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Wed, 4 Feb 2026 15:03:01 +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@kernel.org, gerald.schaefer@linux.ibm.com Subject: [PATCH v7 06/29] KVM: s390: Introduce import_lock Date: Wed, 4 Feb 2026 16:02:35 +0100 Message-ID: <20260204150259.60425-7-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260204150259.60425-1-imbrenda@linux.ibm.com> References: <20260204150259.60425-1-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-Spam-Details-Enc: AW1haW4tMjYwMjA0MDExMyBTYWx0ZWRfX8xAwTD2nPO+5 RXunBXovkNX9LpSoBeQB8iiS/yxM7SC1RoeNKodBBE1QjbYe5HoDDgE9XXVdnGiEcf+8ogEUiDs YvasaGBF3CMzNEmNLQSuMKm+j+Vy/vx4wpfS+9vorguSZNPUWhysnUR/I6/DwWOkEG50gbyLZgh /CVx5xvLjTD/Vio4zPTAP87UEIwBg4FTMj+Q9335rjf3syXq4BatWQOElC65AKBOxmqZWXfdQOH zidKL8qa6fjmHY1TR92HA+SBVTBlKUK9SoYaJ/1WDvLjioFqlDHXGMpeganaaEKsZdMxwa49QnO NF4jMOv9gkW5DGMd/Nc12uYtzoZgtL+UiQwMzlWtrsS7k2w1VX7AmVmoefZr13ycCCZnjCEhBvX iDySWUzK7wpxAz4u14F7omOTZ75JenQrGq9iMYGWTz3lhEUW2SwM0pm+M//eCPqQQqIY+NgNFu3 X2c+gjlWTu/fM7mhjUg== X-Proofpoint-GUID: CkTnNpl9gYGbYk7wOXVeDTjwIFd9nvoo X-Authority-Analysis: v=2.4 cv=DbAaa/tW c=1 sm=1 tr=0 ts=69835fab cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=ukBcN2NOhkw1kEjOR7IA:9 X-Proofpoint-ORIG-GUID: CkTnNpl9gYGbYk7wOXVeDTjwIFd9nvoo 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=2026-02-04_04,2026-02-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 adultscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 suspectscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2602040113 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