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Tue, 26 May 2026 07:00:49 +0000 (GMT) Received: from smtpav06.dal12v.mail.ibm.com (smtpav06.dal12v.mail.ibm.com [10.241.53.105]) by smtprelay06.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 64Q70lqX16122604 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 26 May 2026 07:00:48 GMT Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A7BCA58059; Tue, 26 May 2026 07:00:47 +0000 (GMT) Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 73A285805D; Tue, 26 May 2026 07:00:44 +0000 (GMT) Received: from [9.123.0.169] (unknown [9.123.0.169]) by smtpav06.dal12v.mail.ibm.com (Postfix) with ESMTP; Tue, 26 May 2026 07:00:44 +0000 (GMT) Message-ID: <40b7656b-52ef-4140-b6e3-e034fd44a4fd@linux.ibm.com> Date: Tue, 26 May 2026 12:30:43 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] KVM: PPC: Kconfig: Enable CONFIG_VPA_PMU with KVM Content-Language: en-GB To: Gautam Menghani , maddy@linux.ibm.com, npiggin@gmail.com, mpe@ellerman.id.au, chleroy@kernel.org, atrajeev@linux.ibm.com Cc: linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260518044150.34632-1-gautam@linux.ibm.com> From: Harsh Prateek Bora In-Reply-To: <20260518044150.34632-1-gautam@linux.ibm.com> Content-Type: text/plain; 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Currently, the > vpa-pmu driver cannot be used since it is not enabled in distro configs. > I think the commit log needs a rephrase as irrespective of current state of distro configs, it makes sense to enable CONFIG_VPA_PMU for KVM guests on Power by default since this is the only use-case for VPA counters (i.e. in a KVM guest). > On fedora kernel 6.13.7, the config option is disabled: > $ cat /boot/config-6.19.12-200.fc43.ppc64le | grep VPA_PMU > # CONFIG_VPA_PMU is not set > > Fixes: 176cda0619b6c ("powerpc/perf: Add perf interface to expose vpa counters") > Cc: stable@vger.kernel.org # v6.13+ > Signed-off-by: Gautam Menghani > --- > v1 -> v2: > 1. Rebased on latest master > > arch/powerpc/kvm/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig > index 9a0d1c1aca6c..56e86b46ff13 100644 > --- a/arch/powerpc/kvm/Kconfig > +++ b/arch/powerpc/kvm/Kconfig > @@ -82,6 +82,7 @@ config KVM_BOOK3S_64_HV > select KVM_BOOK3S_HV_POSSIBLE > select KVM_BOOK3S_HV_PMU > select CMA > + select VPA_PMU if HV_PERF_CTRS Also, since we already select KVM_BOOK3S_HV_PMU, VPA_PMU is a natural extension, provided we enable only if the required dependecy is enabled. With an update to the changelog with suggested rationale: Reviewed-by: Harsh Prateek Bora > help > Support running unmodified book3s_64 guest kernels in > virtual machines on POWER7 and newer processors that have