From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 49AF41B0439; Tue, 10 Feb 2026 14:07:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770732469; cv=none; b=ilQt61DAeZ4yQuARVEMiSs9yLnhAadQZMAItQCWzGdnFcLNWdFGAEPcQN44VLd9m4cq7frXmsMu8XXR/uZ6tDRG3PFXXvZDPsIDeZQDWDi9LTTz9qmMyO2Gb1cKpIJICrRDKELy1xN6CZe8zmAdW0CMjzpWvdDAwTyU2vMhOHWM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770732469; c=relaxed/simple; bh=F8iuOjkyX7jHZzstiyL4Uhmt4AwUVMu6fTe4EIdjJG4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=k0EDgf35z/G26odJUcs9iPl3SOWA2aXDgMfWx3uTbcNXXpQssnj4xz+4CNBOQdom+Q2j0Afvhj6PkZTmJjwtr24KE9J6zLeBt0EA1TeRC47sNqTAf+BXP9Qt9LyMA69STG7GZ3E1q1pPbuhScPSikI6piHbnB0KE99aQ5vMQyMA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=EKeKlmjU; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="EKeKlmjU" Received: from pps.filterd (m0353725.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 61A9aOOJ205004; Tue, 10 Feb 2026 14:07:47 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-type:date:from:in-reply-to:message-id:mime-version :references:sender:subject:to; s=pp1; bh=Yc60JAGw94y/yuGFA4Xnxdl WAI3EoSHMi0uznrK6hdc=; b=EKeKlmjUPtNV5mrhxr6LuM3C0WPnWbkcdECq9g/ BJ6oZxudY+4o/58vqQl81MFD6U3rIhal7l/xb390P3bFrofBGpzpIy0GYbaP7fO3 jFi7qSPTfwcKjyPa5VHi/+c3AsiLu53tMDjfjf/4jguSC7DIkM/KDg/IRckdW28f zCZeUowiiLTDFDYF67hI6Sc7Uo/43MG63BnUNWj8IItPND/fHizqFhKRz835yTJl KoP3fJjEIOhdIDkgNsGeu7Guge+MnyLvb9BZaLYqZXKnGoLGznh4ncA7p/SAHhGl 0F4FFAGB44oFlzomPnbqwPBtAh3KsDOJXIEUgCREi3TamqA== Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4c696v2cq3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 10 Feb 2026 14:07:46 +0000 (GMT) Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 61ABYT9s019258; Tue, 10 Feb 2026 14:07:46 GMT Received: from smtprelay01.fra02v.mail.ibm.com ([9.218.2.227]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 4c6hxk1cye-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 10 Feb 2026 14:07:46 +0000 Received: from smtpav07.fra02v.mail.ibm.com (smtpav07.fra02v.mail.ibm.com [10.20.54.106]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 61AE7gpC61669866 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 10 Feb 2026 14:07:42 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 775822004B; Tue, 10 Feb 2026 14:07:42 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5EE7720043; Tue, 10 Feb 2026 14:07:42 +0000 (GMT) Received: from vela (unknown [9.111.81.59]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTPS; Tue, 10 Feb 2026 14:07:42 +0000 (GMT) Received: from brueckner by vela with local (Exim 4.99.1) (envelope-from ) id 1vpoOz-00000000EIn-3VBs; Tue, 10 Feb 2026 15:07:41 +0100 Date: Tue, 10 Feb 2026 15:07:41 +0100 From: Hendrik Brueckner To: Steffen Eiden Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Andreas Grapentin , Hendrik Brueckner Subject: Re: [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB Message-ID: References: <20260209152925.578872-1-seiden@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260209152925.578872-1-seiden@linux.ibm.com> Sender: Hendrik Brueckner X-TM-AS-GCONF: 00 X-Proofpoint-GUID: SvxLixL66tTjFGzIUw25Nzy1jdS-SOYb X-Proofpoint-ORIG-GUID: SvxLixL66tTjFGzIUw25Nzy1jdS-SOYb X-Authority-Analysis: v=2.4 cv=JdWxbEKV c=1 sm=1 tr=0 ts=698b3bb2 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=kj9zAlcOel0A:10 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=VnNF1IyMAAAA:8 a=ycHnYxuuFyCDzNjIPycA:9 a=CjuIK1q_8ugA:10 a=ZXulRonScM0A:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjEwMDExNiBTYWx0ZWRfX7C5TJzEF5I7k znJ3OArLcznuxQOPT0fjR23K4obggAfJ1vktrsoZwiSXtLHgjjr5QRfZvlAd4Wbjp5gFVaTuotr XfPN3WjOdYTWwFApDZSUMtwh6a//TilJ9Dbo/tP97t3FX1WctETFhnqA/oBxLCfrl1SJH57K65A og+QbYEWU/htZuRLstq/jX5WRJImmgAPRwXZUTs9gOmntg2gQRxCKxCXR5OgAQi56phR/iKKGEO P1OznwYVkbqAPlO0bShFoEm2UHr4s9HScgPIC18ZCZEieWTI3IJcaCrMnqjsUZTZWnWHjpiCdr+ BBJNREuuPYUW+7lz4R4rGRixMVRgK2pnw8FonSQjyRvwsx4PdZDBQzz3DBeURtUhjEkUvY5TgIj SURCnxA9K3MybrQ2EVrJM05haCKMBasMWR1VxR2k3yrRalqROZ06awzdS1UeiohfBXY6XZ4LQ8H w02eaVYuev/eGtZzU4Q== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-10_01,2026-02-10_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1011 impostorscore=0 bulkscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602100116 On Mon, Feb 09, 2026 at 04:29:25PM +0100, Steffen Eiden wrote: > Relax the maximum allowed Secure Execution (SE) header size from > 8 KiB to 1 MiB. This allows individual secure guest images to run on a > wider range of physical machines. > > Signed-off-by: Steffen Eiden > --- > arch/s390/kvm/kvm-s390.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > index 56a50524b3ee..3428a8d427b2 100644 > --- a/arch/s390/kvm/kvm-s390.c > +++ b/arch/s390/kvm/kvm-s390.c > @@ -2744,9 +2744,9 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) > if (copy_from_user(&parms, argp, sizeof(parms))) > break; > > - /* Currently restricted to 8KB */ > + /* Currently restricted to 1MiB */ > r = -EINVAL; > - if (parms.length > PAGE_SIZE * 2) > + if (parms.length > SZ_1M) > break; > > r = -ENOMEM; Reviewed-by: Hendrik Brueckner