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Fri, 17 Oct 2025 14:49:29 GMT Received: from smtpav01.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1316458059; Fri, 17 Oct 2025 14:49:29 +0000 (GMT) Received: from smtpav01.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DE57058058; Fri, 17 Oct 2025 14:49:24 +0000 (GMT) Received: from b35lp69.lnxne.boe (unknown [9.152.108.100]) by smtpav01.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 17 Oct 2025 14:49:24 +0000 (GMT) From: Christian Borntraeger To: balbirs@nvidia.com Cc: Liam.Howlett@oracle.com, airlied@gmail.com, akpm@linux-foundation.org, apopple@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, byungchul@sk.com, dakr@kernel.org, david@redhat.com, dev.jain@arm.com, dri-devel@lists.freedesktop.org, francois.dugast@intel.com, gourry@gourry.net, joshua.hahnjy@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, lyude@redhat.com, matthew.brost@intel.com, mpenttil@redhat.com, npache@redhat.com, osalvador@suse.de, rakie.kim@sk.com, rcampbell@nvidia.com, ryan.roberts@arm.com, simona@ffwll.ch, ying.huang@linux.alibaba.com, ziy@nvidia.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-next@vger.kernel.org Subject: linux-next: KVM/s390x regression (was: [v7 03/16] mm/huge_memory: add device-private THP support to PMD operations) Date: Fri, 17 Oct 2025 16:49:24 +0200 Message-ID: <20251017144924.10034-1-borntraeger@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251001065707.920170-4-balbirs@nvidia.com> References: <20251001065707.920170-4-balbirs@nvidia.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: DfklAXPcfAtrNGM5jY-KNpF22Kob2KaG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDEyMDA4NCBTYWx0ZWRfXwJljw/lEqKWM D1hwuYVkDKLS/aDjhMhaRxdkXUSsyvHOYS97+v4q1edG+GxAcK4qeURdagJiI4mVK2s6N2IiAW+ HcUFjBszJ89TY2a8nhqnMOY2r9Z3+6/toRhinLlrnZKDkls6dnQVfAEy/mphOIHvkGfmruukvpI eh3FxlZBm66BejMBARNCpb2ZZU9PMje2quJEIdM0sotJ6Lbj+2EQjXV6LOsocpdP7nbV+JEub/Q zi1OsQ1dlXYfwTnKwlvoaj5KWRQdtidwWKDSBBb/l7q+Ydcv8NYUkQuzj9YJ9fvOgoB5RCWm2Xh hHWazhg6C7AUK0gqCe9jK8iyOw7VLAZGw85A5ldyo1xtx38HBNkzQd7K4fMOqEXoBf/r28hVYoL R+KqIHei+dJEDX1+JlW0IYYc8R3Oqg== X-Proofpoint-GUID: FMxTvdFdAsHpeQIzVN6T6lFv6ZTA0cpa X-Authority-Analysis: v=2.4 cv=af5sXBot c=1 sm=1 tr=0 ts=68f2577c cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=axXWKVb_3fx9jgWgKzgA:9 a=nl4s5V0KI7Kw-pW0DWrs:22 a=pHzHmUro8NiASowvMSCR:22 a=xoEH_sTeL_Rfw54TyV31:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-17_05,2025-10-13_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 priorityscore=1501 spamscore=0 adultscore=0 suspectscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510120084 This patch triggers a regression for s390x kvm as qemu guests can no longer start error: kvm run failed Cannot allocate memory PSW=mask 0000000180000000 addr 000000007fd00600 R00=0000000000000000 R01=0000000000000000 R02=0000000000000000 R03=0000000000000000 R04=0000000000000000 R05=0000000000000000 R06=0000000000000000 R07=0000000000000000 R08=0000000000000000 R09=0000000000000000 R10=0000000000000000 R11=0000000000000000 R12=0000000000000000 R13=0000000000000000 R14=0000000000000000 R15=0000000000000000 C00=00000000000000e0 C01=0000000000000000 C02=0000000000000000 C03=0000000000000000 C04=0000000000000000 C05=0000000000000000 C06=0000000000000000 C07=0000000000000000 C08=0000000000000000 C09=0000000000000000 C10=0000000000000000 C11=0000000000000000 C12=0000000000000000 C13=0000000000000000 C14=00000000c2000000 C15=0000000000000000 KVM on s390x does not use THP so far, will investigate. Does anyone have a quick idea? Christian Borntraeger