid.c | ||
cpuid.h | ||
emulate.c | ||
i8254.c | ||
i8254.h | ||
i8259.c | ||
ioapic.c | ||
ioapic.h | ||
iommu.c | ||
irq.c | ||
irq.h | ||
irq_comm.c | ||
Kconfig | ||
kvm_cache_regs.h | ||
lapic.c | ||
lapic.h | ||
Makefile | ||
mmu.c | ||
mmu.h | ||
mmu_audit.c | ||
mmutrace.h | ||
paging_tmpl.h | ||
pmu.c | ||
svm.c | ||
trace.h | ||
tss.h | ||
vmx.c | ||
x86.c | ||
x86.h |