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Sun, 31 May 2026 16:49:43 +0000 (GMT) Received: from smtpav03.dal12v.mail.ibm.com (smtpav03.dal12v.mail.ibm.com [10.241.53.102]) by smtprelay03.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 64VGnBKt65077522 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 31 May 2026 16:49:11 GMT Received: from smtpav03.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 63C3C5805A; Sun, 31 May 2026 16:49:41 +0000 (GMT) Received: from smtpav03.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 360E85803F; Sun, 31 May 2026 16:49:37 +0000 (GMT) Received: from [9.39.20.217] (unknown [9.39.20.217]) by smtpav03.dal12v.mail.ibm.com (Postfix) with ESMTP; Sun, 31 May 2026 16:49:36 +0000 (GMT) Message-ID: <47846f02-ba17-4a45-9bbc-550ba15ffd87@linux.ibm.com> Date: Sun, 31 May 2026 22:19:35 +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 v3] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM Content-Language: en-GB To: Gautam Menghani , maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, atrajeev@linux.ibm.com, stable@vger.kernel.org, Sean Christopherson References: <20260529141032.69559-1-gautam@linux.ibm.com> From: Harsh Prateek Bora In-Reply-To: <20260529141032.69559-1-gautam@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: zip5Ccdsfba4La2oXPnXLA6sUQTy0vaU X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTMxMDE3OSBTYWx0ZWRfX91iEnZPcStZZ K7quh3mxA+HNOa0ZZFK11rWkqVx945xXATstvva+hgNZsp+xdddxvE98pgFtdPP/br5uEu7+LJr JR1/1hsCN5fcweBfMWwFm1f8/71HrWGUKL2eO/3Y4DZDAjSHRkNrq3tBYDJ72IJ1olMhTZQa//2 ixiltEGUVl1Cy3Z0G1nivBmUWVKcT5eaDmQpeGLtuwyaLz/hggxkuwQKiXckw4g2Fd2yDgNCe7K beOOeIqizrNakt6X3vGpDAq5v8OQ2YgItvQ+JuV0ulr5sQxCVPiXQSkqNypy5DIj9MOkCnU5vhe lJKta/LvU3YluuHGgqyB2hyWzO344wxfv+tNcGLMLor8+HH5hB2iztvOCuCou+QzqCJX8CRPiS3 vcwPDVgqgz3VBWuKc05UAXl86fN4v50ZgzqRAk1ChdT6DPckkIw0p/6ec1GGtf3O71Kd4KN3hXY LawZyWZDve3e6D1mxyA== X-Proofpoint-ORIG-GUID: TJcW2ykqpNivEPAdUj-reQV25Dwq28FS X-Authority-Analysis: v=2.4 cv=Vf3H+lp9 c=1 sm=1 tr=0 ts=6a1c66a8 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=f7IdgyKtn90A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=1XWaLZrsAAAA:8 a=VnNF1IyMAAAA:8 a=_A65o6AHPVp_Dz6V974A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-05-31_05,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 adultscore=0 bulkscore=0 impostorscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2605310179 On 29/05/26 7:40 pm, Gautam Menghani wrote: > Currently, CONFIG_VPA_PMU is not enabled any of the configs, and Not sure what is meant by "any of the configs" , distros ? We could just say "not enabled by default" .. > consequently cannot be used for KVM guests at all. .. consequently cannot be used for KVM guests unless explicitly enabled on host kernel (which is currently ignored by distro configs)? > > Mark CONFIG_VPA_PMU as "default m" to ensure it is available when KVM is > being used. I think title could have been rephrased to focus on "default m" enablement. > > Fixes: 176cda0619b6c ("powerpc/perf: Add perf interface to expose vpa counters") > Cc: stable@vger.kernel.org # v6.13+ > Suggested-by: Sean Christopherson > Signed-off-by: Gautam Menghani > --- > v2 -> v3: > 1. Make CONFIG_VPA_PMU as default m so that it can separately disabled > (Sean) This indeed is more appropriate way for enablement, thanks Sean! regards, Harsh > > v1 -> v2: > 1. Rebased on latest master > > arch/powerpc/platforms/pseries/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig > index f7052b131a4c..74910ce3a541 100644 > --- a/arch/powerpc/platforms/pseries/Kconfig > +++ b/arch/powerpc/platforms/pseries/Kconfig > @@ -154,6 +154,7 @@ config HV_PERF_CTRS > config VPA_PMU > tristate "VPA PMU events" > depends on KVM_BOOK3S_64_HV && HV_PERF_CTRS > + default m > help > Enable access to the VPA PMU counters via perf. This enables > code that support measurement for KVM on PowerVM(KoP) feature.