linux-kernel - Re: [PATCH v3 04/23] KVM: s390: Add gmap_helper_set

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Message-Id: <DE6I2KA0FPCX.IKTZXU74CPDX@linux.ibm.com>
Date: Wed, 12 Nov 2025 07:25:08 +0100
From: "Christoph Schlameuss" <schlameuss@...ux.ibm.com>
To: "Claudio Imbrenda" <imbrenda@...ux.ibm.com>, <kvm@...r.kernel.org>
Cc: <linux-kernel@...r.kernel.org>, <linux-s390@...r.kernel.org>,
        <borntraeger@...ibm.com>, <frankja@...ux.ibm.com>, <nsg@...ux.ibm.com>,
        <nrb@...ux.ibm.com>, <seiden@...ux.ibm.com>, <hca@...ux.ibm.com>,
        <svens@...ux.ibm.com>, <agordeev@...ux.ibm.com>, <gor@...ux.ibm.com>,
        <david@...hat.com>, <gerald.schaefer@...ux.ibm.com>
Subject: Re: [PATCH v3 04/23] KVM: s390: Add gmap_helper_set_unused()

On Thu Nov 6, 2025 at 5:10 PM CET, Claudio Imbrenda wrote:
> Add gmap_helper_set_unused() to mark userspace ptes as unused.
>
> Core mm code will use that information to discard unused pages instead
> of attempting to swap them.
>
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> Reviewed-by: Nico Boehr <nrb@...ux.ibm.com>
> Tested-by: Nico Boehr <nrb@...ux.ibm.com>

Acked-by: Christoph Schlameuss <schlameuss@...ux.ibm.com>

> ---
>  arch/s390/include/asm/gmap_helpers.h |  1 +
>  arch/s390/mm/gmap_helpers.c          | 79 ++++++++++++++++++++++++++++
>  2 files changed, 80 insertions(+)