Hi Peter, Please help review these minor perf/x86 changes in this patch set, and we need some of them to support Guest Architectural LBR in KVM.
This version keeps reserve_lbr_buffers() as is because the LBR xsave buffer is a per-CPU buffer, not a per-event buffer. We only need to allocate the buffer once when initializing the first event. If you are interested in the KVM emulation, please check https://lore.kernel.org/kvm/20210314155225.206661-1-like...@linux.intel.com/ Please check more details in each commit and feel free to comment. Previous: https://lore.kernel.org/lkml/20210322060635.821531-1-like...@linux.intel.com/ v4->v5 Changelog: - Add "Tested-by: Kan Liang" - Make the commit message simpler - Make check_msr() to ignore msr==0 - Use kmem_cache_alloc_node() [Namhyung] Like Xu (5): perf/x86/intel: Fix the comment about guest LBR support on KVM perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers perf/x86: Skip checking MSR for MSR 0x000 perf/x86/lbr: Move cpuc->lbr_xsave allocation out of sleeping region perf/x86: Move ARCH_LBR_CTL_MASK definition to include/asm/msr-index.h arch/x86/events/core.c | 8 +++++--- arch/x86/events/intel/bts.c | 2 +- arch/x86/events/intel/core.c | 7 +++---- arch/x86/events/intel/lbr.c | 29 ++++++++++++++++++----------- arch/x86/events/perf_event.h | 8 +++++++- arch/x86/include/asm/msr-index.h | 1 + 6 files changed, 35 insertions(+), 20 deletions(-) -- 2.29.2
