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[2003:d8:2f0c:c200:fa4a:c4ff:1b32:21ce]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4711441f975sm87898455e9.4.2025.10.17.07.54.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Oct 2025 07:54:12 -0700 (PDT) Message-ID: <9beff9d6-47c7-4a65-b320-43efd1e12687@redhat.com> Date: Fri, 17 Oct 2025 16:54:09 +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> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 5B8CAC0008 X-Stat-Signature: ru787tx53xqupp7baybd3xhrx816qd6y X-Rspam-User: X-HE-Tag: 1760712856-573491 X-HE-Meta: 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 Ghea1C3T 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 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 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? That's weird :) -- Cheers David / dhildenb