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Thu, 9 Jul 2026 13:54:05 +0000 (GMT) From: Matthew Rosato To: linux-s390@vger.kernel.org Cc: alifm@linux.ibm.com, farman@linux.ibm.com, borntraeger@linux.ibm.com, frankja@linux.ibm.com, imbrenda@linux.ibm.com, david@kernel.org, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, schnelle@linux.ibm.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] KVM: s390: pci: Fix handling of AIF enable without AISB Date: Thu, 9 Jul 2026 09:54:04 -0400 Message-ID: <20260709135404.2255136-1-mjrosato@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-Authority-Analysis: v=2.4 cv=Q/XiJY2a c=1 sm=1 tr=0 ts=6a4fa800 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=rbFSK_jk36QTBQMObJwA:9 X-Proofpoint-GUID: NhFBMyCD1wyjfu55y7Ayc5Z7iAQwlMmM X-Proofpoint-ORIG-GUID: NhFBMyCD1wyjfu55y7Ayc5Z7iAQwlMmM X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDEzNiBTYWx0ZWRfX2ByoNDUUmO7J aBD8MdU+BxMWMuYdI6yLdhcjuWWwJXc7mDuhgqYGGe92XOQwXxeFX3+P1C+b7MPAbMbS223RKnT hi0r6TTqEesjuq7lAKEalDGdyEoJ3/Q= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEzNiBTYWx0ZWRfX3i7GFpHGf/OM iDSng6t2vsr+obnfjamI0C2ANIwvbPfOWuA75DJ/fFPRaIDPSjrH7fREKpOgbrpsZReCLjCyrEF uxjJuRZWDvFMjhJZId2CMlAgRackoutVVSF6n6nYW226e2CVbehO/bEBpTmpRw3HYDqbzWaZ1Y7 L3PvMBCzurLPN+sd0cA86QArH4Ju7mulNMqXNYM7ix9n3/HU8Y9ao+JSLmSR61EeFvi19n/eN8T T2tqtdz7j+DSc/9/AiTzg7MnCxYIHvgJqhxTcISUaudl64+ombI+0O/n//HrRNsjFZI+N5HAwJH Xbyrm0igzpEFD+r+cYnmnqdKwNc5zru0q9i7/frDER+ndT31yAbc2udhNDC91nVbeBQsh1WyO0/ 4PYLV5/HH2JIJz4dpaC+rB/Fp+/XT5nFPZ8Ns1+cGBlMU9OC8kWrhqkL390FCrsYd9+8l5i+vhw RlgiBCHDY2hP2Y617dQ== 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=2026-07-09_02,2026-07-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 spamscore=0 phishscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 lowpriorityscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607090136 When a guest seeks to register IRQs without a summary bit specified, ensure that the associated GAITE then stores 0 for the guest AISB location instead of virt_to_phys(page_address(NULL)). Fixes: 3c5a1b6f0a18 ("KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding") Cc: stable@vger.kernel.org Reviewed-by: Farhan Ali Signed-off-by: Matthew Rosato --- arch/s390/kvm/pci.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c index 5b075c38998e..dc748cde4703 100644 --- a/arch/s390/kvm/pci.c +++ b/arch/s390/kvm/pci.c @@ -300,9 +300,14 @@ static int kvm_s390_pci_aif_enable(struct zpci_dev *zdev, struct zpci_fib *fib, gaite->gisc = fib->fmt0.isc; gaite->count++; - gaite->aisbo = fib->fmt0.aisbo; - gaite->aisb = virt_to_phys(page_address(aisb_page) + (fib->fmt0.aisb & - ~PAGE_MASK)); + if (fib->fmt0.sum == 1) { + gaite->aisbo = fib->fmt0.aisbo; + gaite->aisb = virt_to_phys(page_address(aisb_page) + + (fib->fmt0.aisb & ~PAGE_MASK)); + } else { + gaite->aisbo = 0; + gaite->aisb = 0; + } aift->kzdev[zdev->aisb] = zdev->kzdev; spin_unlock_irq(&aift->gait_lock); -- 2.54.0