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Thu, 21 May 2026 13:05:34 +0000 (GMT) Received: from p-imbrenda.aag-de.ibm.com (unknown [9.52.223.175]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 21 May 2026 13:05:33 +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, pbonzini@redhat.com, seanjc@google.com, yan.y.zhao@intel.com, isaku.yamahata@intel.com Subject: [PATCH v2 0/5] KVM: s390: Implement KVM_PRE_FAULT_MEMORY Date: Thu, 21 May 2026 15:05:28 +0200 Message-ID: <20260521130533.156491-1-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.54.0 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-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: 7qv8vNSzxmqMV5uJMcHrr7-a_9_HecEr X-Authority-Analysis: v=2.4 cv=GYMnWwXL c=1 sm=1 tr=0 ts=6a0f0325 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=WwTxizZw8kVH9eZwR8QA:9 X-Proofpoint-ORIG-GUID: CFnWpwBOo1FQJS5YlwRGqxhwHX4esIWC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTIxMDEyNiBTYWx0ZWRfX1PM7Tg5Dg9bw //RPHwWqAykHwOFpgtX4WFE0PHTc6P54lHUGUoEX9dI45dLePCRD4t3zKgDGKsnqel/wjdawV+h IQojFZ44C5zdtVzeqg/D424OFAJkD5p7JrjUSMImQ4o/abLt0lBDksElVb/K8Lj+iSCsIJGRDD/ wbmlDNgUY6hug3lfVkd7mpG/DQgXPDK4wT3Dnllw+mR3tzm1SZyd4jYiNg3TnN+jR9I+EtwYFwC xV98LrZ0fsapXZ+Kz1l2b+argdNOuVBMELa/6x+Bf5jNVN26ng2PocxFDiBkiraJD2yynR3LTp5 iNcl9gERlOPrvURLJsuXe9vD/umpU6JRmdvsYCxIF3Vwl+jC3euHBIlKKmvKAW6GHG9iN1ukPFW QIoC2UWcElo6M7rL6Gb5A0OA/1d8VjEX6JEtvjXugNGmcgUUzoZuhi7AoZgZCA0SEhugjXiDDsp W/Bhu6D4arI2IJ5T92Q== 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=2026-05-21_02,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 adultscore=0 suspectscore=0 spamscore=0 clxscore=1015 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605210126 Implement KVM_PRE_FAULT_MEMORY on s390, and update documentation and selftests accordingly. Faulted-in pages will be marked as accessed, unlike x86, otherwise they will trigger a minor fault when accessed. Avoiding such faults is one of the points of KVM_PRE_FAULT_MEMORY. CCing x86 people due to changes in the documentation and the selftests v1->v2: * Add the crste_region3 flag in struct guest_fault to keep track of the page size used to solve a fault. * Rewrite the s390 version of kvm_arch_vcpu_pre_fault_memory() so it looks and behaves similarly to the x86 version. No more loops, better handling of hugepage mappings, and more correct error handling. * Remove the assertion vcpu->run->exit_reason == KVM_EXIT_IO from the selftest, as it is redundant and x86-specific. Claudio Imbrenda (5): KVM: s390: Track page size in struct guest_fault KVM: s390: Implement KVM_PRE_FAULT_MEMORY KVM: s390: Update KVM_PRE_FAULT_MEMORY API documentation KVM: selftests: Fix pre_fault_memory_test to run on s390 KVM: selftests: Enable pre_fault_memory_test for s390 Documentation/virt/kvm/api.rst | 5 ++- arch/s390/kvm/Kconfig | 1 + arch/s390/kvm/dat.h | 1 + arch/s390/kvm/gmap.c | 2 + arch/s390/kvm/kvm-s390.c | 45 +++++++++++++++++++ tools/testing/selftests/kvm/Makefile.kvm | 1 + .../selftests/kvm/pre_fault_memory_test.c | 7 +-- 7 files changed, 54 insertions(+), 8 deletions(-) -- 2.54.0