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Tue, 2 Jun 2026 17:11:50 +0000 (GMT) Message-ID: <24f1fa9b-0a7a-4ac7-92b8-beeffba0f2d9@linux.ibm.com> Date: Tue, 2 Jun 2026 22:41:49 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4] 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, stable@vger.kernel.org, Sean Christopherson References: <20260602121706.8423-1-gautam@linux.ibm.com> From: Harsh Prateek Bora In-Reply-To: <20260602121706.8423-1-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: Rtv5OuCeLvjfobDFb5h17ywAR5MugAZ5 X-Authority-Analysis: v=2.4 cv=fv/sol4f c=1 sm=1 tr=0 ts=6a1f0edd cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=f7IdgyKtn90A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VwQbUJbxAAAA:8 a=1XWaLZrsAAAA:8 a=VnNF1IyMAAAA:8 a=CVMXPQV5iiZ5r4vfs10A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjAyMDE2NSBTYWx0ZWRfX7gINC3/mLhqn QzrX215nBn7FHHVG/KIjeG13puvP95fO+nbtpmuRXA+io9ozEjwuNpCRPye58A+ezGGq01TToJF /YH+dH5I9PJxePOMcfeFO9Tlq6g4MlqUoYNEI2rx9lO4/3O4PSBaLOnigzD2LdlMjSfNtMVBCvn cVD6xyGDw1p5ao64r8BcOYigXTrptxPhEWcC6iLTBy9KGDlwpCgiTHg5XcZYMNc9ojnHyT0GHAr 5gei/jN2SVOtFyuGjUon71sXMAnMK8QaUmirpQ/c4NER0FQjkqkbqBTuiHWqmZpjbI52nX/i3Yr eYBE3P++QPvOGBqsTbsUMRUnOcTFxhD9XTfBsLtQQ6RrfSc7S2tF9IDSEgIgvoPoPiahpaqUtF0 9uSq9wwdcTit13u6HRB8uP8EdkQZJLeFlHED5wuhCxsXLt9uARguHaqnP89uN3Pii94x8ivnCoW t7BtKaoPW8mS7dSfl5A== X-Proofpoint-ORIG-GUID: 121pq332B56rG7m0DzarHzZJWv2xT6oS 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=2026-06-02_02,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 spamscore=0 phishscore=0 clxscore=1015 impostorscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606020165 On 02/06/26 5:47 pm, Gautam Menghani wrote: > Currently, CONFIG_VPA_PMU is not enabled by default, and consequently > cannot be used for KVM guests at all, unless explicitly enabled on > host kernel. > > Mark CONFIG_VPA_PMU as "default m" to ensure it is available when KVM is > being used. > > 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 > --- > v3 -> v4: > 1. Reword the patch description (Harsh) > Reviewed-by: Harsh Prateek Bora > v2 -> v3: > 1. Make CONFIG_VPA_PMU as default m so that it can separately disabled > (Sean) > > 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.