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AKwUvBxRZZ7ivcpF9Tqp6HMSMKh9Az73wbVXY2apjOwjTOp5uGA5JZjQ1F/y7Xt1aPiBzYeGKvjnAZEuQc1ugqQ=@vger.kernel.org X-Gm-Message-State: AFuF++mDgV1BVMNma/j8kfKvS7W8Po5xCvfnBdKDN0aIdXhkdtTQj0FJ etZfX6nfI3lkwHhIfgoxEOU757bFFNccRVQbK9CSEmrKGbrM3mJKy/GK+FVndZNpb0FoU0U4K3f G3TjwxA== X-Received: from pgmm13.prod.google.com ([2002:a05:6a02:550d:b0:cc4:a477:43cc]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:bea6:b0:3cd:9bb1:c6f5 with SMTP id adf61e73a8af0-3daed1fa6f1mr77071637.10.1789063004860; Thu, 10 Sep 2026 10:56:44 -0700 (PDT) Date: Thu, 10 Sep 2026 10:56:44 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260508231353.406465-1-seanjc@google.com> Message-ID: Subject: Re: [PATCH v3 0/9] perf/x86: Don't write PEBS_ENABLED on KVM transitions From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Paolo Bonzini , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Jim Mattson , Mingwei Zhang , Stephane Eranian , Dapeng Mi Content-Type: text/plain; charset="us-ascii" On Thu, Aug 06, 2026, Sean Christopherson wrote: > On Fri, May 08, 2026, Sean Christopherson wrote: > > Sean Christopherson (9): > > perf/x86/intel: Ensure guest PEBS path doesn't set unwanted > > PERF_GLOBAL_CTRL bits > > perf/x86/intel: Don't write PEBS_ENABLED on host<=>guest xfers if CPU > > has isolation > > perf/x86/intel: Don't context switch DS_AREA (and PEBS config) if PEBS > > is unused > > perf/x86/intel: Make @data a mandatory param for > > intel_guest_get_msrs() > > perf/x86/intel: Invert names of intel_ctrl_{guest,host}_mask > > perf/x86: KVM: Have perf define a dedicated struct for getting guest > > PEBS data > > perf/x86/intel: KVM: Handle cross-mapped PEBS PMCs entirely within KVM > > KVM: VMX: Drop a redundant pmu->global_ctrl check when processing > > pebs_enable > > KVM: VMX: Only tell perf to enable PEBS counters for fully enabled > > PMCs > > > > arch/x86/events/core.c | 5 +- > > arch/x86/events/intel/core.c | 92 +++++++++++++++++++------------ > > arch/x86/events/intel/lbr.c | 2 +- > > arch/x86/events/perf_event.h | 7 ++- > > arch/x86/include/asm/kvm_host.h | 9 --- > > arch/x86/include/asm/perf_event.h | 11 +++- > > arch/x86/kvm/vmx/pmu_intel.c | 28 +++++++--- > > arch/x86/kvm/vmx/vmx.c | 10 ++-- > > arch/x86/kvm/vmx/vmx.h | 15 ++++- > > 9 files changed, 114 insertions(+), 65 deletions(-) > > Ping. This still applies on Linus' tree and against tip/master. Ping again. This fixes a real issue and IMO provides much-needed improvements for the KVM<=>perf APIs.