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From: Peter Zijlstra <peterz@infradead.org>
To: Sean Christopherson <seanjc@google.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Marc Zyngier <maz@kernel.org>, Guo Ren <guoren@kernel.org>,
Nick Hu <nickhu@andestech.com>, Greentime Hu <green.hu@gmail.com>,
Vincent Chen <deanbo422@gmail.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>,
x86@kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Stefano Stabellini <sstabellini@kernel.org>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org,
linux-riscv@lists.infradead.org, kvm@vger.kernel.org,
xen-devel@lists.xenproject.org,
Artem Kashkanov <artem.kashkanov@intel.com>,
Like Xu <like.xu.linux@gmail.com>,
Zhu Lingshan <lingshan.zhu@intel.com>
Subject: Re: [PATCH v2 00/13] perf: KVM: Fix, optimize, and clean up callbacks
Date: Fri, 17 Sep 2021 09:28:41 +0200 [thread overview]
Message-ID: <YURDqVZ1UXKCiKPV@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <YUO5J/jTMa2KGbsq@google.com>
On Thu, Sep 16, 2021 at 09:37:43PM +0000, Sean Christopherson wrote:
> On Sat, Aug 28, 2021, Peter Zijlstra wrote:
> 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,
ARGH!! we should really fix that. I've heard other archs have made much
better choices here.
> either
> the static call and __static_call_return0 would need to be exported,
> or a new register/unregister pair would have to be exported.
So I don't mind exporting __static_call_return0, but exporting a raw
static_call is much like exporting a function pointer :/
> 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?
Can we de-feature kvm as a module and only have this PT functionality
when built-in? :-)
> > ---
> > 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.
Yeah, I keep making that mistake.. and I wrote the bloody thing :/
I have a 'fix' for that, but I need to finish that and also flag-day
change :-(
https://lkml.kernel.org/r/YS+0eIeAJsRRArk4@hirez.programming.kicks-ass.net
next prev parent reply other threads:[~2021-09-17 7:29 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-28 0:35 Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 01/13] perf: Ensure perf_guest_cbs aren't reloaded between !NULL check and deref Sean Christopherson
2021-08-28 19:44 ` Peter Zijlstra
2021-09-16 21:41 ` Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 02/13] KVM: x86: Register perf callbacks after calling vendor's hardware_setup() Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 03/13] KVM: x86: Register Processor Trace interrupt hook iff PT enabled in guest Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 04/13] perf: Stop pretending that perf can handle multiple guest callbacks Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 05/13] perf: Force architectures to opt-in to " Sean Christopherson
2021-08-28 19:47 ` Peter Zijlstra
2021-09-16 22:30 ` Sean Christopherson
2021-09-21 16:44 ` Paolo Bonzini
2021-09-21 21:29 ` Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 06/13] perf/core: Rework guest callbacks to prepare for static_call support Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 07/13] perf/core: Use static_call to optimize perf_guest_info_callbacks Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 08/13] KVM: x86: Drop current_vcpu for kvm_running_vcpu + kvm_arch_vcpu variable Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 09/13] KVM: x86: More precisely identify NMI from guest when handling PMI Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 10/13] KVM: Move x86's perf guest info callbacks to generic KVM Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 11/13] KVM: x86: Move Intel Processor Trace interrupt handler to vmx.c Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 12/13] KVM: arm64: Convert to the generic perf callbacks Sean Christopherson
2021-08-28 0:35 ` [PATCH v2 13/13] KVM: arm64: Drop perf.c and fold its tiny bits of code into arm.c / pmu.c Sean Christopherson
2021-08-28 20:13 ` [PATCH v2 00/13] perf: KVM: Fix, optimize, and clean up callbacks Peter Zijlstra
2021-09-16 21:37 ` Sean Christopherson
2021-09-17 7:28 ` Peter Zijlstra [this message]
2021-09-17 16:53 ` Sean Christopherson
2021-09-20 12:05 ` Paolo Bonzini
2021-09-20 12:22 ` Marc Zyngier
2021-09-20 13:18 ` Paolo Bonzini
2021-09-20 13:40 ` Marc Zyngier
2021-09-20 18:22 ` Paolo Bonzini
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