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Tue, 13 Oct 2026 14:42:26 +0000 (GMT) Received: from t83lp65.lnxne.boe (unknown [9.87.84.240]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Tue, 13 Oct 2026 14:42:26 +0000 (GMT) From: Gautam Gala To: borntraeger@linux.ibm.com, frankja@linux.ibm.com, imbrenda@linux.ibm.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: david@kernel.org, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, pbonzini@redhat.com, seanjc@google.com, shuah@kernel.org Subject: [PATCH 0/2] KVM: s390: fix ESSA addressing exception injection in migration mode Date: Tue, 13 Oct 2026 16:42:23 +0200 Message-ID: <20261013144225.8885-1-ggala@linux.ibm.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: kvm@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-Authority-Analysis: v=2.4 cv=Cr0q4X4D c=1 sm=1 tr=0 ts=6ace4357 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=OLYqng0F8Bf9Jdo386UA:9 X-Proofpoint-GUID: KHikQuOI6SO5TP6TvSSg8tNq6dw79Zto X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEzMDA1NiBTYWx0ZWRfX8MtkDzvjbtuO srtlmR/pUh9E2CBeNYCDJKD/BOVR2tr5NIi5nRMc22gaUxIjcED1K9o20NIkeQxJv8jTQYP2gjO RCNGszfk3otFao9LFL/XDzUrH+zyrc4v7WT7tTudZOCdFVyK0fE/uP/6tIB6HAmg2NevAmta3S8 AA7eZ+pdzRX/vlNhA4YAncpwYC1hMkjnHUGyfBR6LW94gVA1TwDvRUtEkug3elwwfzy0mqylzk5 +CI1l1MBKAsdbPYzX5BV20NXjBionj/e8Pi62xs2zKr6UXyXn4De4FXvsXsAnn/HlYcxNP9bTMs pxlYaFAPtIiVbIGTX6GYQVYpIeJ0dnBNJLlFuTdx4nTB4wn7vDjguUHEkHOMZZYRaZ3CiM6waOc h8HBZsrs+hINm8TeirULnTBjDuZFKf6HtImzZ1evzYNmBYy++fDMJFwmdDSn7d9uxz3PLFEzXo1 1F5bw6zClsBo111AHxA== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEzMDA1NiBTYWx0ZWRfX3+peAP7Q9v/6 tfqvFBdyfE+8QYv4pLN7pBTWcoTjOqKacrZi/nmjdwW7+9SV5GUOaPBtXHNLQH6iTqa6Qj81ayf b3INHntHrMX4p21qJ+zu83Zn4352uQY= X-Proofpoint-ORIG-GUID: XwPoNiH0iyWSN6mnJBxa_3GZ_MceteqB X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-13_01,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 adultscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 clxscore=1011 impostorscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610130056 ESSA emulation in migration mode silently dropped addressing exceptions when the guest page-table walk failed, so the guest never received the expected PGM_ADDRESSING interrupt during live migration. Patch 1 fixes dat_perform_essa() to return -PGM_ADDRESSING on a walk failure, and __do_essa() to inject the program interrupt for that return value. Patch 2 adds a regression test integrated into the existing cmma_test selftest. Gautam Gala (2): KVM: s390: fix ESSA addressing exception injection in migration mode KVM: s390: selftests: add ESSA migration mode PGM_ADDRESSING regression test arch/s390/kvm/gmap/dat.c | 5 +- arch/s390/kvm/s390/priv.c | 4 +- tools/testing/selftests/kvm/s390/cmma_test.c | 79 ++++++++++++++++++++ 3 files changed, 86 insertions(+), 2 deletions(-) -- 2.55.0