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Wed, 18 Mar 2026 14:08:54 +0000 (GMT) From: Claudio Imbrenda To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, nsg@linux.ibm.com, nrb@linux.ibm.com, seiden@linux.ibm.com, gra@linux.ibm.com, schlameuss@linux.ibm.com, hca@linux.ibm.com, david@kernel.org Subject: [PATCH v1 2/7] KVM: s390: vsie: Fix check for pre-existing shadow mapping Date: Wed, 18 Mar 2026 15:08:48 +0100 Message-ID: <20260318140853.119460-3-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260318140853.119460-1-imbrenda@linux.ibm.com> References: <20260318140853.119460-1-imbrenda@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 5aWCSu0ELHsr7hwv1EOuS0kFju8fmEej X-Proofpoint-GUID: 5aWCSu0ELHsr7hwv1EOuS0kFju8fmEej X-Authority-Analysis: v=2.4 cv=KYnfcAYD c=1 sm=1 tr=0 ts=69bab1fc cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=PlgCcmkuhnOIsHVkaVAA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzE4MDExNiBTYWx0ZWRfX0q3sleTijXUL PC/AGhSwQIcraI369H7nYIbguZ5xmSY18J6054MDvv7xxroqc10a6RW33N3ENtmMNoSgs7hJrcv K5VMK13ttywAg55BNzZdSBhYFJqsawGq5GLV2Hk0fn1omDj2Wa/Me6fLR9ViEeDxgNbwB/u0k3r BePC46saZz+ntf/aHulq/jexj99s+o3/pGwuK+5HbbTWMIUUJGMet56PGTo3hWfIQ2lj1bhknTz 21RAW+sgxK47bNhfIQK5O7AKD2ovqdvTpi/HY94qAuP27CcadTW7957XDivpdFre0EGTr5Nek3s cpOqlapTNUbxq2WryO1dqEkTp3Cjtt3LpqcjHzWKEwPyEM7UpBaTOqERHmj47lJODUzGu0crwx1 uzV5QGU9p77KEcUybXMDd0trj7wLYFEo2OTvRb6IUj45erGP+a5NDZIUs6xM4Z6RzluPLc7W+sY 1z8f/FahcE2nATbdJ1Q== 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=2026-03-18_01,2026-03-17_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 spamscore=0 impostorscore=0 malwarescore=0 adultscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603180116 Content-Type: text/plain; charset="utf-8" When shadowing a nested guest, a check is performed and no shadowing is attempted if the nested guest is already shadowed. The existing check was incomplete; fix it by also checking whether the leaf DAT table entry in the existing shadow gmap has the same protection as the one specified in the guest DAT entry. Signed-off-by: Claudio Imbrenda Fixes: e38c884df921 ("KVM: s390: Switch to new gmap") --- arch/s390/kvm/gaccess.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index e490ae87db44..f5ffb11c8ef9 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -1505,7 +1505,8 @@ static int _gaccess_do_shadow(struct kvm_s390_mmu_cac= he *mc, struct gmap *sg, return rc; =20 /* A race occourred. The shadow mapping is already valid, nothing to do */ - if ((ptep && !ptep->h.i) || (!ptep && crste_leaf(*table))) + if ((ptep && !ptep->h.i && ptep->h.p =3D=3D w->p) || + (!ptep && crste_leaf(*table) && !table->h.i && table->h.p =3D=3D w->p= )) return 0; =20 gl =3D get_level(table, ptep); --=20 2.53.0