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Mon, 23 Mar 2026 13:43:58 +0000 (GMT) Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 23 Mar 2026 14:43:53 +0100 Message-Id: Subject: Re: [PATCH v2 1/8] KVM: s390: vsie: Fix dat_split_ste() From: "Christoph Schlameuss" Cc: , , , , , , , , , To: "Claudio Imbrenda" , X-Mailer: aerc 0.21.0 References: <20260320161542.202913-1-imbrenda@linux.ibm.com> <20260320161542.202913-2-imbrenda@linux.ibm.com> In-Reply-To: <20260320161542.202913-2-imbrenda@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 0e-Su-VIdUAIXevdtnsTfrklmrCjZ8HJ X-Proofpoint-ORIG-GUID: 0e-Su-VIdUAIXevdtnsTfrklmrCjZ8HJ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzIzMDEwMyBTYWx0ZWRfXxJeAOu/QUS5R HAUzMQLsehdnIaXMXV673v0BxjMcQv/4TPZ3nQ9SguRJHREVD/KFquQsOOhBwD6ZZQ8vYqJAFLG Fuy1JN81iTHgFaGcsLj85bSzrCPnP2mXVBMzflL+h5emjAorLrmIQvKt1iCVj+emRV9bXMKqPJi jgEjis/JjOHSPs+QQwpyJ1Kb+HzPocYBLbXtkYee4MFGCeSml7cscuCb9GIpoJomZV2EUEfIz7d 9qa/WQ37OOVCcfoNnRw5Y+D9PQgO8otlnxQZax06LLN5em4PdEXqPpNP/eL/Uz6kYscmJYl42x3 D/jFimfz0Pp0biMGv0U8Md+iONEmmw9nbFui/Cum744dS91amaIaqZ1xbJPkACwPTp98cAf88O0 FZDKIjRkawWRydjZyGvBa6uC/IIo0IhF20c6CeqmfMnMQCIz2+BIM9gKYez1tHtDo7q0CKkvLPp 0vAZ3snPx/qypVibXMA== X-Authority-Analysis: v=2.4 cv=KbXfcAYD c=1 sm=1 tr=0 ts=69c143a3 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=buXqh26OFB9ADXD7E0MA:9 a=QEXdDO2ut3YA:10 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=2026-03-23_04,2026-03-20_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 malwarescore=0 adultscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603230103 On Fri Mar 20, 2026 at 5:15 PM CET, Claudio Imbrenda wrote: > If the guest misbehaves and puts the page tables for its nested guest > inside the memory of the nested guest itself, the shadow mapping will > lose synchronization with the actual mapping. > > Propagate the vsie_notif bit from shadowed large pages to smaller pages > when splitting a large page. > > Fixes: 2db149a0a6c5 ("KVM: s390: KVM page table management functions: wal= ks") > Signed-off-by: Claudio Imbrenda Reviewed-by: Christoph Schlameuss > --- > arch/s390/kvm/dat.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/s390/kvm/dat.c b/arch/s390/kvm/dat.c > index 670404d4fa44..48b5f2bcf172 100644 > --- a/arch/s390/kvm/dat.c > +++ b/arch/s390/kvm/dat.c > @@ -292,6 +292,7 @@ static int dat_split_ste(struct kvm_s390_mmu_cache *m= c, union pmd *pmdp, gfn_t g > pt->ptes[i].val =3D init.val | i * PAGE_SIZE; > /* No need to take locks as the page table is not installed yet. */ > pgste_init.prefix_notif =3D old.s.fc1.prefix_notif; > + pgste_init.vsie_notif =3D old.s.fc1.vsie_notif; > pgste_init.pcl =3D uses_skeys && init.h.i; > dat_init_pgstes(pt, pgste_init.val); > } else {