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[2620:137:e000::1:20]) by mx.google.com with ESMTP id i5si1095308pli.413.2022.02.04.00.14.55; Fri, 04 Feb 2022 00:15:08 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=desiato.20200630 header.b=oOIEYjuI; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345113AbiBBOni (ORCPT + 99 others); Wed, 2 Feb 2022 09:43:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345074AbiBBOna (ORCPT ); Wed, 2 Feb 2022 09:43:30 -0500 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E725C061714; Wed, 2 Feb 2022 06:43:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=xufQ1Q9+1ygsCDJZkQhhHAWRleHJVLLr4QMMU3vcj5Y=; b=oOIEYjuILakE8XqGmGL6SEPV+T k3Z1T7J1Ni4TDwlzj9JH+w9eKYjh7JvxasFf6ZJvIa1yph2ueVL7S4jDGsdYSN9mZ3IcgWkHFaLYg 5NgkC7K5e+UqFO0+2x1Gwk8mNXl9ip5gkrlIxJ1PbFckCa8t2JQJE4Hu5IgScl4LFXPizKTY00Fgd K2eEWXOMF6GJyrBZPoZPeNdjl1ITT+Z0Wu8qEw3CwTR0OPepSXztO4T1QFIA/FlvBlj8n6JjwZSic PKN89hiqv0IjCAfwi3Y2kZrGCfE8XR3WGmv/BEIG9EnNWxYkZyB/nqi8XkLqJbnQsJxT8N80DSrny ehaJ2xrQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nFGqk-006Dr6-1S; Wed, 02 Feb 2022 14:43:10 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id A2626984C61; Wed, 2 Feb 2022 15:43:08 +0100 (CET) Date: Wed, 2 Feb 2022 15:43:08 +0100 From: Peter Zijlstra To: Like Xu Cc: Paolo Bonzini , Jim Mattson , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Like Xu Subject: Re: [PATCH kvm/queue v2 2/3] perf: x86/core: Add interface to query perfmon_event_map[] directly Message-ID: <20220202144308.GB20638@worktop.programming.kicks-ass.net> References: <20220117085307.93030-1-likexu@tencent.com> <20220117085307.93030-3-likexu@tencent.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220117085307.93030-3-likexu@tencent.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 17, 2022 at 04:53:06PM +0800, Like Xu wrote: > From: Like Xu > > Currently, we have [intel|knc|p4|p6]_perfmon_event_map on the Intel > platforms and amd_[f17h]_perfmon_event_map on the AMD platforms. > > Early clumsy KVM code or other potential perf_event users may have > hard-coded these perfmon_maps (e.g., arch/x86/kvm/svm/pmu.c), so > it would not make sense to program a common hardware event based > on the generic "enum perf_hw_id" once the two tables do not match. > > Let's provide an interface for callers outside the perf subsystem to get > the counter config based on the perfmon_event_map currently in use, > and it also helps to save bytes. > > Cc: Peter Zijlstra > Signed-off-by: Like Xu > --- > arch/x86/events/core.c | 9 +++++++++ > arch/x86/include/asm/perf_event.h | 2 ++ > 2 files changed, 11 insertions(+) > > diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c > index 38b2c779146f..751048f4cc97 100644 > --- a/arch/x86/events/core.c > +++ b/arch/x86/events/core.c > @@ -693,6 +693,15 @@ void x86_pmu_disable_all(void) > } > } > > +u64 perf_get_hw_event_config(int perf_hw_id) > +{ > + if (perf_hw_id < x86_pmu.max_events) > + return x86_pmu.event_map(perf_hw_id); > + > + return 0; > +} Where does perf_hw_id come from? Does this need to be array_index_nospec() ? > +EXPORT_SYMBOL_GPL(perf_get_hw_event_config); Urgh... hate on kvm being a module again. We really need something like EXPORT_SYMBOL_KVM() or something. > struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr) > { > return static_call(x86_pmu_guest_get_msrs)(nr); > diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h > index 8fc1b5003713..d1e325517b74 100644 > --- a/arch/x86/include/asm/perf_event.h > +++ b/arch/x86/include/asm/perf_event.h > @@ -492,9 +492,11 @@ static inline void perf_check_microcode(void) { } > > #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) > extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr); > +extern u64 perf_get_hw_event_config(int perf_hw_id); > extern int x86_perf_get_lbr(struct x86_pmu_lbr *lbr); > #else > struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr); > +u64 perf_get_hw_event_config(int perf_hw_id); I think Paolo already spotted this one. > static inline int x86_perf_get_lbr(struct x86_pmu_lbr *lbr) > { > return -1; > -- > 2.33.1 >