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Tue, 5 May 2026 20:45:23 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 4958) id 12A90E069B; Tue, 05 May 2026 22:45:23 +0200 (CEST) From: Eric Farman To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , David Hildenbrand Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, Eric Farman Subject: [PATCH] KVM: s390: Toggle operation exception for userspace Date: Tue, 5 May 2026 22:45:21 +0200 Message-ID: <20260505204521.1658704-1-farman@linux.ibm.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA1MDIwMCBTYWx0ZWRfX4m70vA6LmF/s J2hb1VsZXdLtOxjqw6n0Zy36f/IVlVpvCnKt+ygzTfLm1y7y/o8eZpkiC3sFTrnJq/X42dNdHbz PqFdqHPRgcVBTk5JZ6yKE2/Kw+I2rxIogO64MCub3NgQ2ynX4FiUf47Vm5/VdYHyGorvBwbuIRe EQ4MQUDuNbzzIkHh6d/JJhywDl/0HMUPTp4+OcUR2/5mSp62On0ZzpqC7i9IkcFWVtovqwOqJ9w WaOcDxUGNAb/wbY2tSrebz0UYB5rJtfREpNKc0p1e/02K2xnBaXxSOQsdUmb9Dh3CFxstODrFvJ hAc3yIYP37Nl8+cipwStAArHywSIdvar+bkYRkzCykOYAERMrSr6BTPLx/yGE3NdVY1PwYiWIcJ pS3S7uIU7vlABJuWh0MjaaFuz0pTxMJ7l43KUa8xJrUk8NcxvNottw5b4EiikcULD0k2EaBJVnF KoB+iogP8I6VbMzlzvA== X-Proofpoint-ORIG-GUID: PHdM-PhnVcymXSs9NyVuPTCsxm8_lFcO X-Proofpoint-GUID: PHdM-PhnVcymXSs9NyVuPTCsxm8_lFcO X-Authority-Analysis: v=2.4 cv=W7UIkxWk c=1 sm=1 tr=0 ts=69fa56e8 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=ea8k8XiQOFGV3AjeF4IA:9 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=2026-05-05_02,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 spamscore=0 clxscore=1015 phishscore=0 bulkscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605050200 The KVM_CAP_S390_USER_OPEREXEC capability allows operation exceptions to be forwarded to userspace. But the actual enablement at the hardware level occurs in kvm_arch_vcpu_postcreate(), and only if STFLE.74 or user_instr0 are enabled. The latter is associated with a separate capability (KVM_CAP_S390_USER_INSTR0), so the only way this happens for the USER_OPEREXEC capability is if STFLE.74 is enabled. KVM unconditionally enables this bit in kvm_arch_init_vm(), but the guest could disable it from the CPU model and thus ignore this capability. Add USER_OPEREXEC to the check in kvm_arch_vcpu_postcreate(), such that either capability would enable this type of exception. Fixes: 8e8678e740ec ("KVM: s390: Add capability that forwards operation e= xceptions") Signed-off-by: Eric Farman --- arch/s390/kvm/kvm-s390.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index e09960c2e6ed..a91a42174302 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -3521,7 +3521,8 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu= ) vcpu->arch.gmap =3D vcpu->kvm->arch.gmap; sca_add_vcpu(vcpu); } - if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0) + if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0 || + vcpu->kvm->arch.user_operexec) vcpu->arch.sie_block->ictl |=3D ICTL_OPEREXC; } =20 --=20 2.51.0