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[35.185.214.157]) by smtp.gmail.com with ESMTPSA id t15sm4013977pgk.13.2021.09.16.14.37.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Sep 2021 14:37:47 -0700 (PDT) Date: Thu, 16 Sep 2021 21:37:43 +0000 From: Sean Christopherson To: Peter Zijlstra Subject: Re: [PATCH v2 00/13] perf: KVM: Fix, optimize, and clean up callbacks Message-ID: References: <20210828003558.713983-1-seanjc@google.com> <20210828201336.GD4353@worktop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210828201336.GD4353@worktop.programming.kicks-ass.net> X-Mailman-Approved-At: Fri, 17 Sep 2021 04:46:52 -0400 Cc: Wanpeng Li , kvm@vger.kernel.org, Alexander Shishkin , Catalin Marinas , Guo Ren , "H. Peter Anvin" , linux-riscv@lists.infradead.org, Vincent Chen , Jiri Olsa , Boris Ostrovsky , Stefano Stabellini , xen-devel@lists.xenproject.org, Marc Zyngier , Joerg Roedel , x86@kernel.org, linux-csky@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Ingo Molnar , Like Xu , Albert Ou , Zhu Lingshan , Will Deacon , Arnaldo Carvalho de Melo , Borislav Petkov , Greentime Hu , Paul Walmsley , Namhyung Kim , Thomas Gleixner , Artem Kashkanov , linux-arm-kernel@lists.infradead.org, Jim Mattson , Juergen Gross , Nick Hu , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Palmer Dabbelt , Paolo Bonzini , Vitaly Kuznetsov X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Sat, Aug 28, 2021, Peter Zijlstra wrote: > On Fri, Aug 27, 2021 at 05:35:45PM -0700, Sean Christopherson wrote: > > Like Xu (2): > > perf/core: Rework guest callbacks to prepare for static_call support > > perf/core: Use static_call to optimize perf_guest_info_callbacks > > > > Sean Christopherson (11): > > perf: Ensure perf_guest_cbs aren't reloaded between !NULL check and > > deref > > KVM: x86: Register perf callbacks after calling vendor's > > hardware_setup() > > KVM: x86: Register Processor Trace interrupt hook iff PT enabled in > > guest > > perf: Stop pretending that perf can handle multiple guest callbacks > > perf: Force architectures to opt-in to guest callbacks > > KVM: x86: Drop current_vcpu for kvm_running_vcpu + kvm_arch_vcpu > > variable > > KVM: x86: More precisely identify NMI from guest when handling PMI > > KVM: Move x86's perf guest info callbacks to generic KVM > > KVM: x86: Move Intel Processor Trace interrupt handler to vmx.c > > KVM: arm64: Convert to the generic perf callbacks > > KVM: arm64: Drop perf.c and fold its tiny bits of code into arm.c / > > pmu.c Argh, sorry, I somehow managed to miss all of your replies. I'll get back to this series next week. Thanks for the quick response! > Lets keep the whole intel_pt crud inside x86... In theory, I like the idea of burying intel_pt inside x86 (and even in Intel+VMX code for the most part), but the actual implementation is a bit gross. Because of the whole "KVM can be a module" thing, either the static call and __static_call_return0 would need to be exported, or a new register/unregister pair would have to be exported. The unregister path would also need its own synchronize_rcu(). In general, I don't love duplicating the logic, but it's not the end of the world. Either way works for me. Paolo or Peter, do either of you have a preference? > --- > Index: linux-2.6/arch/x86/events/core.c > =================================================================== > --- linux-2.6.orig/arch/x86/events/core.c > +++ linux-2.6/arch/x86/events/core.c > @@ -92,7 +92,7 @@ DEFINE_STATIC_CALL_RET0(x86_pmu_guest_ge > > DEFINE_STATIC_CALL_RET0(x86_guest_state, *(perf_guest_cbs->state)); > DEFINE_STATIC_CALL_RET0(x86_guest_get_ip, *(perf_guest_cbs->get_ip)); > -DEFINE_STATIC_CALL_RET0(x86_guest_handle_intel_pt_intr, *(perf_guest_cbs->handle_intel_pt_intr)); > +DEFINE_STATIC_CALL_RET0(x86_guest_handle_intel_pt_intr, unsigned int (*)(void)); FWIW, the param needs to be a raw function, not a function pointer. _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm