linux-kernel - Re: [PATCH v5 22/23] KVM: s390: Enable 1M pages for gmap

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Message-ID: <da705f02-9f8f-4a4c-96c6-b507c88f92b8@de.ibm.com>
Date: Mon, 24 Nov 2025 18:35:53 +0100
From: Christian Borntraeger <borntraeger@...ibm.com>
To: Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        frankja@...ux.ibm.com, nsg@...ux.ibm.com, nrb@...ux.ibm.com,
        seiden@...ux.ibm.com, gra@...ux.ibm.com, schlameuss@...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 v5 22/23] KVM: s390: Enable 1M pages for gmap

Am 24.11.25 um 12:55 schrieb Claudio Imbrenda:
[...]

> @@ -5837,11 +5838,6 @@ static int __init kvm_s390_init(void)
>   		return -ENODEV;
>   	}
>   
> -	if (nested && hpage) {
> -		pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n");
> -		return -EINVAL;
> -	}
> -
Yay. As a followup (when things have settled) we should set either set the default of hpage
to 1 or even remove the hpage kernel parameter alltogether.