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Mon, 22 Dec 2025 16:50:41 +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, svens@linux.ibm.com, agordeev@linux.ibm.com, gor@linux.ibm.com, david@redhat.com, gerald.schaefer@linux.ibm.com Subject: [PATCH v6 06/28] KVM: s390: Introduce import_lock Date: Mon, 22 Dec 2025 17:50:11 +0100 Message-ID: <20251222165033.162329-7-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251222165033.162329-1-imbrenda@linux.ibm.com> References: <20251222165033.162329-1-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-Authority-Analysis: v=2.4 cv=G8YR0tk5 c=1 sm=1 tr=0 ts=694976e7 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=ukBcN2NOhkw1kEjOR7IA:9 X-Proofpoint-ORIG-GUID: tawjs8rIpNfPuimSNT2LbofBU_SmuI3P X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjIyMDE1NCBTYWx0ZWRfX09KcxDK/nkMm 3OFlZKvHdNT3IwBpi6AA6L/sZLinO+CVksxRjH4gXZo2AtkOwgIqW0ageyj4PqIDSVgOtqG9oc+ 1oiZWQSPol/ZMzzpv4AJtBhan0rYoGYZXH5IVdk1mqvGjchAH4Z5ZQeYFAL0vHMPAvvkFjpGV5q LFVoh4gW9zKN5BEXP1msSi5OHGtTZSmQkbpK1aHpimGS3jD9Cv2KCoOiR9xZyhOWfzphsO0+w0p mdOmZIY7uOwLVxquVVlJRUc+cCCLlRN16Q4Zc0vTKNDtWsBr3HIPRa8acbmLzN6L6vjahO4ABWz l1KTIi3T56nx119DPNadPcxiK8uTTyUKUCpE5Va3TVLQgyATRuGEJRTtEe/GeAAnr2+Am5jc2QZ NdMKMoWwy7HdiU7+xlaJvi3dJjqwyTZhFBQu0gaUksC8XTh/V4VNK9ifEi+/+9MTqVVVqFr0+5Z 62vEx82q0YsH3MJkivg== X-Proofpoint-GUID: tawjs8rIpNfPuimSNT2LbofBU_SmuI3P X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-22_02,2025-12-22_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 clxscore=1015 adultscore=0 spamscore=0 malwarescore=0 impostorscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2512220154 Content-Type: text/plain; charset="utf-8" Introduce import_lock to avoid future races when converting pages to secure. Signed-off-by: Claudio Imbrenda --- arch/s390/include/asm/kvm_host.h | 2 ++ arch/s390/kvm/kvm-s390.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_h= ost.h index ae1223264d3c..3dbddb7c60a9 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -630,6 +630,8 @@ struct kvm_s390_pv { void *set_aside; struct list_head need_cleanup; struct mmu_notifier mmu_notifier; + /* Protects against concurrent import-like operations */ + struct mutex import_lock; }; =20 struct kvm_arch { diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 56a50524b3ee..cd39b2f099ca 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -3330,6 +3330,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long t= ype) char debug_name[16]; int i, rc; =20 + mutex_init(&kvm->arch.pv.import_lock); + rc =3D -EINVAL; #ifdef CONFIG_KVM_S390_UCONTROL if (type & ~KVM_VM_S390_UCONTROL) --=20 2.52.0