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X-CSE-ConnectionGUID: LGtDhSE1TCqITSHr66whrw== X-CSE-MsgGUID: 9jxLoEc9RkKef49oWNSzVw== X-IronPort-AV: E=McAfee;i="6800,10657,11577"; a="62434274" X-IronPort-AV: E=Sophos;i="6.19,217,1754982000"; d="scan'208";a="62434274" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Oct 2025 17:47:23 -0700 X-CSE-ConnectionGUID: Yk8PsyMMRRepxbxnTGcngg== X-CSE-MsgGUID: f+0bBtuaSQK7CZA6fKmccQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,217,1754982000"; d="scan'208";a="185225279" Received: from unknown (HELO [10.238.2.75]) ([10.238.2.75]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Oct 2025 17:47:20 -0700 Message-ID: Date: Fri, 10 Oct 2025 08:47:18 +0800 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: REGRESSION on linux-next (next-20250919) To: Sean Christopherson Cc: Chaitanya Kumar Borah , "intel-gfx@lists.freedesktop.org" , "intel-xe@lists.freedesktop.org" , Suresh Kumar Kurmi , Jani Saarinen , lucas.demarchi@intel.com, linux-perf-users@vger.kernel.org, kvm@vger.kernel.org References: <70b64347-2aca-4511-af78-a767d5fa8226@intel.com> <25af94f5-79e3-4005-964e-e77b1320a16e@linux.intel.com> <3bbc4e6d-9f52-483c-a25d-166dca62fb25@intel.com> <00d0f3f3-d2b4-4885-9a49-5e6f8390142b@intel.com> Content-Language: en-US From: "Mi, Dapeng" In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 10/9/2025 8:58 PM, Sean Christopherson wrote: > On Thu, Oct 09, 2025, Dapeng Mi wrote: >> On 10/7/2025 2:22 PM, Borah, Chaitanya Kumar wrote: >>> Hi, >>> >>> On 10/6/2025 1:33 PM, Borah, Chaitanya Kumar wrote: >>>> Thank you for your responses. >>>> >>>> Following change fixes the issue for us. >>>> >>>> >>>> diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c >>>> index 40ac4cb44ed2..487ad19a236e 100644 >>>> --- a/arch/x86/kvm/pmu.c >>>> +++ b/arch/x86/kvm/pmu.c >>>> @@ -108,16 +108,18 @@ void kvm_init_pmu_capability(const struct >>>> kvm_pmu_ops *pmu_ops) >>>>         bool is_intel = boot_cpu_data.x86_vendor == X86_VENDOR_INTEL; >>>>         int min_nr_gp_ctrs = pmu_ops->MIN_NR_GP_COUNTERS; >>>> >>>> -       perf_get_x86_pmu_capability(&kvm_host_pmu); >>>> - >>>>         /* >>>>          * Hybrid PMUs don't play nice with virtualization without careful >>>>          * configuration by userspace, and KVM's APIs for reporting >>>> supported >>>>          * vPMU features do not account for hybrid PMUs.  Disable vPMU >>>> support >>>>          * for hybrid PMUs until KVM gains a way to let userspace opt-in. >>>>          */ >>>> -       if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU)) >>>> +       if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU)) { >>>>                 enable_pmu = false; >>>> +               memset(&kvm_host_pmu, 0, sizeof(kvm_host_pmu)); >>>> +       } else { >>>> +               perf_get_x86_pmu_capability(&kvm_host_pmu); >>>> +       } >>> Can we expect a formal patch soon? >> I'd like to post a patch to fix this tomorrow if Sean has no bandwidth on >> this. Thanks. > Sorry, my bad, I was waiting for you to post a patch, but that wasn't at all > clear. So yeah, go ahead and post one :-) Sure. Would post it now.