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Tue, 28 Jul 2026 17:07:08 +0000 (GMT) Received: from p-imbrenda.ibmuc.com (unknown [9.111.73.241]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 28 Jul 2026 17:07:08 +0000 (GMT) From: Claudio Imbrenda To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, david@kernel.org, seiden@linux.ibm.com, nrb@linux.ibm.com, schlameuss@linux.ibm.com, gra@linux.ibm.com Subject: [PATCH v4 00/13] KVM: s390: Misc fixes Date: Tue, 28 Jul 2026 19:06:55 +0200 Message-ID: <20260728170708.294400-1-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Uhpi7ro2W9SxadMVv7PwHpfzbLsRpZoG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI4MDE0OSBTYWx0ZWRfX5XVosBIt35M1 7M7jTT5bOuCgTEC06Iy7niJm+G1FmG1b7DW8DXj77eznT41crR4GzpB5JVHRiqs0x2t/vy/d/88 /tBfXFvg8FUb7uwYz48KqKfqdCEi5T/lmDcHI5pNm0FxnKpMPgt0dSsHlFS3Yx3J2arLyJZWgDL ASfdx7HEkOgmI/Fv62tMajTxO5fu70YDPja+HzPKQWLia9Oyq8NjGSVWntIbe57hIsx8LaqXg5a 0BuPp4+tE65Wo9e52qo6s6qMlSSuM4F6L4P5hLiEGfyQ9wlg2ILbKp+8vJUys+inj20iH/tVPY7 ABGa/g7N2Ny9AkFmREOxj+BsWWa5gPV6/Cy2z9rjXR43kBq+7B3pIK98ja9CqmgUXgWjLjGpZMV omRMgErofsIJGISPq5Z0mL0zoMzDpwDOEMWwxzuveCSn0F+KrwpaeQjvbb1DKhBFUFl/Jjua4KA 8VSZf66BWYVGUEmpRZQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI4MDE0OSBTYWx0ZWRfXxlyAqJAvi/hX 6mhqn3qohQ7u1tHk/mK64qzz4wGu+ko1m+/ZKfukaUv5d+2x5MWTgDw3//jbqGeGBjzFu71NMwd 9YPjhKoCBsIS+WUT3SQVLs1iy8IzS1I= X-Authority-Analysis: v=2.4 cv=AZeB2XXG c=1 sm=1 tr=0 ts=6a68e1c5 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=aWu7778oA4-70mMxV74A:9 X-Proofpoint-GUID: Uhpi7ro2W9SxadMVv7PwHpfzbLsRpZoG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-28_04,2026-07-28_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 phishscore=0 adultscore=0 impostorscore=0 clxscore=1015 malwarescore=0 suspectscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607280149 Fix a bunch of small issues that came up during the previous round of fixes. They are mostly extremely unlikely races, but they should be fixed nonetheless. v3->v4 * Improve patch descriptions, add comments * Use smp_store_release and smp_load_acquire in the first patch * Multiple fixes in patch 4: potential NULL pointer dereference, incorrect behaviour in low memory condition * Rework patch 8 to use scope-based cleanup instead of gotos. * Three new patches: - KVM: s390: Fix kvm_arch_commit_memory_region() when low on memory - KVM: s390: Fix kvm_s390_vcpu_unsetup_cmma() - KVM: s390: Fix sca_clear_ext_call() for UCONTROL v2->v3 * Use READ_ONCE to pair with WRITE_ONCE in the first patch * Fix leaking PGM_ADDRESSING also in kvm_s390_keyop() and related functions * Fix and improve commit messages * Use slots_arch_lock instead of slots_lock for ESSA operations * Use normal spin_{,un}lock() functions instead of scoped_guard to avoid mixing the two styles * Use the newly introduced vcpu->arch.initialized to determine whether the SCA entry needs to be cleared * Improve handling of -EINTR; handle_mvpg_pei() needed some refactoring to deal with it properly * Three new patches: - Free the mmu cache when kvm_arch_vcpu_create() fails - Fix ordering when adding to SCA - Fix cleanup in kvm_s390_pv_create_cpu() v1->v2 * Drop some patches that have been picked upstream in the meantime. * Drop patch 3, as it was trying to fix a bug that does not exist * Avoid the NULL gmap dereference by using a flag * Fix the return value of kvm_s390_[gp]et_skeys too * Use kvm->slots_arch_lock instead of kvm->slots_lock for CMMA and ESSA handling, to avoid potential deadlocks with the RCU. * Three new patches to fix other issues that came out while fixing the other issues Claudio Imbrenda (13): KVM: s390: Fix unlikely NULL gmap dereference KVM: s390: Fix leaking of PGM_ADDRESSING to userspace KVM: s390: Fix race in __do_essa() KVM: s390: cmma: Fix dirty tracking when removing memslot KVM: s390: ucontrol: Add missing locking around gmap_remove_child() KVM: s390: Fix overclearing ESCA in case of error KVM: s390: Return -EINTR if a signal was pending while faulting-in KVM: s390: Free the mmu cache when kvm_arch_vcpu_create() fails KVM: s390: Fix ordering when adding to SCA KVM: s390: Fix cleanup in kvm_s390_pv_create_cpu() KVM: s390: Fix kvm_arch_commit_memory_region() when low on memory KVM: s390: Fix kvm_s390_vcpu_unsetup_cmma() KVM: s390: Fix sca_clear_ext_call() for UCONTROL arch/s390/include/asm/kvm_host.h | 1 + arch/s390/kvm/dat.c | 23 ++++-- arch/s390/kvm/dat.h | 2 +- arch/s390/kvm/faultin.c | 4 +- arch/s390/kvm/intercept.c | 23 +++--- arch/s390/kvm/interrupt.c | 7 +- arch/s390/kvm/kvm-s390.c | 121 +++++++++++++++++++------------ arch/s390/kvm/priv.c | 10 ++- arch/s390/kvm/pv.c | 43 +++++------ 9 files changed, 141 insertions(+), 93 deletions(-) -- 2.55.0