linux-kernel - Re: [PATCH] KVM: s390: Fix to clear PTE when discarding a swapped page

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Message-ID: <dfc83821-f2ff-4b9c-b9cf-9dda89e8eb77@redhat.com>
Date: Wed, 24 Sep 2025 14:22:05 +0200
From: David Hildenbrand <david@...hat.com>
To: Gautam Gala <ggala@...ux.ibm.com>,
 Alexander Gordeev <agordeev@...ux.ibm.com>,
 Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
 Christian Borntraeger <borntraeger@...ux.ibm.com>,
 Sven Schnelle <svens@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>,
 Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
 kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: s390: Fix to clear PTE when discarding a swapped
 page

On 24.09.25 14:17, Gautam Gala wrote:
> KVM run fails when guests with 'cmm' cpu feature and host are
> under memory pressure and use swap heavily. This is because
> npages becomes ENOMEN (out of memory) in hva_to_pfn_slow()
> which inturn propagates as EFAULT to qemu. Clearing the page
> table entry when discarding an address that maps to a swap
> entry resolves the issue.
> 
> Suggested-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> Signed-off-by: Gautam Gala <ggala@...ux.ibm.com>
> ---

Sounds bad,

I assume we want Fixes: and CC: stable, right?

-- 
Cheers

David / dhildenb