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Tue, 7 Apr 2026 12:30:13 +0000 (GMT) Date: Tue, 7 Apr 2026 14:30:12 +0200 From: Steffen Eiden To: Claudio Imbrenda Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, nrb@linux.ibm.com, schlameuss@linux.ibm.com, gra@linux.ibm.com, david@kernel.org Subject: Re: [PATCH v3 2/6] KVM: s390: Add alignment checks for hugepages Message-ID: <20260407123012.296205-B-seiden@linux.ibm.com> References: <20260402150135.196943-1-imbrenda@linux.ibm.com> <20260402150135.196943-3-imbrenda@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@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: <20260402150135.196943-3-imbrenda@linux.ibm.com> X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=KeridwYD c=1 sm=1 tr=0 ts=69d4f8da cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=IOgtwTkHqvAa2c77OGcA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-ORIG-GUID: h2MP0EUOrypcm--nW8ayEudu4M-CWPeJ X-Proofpoint-GUID: h2MP0EUOrypcm--nW8ayEudu4M-CWPeJ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA3MDExNSBTYWx0ZWRfX1YfSRDDQeVAQ mzCZSkED78HMFvhBHAQ+hUPhZRB9i6V8VOsiIpuxnAcRmThKG2CJmZl1Ox0EUyiU1LbPcQBsJ11 vg051WVYI5URpIdis3IJwyvSio80N8BVkLxZRniM6ijFz+d2S4MFu2FRhK/Ectfx0rGJg7iwY7S kdbcIb3Jye0J0R6skVaMBDyVTqFc8W2xy5/7F42q2DqoKstW5+9ngGW0+2TDFMnz2NhEJYiDMJH N3VAUQ47KY0f7Uui38SM7GNSy5v38Igvso5nf1jKHvusQId7Jrm0grinc9LOv8Dd5ZU8l9AIrHr oKFhW8uAsU9mqPqP2fW6xBkjl0TxbNGJ8asadIpc+OJdb2pLV9/AFK94JvJZhBXWRU28qD5q3H7 pZimAaqLWa1m8/KD02wOiP2OvLohq7HRoKegr4YxkyN8tWl/oQB908W2SV2vAXrHnQyojj0eJQt 1ORANPsaagypHpfF91A== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-07_02,2026-04-07_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 clxscore=1015 phishscore=0 priorityscore=1501 spamscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604070115 On Thu, Apr 02, 2026 at 05:01:31PM +0200, Claudio Imbrenda wrote: > When backing a guest page with a large page, check that the alignment > of the guest page matches the alignment of the host physical page > backing it within the large page. > > Also check that the memslot is large enough to fit the large page. > > Those checks are currently not needed, because memslots are guaranteed > to be 1m-aligned, but this will change. > > Signed-off-by: Claudio Imbrenda Reviewed-by: Steffen Eiden