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Mon, 9 Feb 2026 17:16:12 +0000 (GMT) Date: Mon, 9 Feb 2026 18:16:10 +0100 From: Claudio Imbrenda To: Steffen Eiden Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Christian Borntraeger , Janosch Frank , Andreas Grapentin , Hendrik Brueckner Subject: Re: [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB Message-ID: <20260209181610.550b8ff0@p-imbrenda> In-Reply-To: <20260209152925.578872-1-seiden@linux.ibm.com> References: <20260209152925.578872-1-seiden@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 4.3.1 (GTK 3.24.49; x86_64-redhat-linux-gnu) 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-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjA5MDE0MSBTYWx0ZWRfXyVgTMZVWs59l mKJk0mGhiuKhtd9ZSk+7XREZUJVsmJsmMbIpBLAEb9pjxq0mFZ6oXjnRgTE3iuwa9NO6gGkO6bw t43Rk9ZOSvcuCccm8BJLlXsdxu9X0AOkglVFmji6rXigKV7YbDHSTGyeqqdw8CaB15ZRcXn9s4O CT/O2QAoHYWdZr+tD6VszA7kYTcQOyCKN48HgYNZKBGVHbVLXI8bq3yOLne/aNGjXJzSQKMMc3Z tN47vv/+bQHNG5XcFo6sIiboeaTF7/tHGRb4AVVN0TWUcwHih231JTHcahIduPYm4Yt0/qqIaql yOCHGLTNDlVCbztC3XQc//eLI46e1SsM/HbjPOXB+PiwMMjIJzc0daoWlTucOYgZ4pXO/NEWuz7 2ssYRnvELEIup/F0lJc86vkAVpLPBUE0cfIY3EdOZU0lqNIe392JUW+hmYAi3ylzRjSK3GDq6gP S3awOmY9Lme/q21yvLw== X-Proofpoint-ORIG-GUID: -bdRg4JV-HfEOiun5W4b7CfV-1t40n8v X-Proofpoint-GUID: -bdRg4JV-HfEOiun5W4b7CfV-1t40n8v X-Authority-Analysis: v=2.4 cv=O+Y0fR9W c=1 sm=1 tr=0 ts=698a1661 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=yz80Hj2ai0dgsENxVL4A:9 a=CjuIK1q_8ugA:10 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=2026-02-09_01,2026-02-09_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 adultscore=0 malwarescore=0 impostorscore=0 bulkscore=0 clxscore=1015 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602090141 On Mon, 9 Feb 2026 16:29:25 +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 Reviewed-by: Claudio Imbrenda > --- > 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;