From: Sean Christopherson <seanjc@google.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Wanpeng Li <wanpengli@tencent.com>,
kvm@vger.kernel.org,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Guo Ren <guoren@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
linux-riscv@lists.infradead.org,
Vincent Chen <deanbo422@gmail.com>, Jiri Olsa <jolsa@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Stefano Stabellini <sstabellini@kernel.org>,
xen-devel@lists.xenproject.org, Marc Zyngier <maz@kernel.org>,
Joerg Roedel <joro@8bytes.org>,
x86@kernel.org, linux-csky@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, Ingo Molnar <mingo@redhat.com>,
Like Xu <like.xu.linux@gmail.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Zhu Lingshan <lingshan.zhu@intel.com>,
Will Deacon <will@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Borislav Petkov <bp@alien8.de>, Greentime Hu <green.hu@gmail.com>,
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Namhyung Kim <namhyung@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Artem Kashkanov <artem.kashkanov@intel.com>,
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Jim Mattson <jmattson@google.com>,
Juergen Gross <jgross@suse.com>, Nick Hu <nickhu@andestech.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Palmer Dabbelt <palmer@dabbelt.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: Re: [PATCH v2 00/13] perf: KVM: Fix, optimize, and clean up callbacks
Date: Fri, 17 Sep 2021 16:53:52 +0000 [thread overview]
Message-ID: <YUTIIG4ZCKMbqrFi@google.com> (raw)
In-Reply-To: <YURDqVZ1UXKCiKPV@hirez.programming.kicks-ass.net>
On Fri, Sep 17, 2021, Peter Zijlstra wrote:
> On Thu, Sep 16, 2021 at 09:37:43PM +0000, Sean Christopherson wrote:
> So I don't mind exporting __static_call_return0, but exporting a raw
> static_call is much like exporting a function pointer :/
Ya, that part is quite gross.
> > 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? :-)
I agree that many of the for-KVM exports are ugly, especially several of the
perf exports, but I will fight tooth and nail to keep KVM-as-a-module. It is
invaluable for development and testing, and in the not-too-distant future there
is KVM-maintenance related functionality that we'd like to implement that relies
on KVM being a module.
I would be more than happy to help explore approaches that reduce the for-KVM
exports, but I am strongly opposed to defeaturing KVM-as-a-module. I have a few
nascent ideas for eliminating a handful of a random exports, but no clever ideas
for eliminating perf's for-KVM exports.
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next prev parent reply other threads:[~2021-09-19 10:09 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-28 0:35 [PATCH v2 00/13] perf: KVM: Fix, optimize, and clean up callbacks 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
2021-09-17 16:53 ` Sean Christopherson [this message]
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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