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Wed, 27 May 2026 14:43:58 +0000 (GMT) Received: from p-imbrenda.aag-de.ibm.com (unknown [9.52.223.175]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 27 May 2026 14:43:58 +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 v3 0/5] KVM: s390: Implement KVM_PRE_FAULT_MEMORY Date: Wed, 27 May 2026 16:43:53 +0200 Message-ID: <20260527144358.186359-1-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-s390@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-Spam-Details-Enc: AW1haW4tMjYwNTI3MDE0NCBTYWx0ZWRfX724cHuPCjyCI tsY33qpuX6hXghzD+8Y8ejACOHRygEpGZ77OXw4CLStP0xM0v1eJB1HUg9WlrJcYEqD52n46BcE gyCRlxjMcQIpjRfFLFZii+jjkeumydg5NF7QFSYWT7XtjlLkAgg2HguN91lvy3X9lLUaYhBx7/t 3x7L5V3bm3gBuDelpR/a425699tURxHqKc8UEJ9bPzbf6FvoU8XEOEM6U3kxII+wrGUZieWWptB uMEAIPXahqozDarzJ9SSKZKja7cDYOzZZ+yYRUVBUzKdCLFZ1bnWmO1EqVdDUaBCObRJZHX+pxa Pb+E1q0J8k6MreYDFu/HWC07PUv2ugZJ5eiMCGBAcXgjG6xfGHjIrlsb+tjvwhuvUqN42QJ5St+ nanjBiQzOxDzGjU5wZq2AqjTe1SHahoeq+gAPhywxz6p/YLazDiHjJngnAS1A2F1eVYL17i//z1 A/oo8yuGJezKGkO8HsQ== X-Authority-Analysis: v=2.4 cv=KItqylFo c=1 sm=1 tr=0 ts=6a170336 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=8YE8oK4BZoqmkRg4UKQA:9 X-Proofpoint-ORIG-GUID: -TclanOx1RCbsmd6UjOfEcNroFyhbIUg X-Proofpoint-GUID: 9p5aEL6YN2Rke9yJvW0z6L2RwtIrgdUO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-05-27_02,2026-05-26_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 priorityscore=1501 clxscore=1015 adultscore=0 suspectscore=0 bulkscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605270144 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. This series depends on some kvm/s390 functions that are slightly buggy at the moment. Those functions are being fixed in a separate series. Even without those fixes, this series is not buggy, it's just a bit inefficient in some corner cases. CCing x86 people due to changes in the documentation and the selftests just for completeness, since the selftest has been acked already. v2->v3: * Fix typos * Correctly indicate page size in gmap_handle_minor_crste_fault() also in case nothing needed to be done. * Pick up and acked-by 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