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Mon, 25 Aug 2025 15:18:31 +0000 (GMT) From: Claudio Imbrenda To: linux-kernel@vger.kernel.org Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, david@redhat.com, frankja@linux.ibm.com, seiden@linux.ibm.com, nsg@linux.ibm.com, nrb@linux.ibm.com, schlameuss@linux.ibm.com, hca@linux.ibm.com, mhartmay@linux.ibm.com, borntraeger@de.ibm.com Subject: [PATCH v3 0/2] KVM: s390: Fix two bugs Date: Mon, 25 Aug 2025 17:18:29 +0200 Message-ID: <20250825151831.78221-1-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.51.0 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-Spam-Details-Enc: AW1haW4tMjUwODIzMDAyMSBTYWx0ZWRfX46rnXuQhXDpK 7ILnHtI47S4ML32P10dGebA/bFc8CG/x6nJ7IUyyghNQB2a2btWGue6LDVvxBhHlPovUJ1FTlNC Z0PCwc2uzumJySTTmjlMFZSTv4tBMNjpC/vAtKO8gp6Q+NwsYGmzUGk+4A0t4W6nErA8+Cgm21A KszzfKPy94hMCSUmBY5DXfNk6k+W7rV2kqKILJX2vB2XEAZ631Usl4ENuy5Tpt61+iRyi86hSp0 QPSaXW3vgl+6Azmc/F5PUDsgT+Isj0+LZsBx620mJIWpEx2PcbOw5hnOYRl6KTGMc3mhjtO+s9+ I8ziOiDcyYTTyX+KKAo5AncCyzZo1pCbjrZA4w/B2x3cEcRJIwCApsVoJjc19T5MbDRK7p2HRfh +H7CsQIB X-Proofpoint-ORIG-GUID: eJOxZD5UMf-DVICznofI6FY1Y5E5vohR X-Proofpoint-GUID: eJOxZD5UMf-DVICznofI6FY1Y5E5vohR X-Authority-Analysis: v=2.4 cv=Ndbm13D4 c=1 sm=1 tr=0 ts=68ac7ecd cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=2OwXVqhp2XgA:10 a=cAp4uq1tgFU3EhW9v_kA:9 a=zZCYzV9kfG8A:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-25_07,2025-08-20_03,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 clxscore=1015 phishscore=0 malwarescore=0 suspectscore=0 bulkscore=0 spamscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508230021 This small series fixes two bugs in s390 KVM. One is small and trivial, the other is pretty bad. * The wrong type of flag was being passed to vcpu_dat_fault_handler(); it expects a FOLL_* flag, but a FAULT_FLAG_* was passed instead. * Due to incorrect usage of mmu_notifier_register(), in some rare cases when running a secure guest, the struct mm for the userspace process would get freed too early and cause a use-after-free. v2->v3 * Make sure .ops is not NULL before calling mmu_notifier_register() to avoid NULL pointer errors (thanks Marc) v1->v2 * Rename the parameters of __kvm_s390_handle_dat_fault() and vcpu_dat_fault_handler() from flags to foll (thanks Christian) Claudio Imbrenda (2): KVM: s390: Fix incorrect usage of mmu_notifier_register() KVM: s390: Fix FOLL_*/FAULT_FLAG_* confusion arch/s390/kvm/kvm-s390.c | 24 ++++++++++++------------ arch/s390/kvm/pv.c | 16 +++++++++++----- 2 files changed, 23 insertions(+), 17 deletions(-) -- 2.51.0