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Fri, 5 Jun 2026 07:25:54 +0000 (GMT) Received: from vaibhav?linux.ibm.com (unknown [9.124.210.197]) by smtpav02.dal12v.mail.ibm.com (Postfix) with SMTP; Fri, 5 Jun 2026 07:25:54 +0000 (GMT) Received: by vaibhav@linux.ibm.com (sSMTP sendmail emulation); Fri, 05 Jun 2026 12:55:51 +0530 From: Vaibhav Jain To: Gautam Menghani , Amit Machhiwal Cc: linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan , Harsh Prateek Bora , Ritesh Harjani , Anushree Mathur , Nicholas Piggin , Michael Ellerman , "Christophe Leroy (CS GROUP)" , kvm@vger.kernel.org, stable@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] KVM: PPC: Book3S HV: Validate arch_compat against host compatibility mode In-Reply-To: References: <20260603141539.47620-1-amachhiw@linux.ibm.com> Date: Fri, 05 Jun 2026 12:55:50 +0530 Message-ID: <87ldctmosh.fsf@vajain21.in.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: dv5klJ00atjHlKCI-UFdB4mmsQNPGgcc X-Authority-Analysis: v=2.4 cv=fv/sol4f c=1 sm=1 tr=0 ts=6a227a0b cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=HbV5RZ6GBX0UAL49VfYA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA1MDA2NyBTYWx0ZWRfX6Pauc09m9wfW lREhGXSC8k5WPPwar/rFBYTfumn2ZYC3/MwHi9xgcEYsqVQVtBxgHNnpkhaz/yZAEYbmTy47MuZ x/sx2lERWbF2y1ZBoXsujP5svAqfBwCfJakcmyb0I2BUll5rkiMmTsHSOaC0Hu+c/NkDY9oqrOI s39QtqcCuwZ+I+qHP2te4N0jMMV/uUnLHdAQat2ZG7Kchw3sYPWQnJK/93wMZAEiUmL7+PWUA34 MoAhH4X/kQmJpfh+knmjXh+NecJPZC1Jy+8qp1lXwGTtDowoEtIuY575Y0RFCtV0TXYd+KxDk/3 04eJ/gf8igbFUSeZoA+GDel9SMgQfEkK2Ud5J1O0xZrrVQ4RWe2vb+UmVO/5Z+8ZvEbF1MbmMGs vyzV06dynj+qrNr012r6q68Xz0F7++fqGlSDWbsrl8ppR/6I3uIyxa+6uiYPuGZhCEJgC+8UldR rnvAejQtL9DB/VSIc1w== X-Proofpoint-ORIG-GUID: tTAjuvZJ11_b-xicIG6gnOOavGc8y1HC 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=2026-06-05_01,2026-05-28_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=1011 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-2606050067 Hi Gautam, Thanks for testing this patch. Few questions: Gautam Menghani writes: > On Wed, Jun 03, 2026 at 07:45:39PM +0530, Amit Machhiwal wrote: >> On IBM POWER systems, newer processor generations can operate in >> compatibility modes corresponding to earlier generations. This becomes >> relevant for nested virtualization, where nested KVM guests may need to >> run with a specific processor compatibility level. >> > > I booted a KVM guest on LPAR with this patch in the following scenarios: > 3. P11 guest on P11 host booted in P10 compat mode: No error observed This should have resulted in an error since booting a P11 guest on P10 compat mode host is not allowed with/without this patch. Can you please check your test env and share the boot results. > > Tested-by: Gautam Menghani -- Cheers ~ Vaibhav