From: Christian Borntraeger <borntraeger@linux.ibm.com>
To: David Hildenbrand <david@redhat.com>, 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
Subject: Re: linux-next: KVM/s390x regression
Date: Fri, 17 Oct 2025 17:01:39 +0200 [thread overview]
Message-ID: <c67386be-5278-411d-97e7-43fc34bf7c98@linux.ibm.com> (raw)
In-Reply-To: <9beff9d6-47c7-4a65-b320-43efd1e12687@redhat.com>
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?
next prev parent reply other threads:[~2025-10-17 15:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20251001065707.920170-4-balbirs@nvidia.com>
2025-10-17 14:49 ` linux-next: KVM/s390x regression (was: [v7 03/16] mm/huge_memory: add device-private THP support to PMD operations) Christian Borntraeger
2025-10-17 14:54 ` linux-next: KVM/s390x regression David Hildenbrand
2025-10-17 15:01 ` Christian Borntraeger [this message]
2025-10-17 15:07 ` David Hildenbrand
2025-10-17 15:20 ` Christian Borntraeger
2025-10-17 17:07 ` David Hildenbrand
2025-10-17 21:56 ` Balbir Singh
2025-10-17 22:15 ` David Hildenbrand
2025-10-17 22:41 ` David Hildenbrand
2025-10-20 7:01 ` Christian Borntraeger
2025-10-20 7:00 ` Christian Borntraeger
2025-10-20 8:41 ` David Hildenbrand
2025-10-20 9:04 ` Claudio Imbrenda
2025-10-27 16:47 ` Claudio Imbrenda
2025-10-27 16:59 ` David Hildenbrand
2025-10-27 17:06 ` Christian Borntraeger
2025-10-28 9:24 ` Balbir Singh
2025-10-28 13:01 ` [PATCH v1 0/1] KVM: s390: Fix missing present bit for gmap puds Claudio Imbrenda
2025-10-28 13:01 ` [PATCH v1 1/1] " Claudio Imbrenda
2025-10-28 21:23 ` Balbir Singh
2025-10-29 10:00 ` David Hildenbrand
2025-10-29 10:20 ` Claudio Imbrenda
2025-10-28 22:53 ` [PATCH v1 0/1] " Andrew Morton
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