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[2003:d8:2f0c:c200:fa4a:c4ff:1b32:21ce]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47114428dbfsm85439735e9.5.2025.10.17.08.07.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Oct 2025 08:07:54 -0700 (PDT) Message-ID: <8c778cd0-5608-4852-9840-4d98828d7b33@redhat.com> Date: Fri, 17 Oct 2025 17:07:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: linux-next: KVM/s390x regression To: Christian Borntraeger , 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, 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 References: <20251001065707.920170-4-balbirs@nvidia.com> <20251017144924.10034-1-borntraeger@linux.ibm.com> <9beff9d6-47c7-4a65-b320-43efd1e12687@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: D7EFB140008 X-Rspamd-Server: rspam02 X-Stat-Signature: k7buoufaeq37za1gah74kx1x5goosk5p X-HE-Tag: 1760713678-410963 X-HE-Meta: U2FsdGVkX19yMh5Vi4HbK9LDICK7woy5I7H3JViwmWPC7rYco0mdPz+Be4QlIhQS4FC90GtXuf5a3AhEbcLHM9H9RwCidXG7XtIq3KmThv0sOy80yiQVIlP7+8EzMe8vkDplJ2bm03n5cPmyjaGKlTYx9zCurt0Jx8Im9ghLeBedVdER19j/n+aL2U1ZgYWE9Yi/KZY9oxEN01Rd1C6wF/prRkL0++buCmf3Hq+tZj8lbCiCz2YMUsL+kG6jqpJN7YDdPy0b0zxHdzXS+UWnQH37yJV2K6WC+PzuE1fUDDPS1V5jes+RqGaBMFbbgaG276iMjDFigK+VjKZJeLhQ6r2FkkleREfZlGFZ0pCmAt25QvjMmd7Aexuvhhzq6C7oEHDe9oyZXOlQLJXef6EZtvaxCBiU9bMwBUuDROqdKXLPyesROZGM+YUZKKI6PoCw78njcRz+gVDjSg7SGqCunTrsgOgEiecsCb/GCbiMJdMCHlW2Ekd+Q6tQaS7anB/rfJd/tENuaxbvg6cx3fPQGI9KRJdVC6QQ2QJTDGIJj/p46k7/p0EXzPF+FrerfSQR3/Lb2DDqNZLr/Qo9gQs7+qQm+SeX5q0ZFMHyZGYbGSQ9QaKNsuMZP5oRZ6KTSifV5xCKiQQ+Yp3iTRPSpHKjgnJgBVqn3K2ZA3n1YCMkiuUZlAcgMLjREZL+gNKdYk5cwwDvohFKHAg4LHvBiIJ72vbFXBw/FbttLaNZGzjouMTq2+78UhEJ3wsB1fDMrCBJVDWai3qk6we2WHH+nw31yOemkY+naIncLbip22XQkjahS4xr4RK2XIR2Ht0LeKgCfh7BwKha1pZSg9o/GZxaKpeCaru28kfjYLvHT2rjeeU0KNWQG4qi5TAKAllYYZK7k9Rx/mMQnp5cAY9LRjbX2AXWiEZk1rTT0kSinB+bGQQQrZJ+t4X3np2uHbKduFk8PsfhdymclPHix8dZzJR JsDnb/sK PrNIR9OgcvvzmeqeMOT6XDmpMD5s2B25Q7WE9s0NQZY6QYH6yZIkSEfx8iI+4TpDKgzTaybmCvhHFiCrBDEwmuQFTmSeD9O3MQuxeHzdisQ3g0ogHQN53ftxBjA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 17.10.25 17:01, Christian Borntraeger wrote: > Am 17.10.25 um 16:54 schrieb David Hildenbrand: >> On 17.10.25 16:49, Christian Borntraeger wrote: >>> 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? >> >> Only when running KVM guests and apart from that everything else seems to be fine? > > We have other weirdness in linux-next but in different areas. Could that somehow be > related to use disabling THP for the kvm address space? Not sure ... it's a bit weird. I mean, when KVM disables THPs we essentially just remap everything to be mapped by PTEs. So there shouldn't be any PMDs in that whole process. Remapping a file THP (shmem) implies zapping the THP completely. I assume in your kernel config has CONFIG_ZONE_DEVICE and CONFIG_ARCH_ENABLE_THP_MIGRATION set, right? I'd rule out copy_huge_pmd(), zap_huge_pmd() a well. What happens if you revert the change in mm/pgtable-generic.c? But the whole -ENOMEM error is a weird symptom. -- Cheers David / dhildenb