linux-kernel - Re: linux-next: KVM/s390x regression

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Message-ID: <9beff9d6-47c7-4a65-b320-43efd1e12687@redhat.com>
Date: Fri, 17 Oct 2025 16:54:09 +0200
From: David Hildenbrand <david@...hat.com>
To: Christian Borntraeger <borntraeger@...ux.ibm.com>, balbirs@...dia.com
Cc: Liam.Howlett@...cle.com, airlied@...il.com, akpm@...ux-foundation.org,
 apopple@...dia.com, baohua@...nel.org, baolin.wang@...ux.alibaba.com,
 byungchul@...com, dakr@...nel.org, dev.jain@....com,
 dri-devel@...ts.freedesktop.org, francois.dugast@...el.com,
 gourry@...rry.net, joshua.hahnjy@...il.com, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, lorenzo.stoakes@...cle.com, lyude@...hat.com,
 matthew.brost@...el.com, mpenttil@...hat.com, npache@...hat.com,
 osalvador@...e.de, rakie.kim@...com, rcampbell@...dia.com,
 ryan.roberts@....com, simona@...ll.ch, ying.huang@...ux.alibaba.com,
 ziy@...dia.com, kvm@...r.kernel.org, linux-s390@...r.kernel.org,
 linux-next@...r.kernel.org
Subject: Re: linux-next: KVM/s390x regression

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