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Wed, 1 Apr 2026 15:12:24 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 4958) id 91A75E068C; Wed, 01 Apr 2026 17:12:24 +0200 (CEST) From: Eric Farman To: Christian Borntraeger , Hendrik Brueckner , Janosch Frank , Claudio Imbrenda , David Hildenbrand Cc: Paolo Bonzini , Jonathan Corbet , Shuah Khan , kvm@vger.kernel.org, linux-s390@vger.kernel.org, Eric Farman Subject: [PATCH v2 4/4] KVM: s390: Add KVM capability for ESA mode guests Date: Wed, 1 Apr 2026 17:12:21 +0200 Message-ID: <20260401151221.2272408-5-farman@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260401151221.2272408-1-farman@linux.ibm.com> References: <20260401151221.2272408-1-farman@linux.ibm.com> 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-Authority-Analysis: v=2.4 cv=RsjI7SmK c=1 sm=1 tr=0 ts=69cd35dd cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=ZXKDrtGt6P313FoxNToA:9 X-Proofpoint-GUID: bZKD5kGx9kGiP4safMM9FUd-b7NXaOUa X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAxMDEzOCBTYWx0ZWRfX50/zkCyc21Uu E7GjZKM2qtduT990BZcNbNPtR5yJpFtcvrJ1ZHIwIFEbAW6dqBXBwZ9A5P3Z9qWoSMlFqozIHqL n75HGYBH0un4ux0oaTuijR5gB0B/VcOJnUA7d5idRM5mkaVcOsHxsMF0z9ViwREQbingVoOsX3o M6FU9WHQc5u8k+FkP0zMZBulmEU0A8mvejI5PRh25JTyzaQUZdZZA/dJxC1CU7svcJ9x7bZ607o KmBUSj5N/bnoLwviJnOLxno0ROVCmSR6LPS7R7/UINTdtRFG75TXcoZfowrfyhKPoRLHeDWYF9I A0ho2IywZxB8yyniMM8FlMVOlZX+39+32hUbnG8UZp65BHf+FmQNv51QNmFL8HS82ARSVDUpelt psXptGh1N/DJAVcsuRKrg+faeDbcuwvEeM5hStu7NCq8v1GQPSZ/pmVOHNcuBF1tmdowQhIvdr4 uODNUDZrGQ/Yso2C4JQ== X-Proofpoint-ORIG-GUID: bZKD5kGx9kGiP4safMM9FUd-b7NXaOUa 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=2026-04-01_04,2026-04-01_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 malwarescore=0 spamscore=0 clxscore=1015 phishscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604010138 From: Hendrik Brueckner Now that all the bits are properly addressed, provide a mechanism for testing ESA mode guests in nested configurations. Signed-off-by: Hendrik Brueckner [farman@us.ibm.com: Updated commit message] Reviewed-by: Janosch Frank Signed-off-by: Eric Farman --- Documentation/virt/kvm/api.rst | 8 ++++++++ arch/s390/kvm/kvm-s390.c | 6 ++++++ include/uapi/linux/kvm.h | 1 + 3 files changed, 15 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.= rst index 032516783e96..feabfee0f714 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -9436,6 +9436,14 @@ KVM exits with the register state of either the L1= or L2 guest depending on which executed at the time of an exit. Userspace must take care to differentiate between these cases. =20 +8.47 KVM_CAP_S390_VSIE_ESAMODE +------------------------------ + +:Architectures: s390 + +The presence of this capability indicates that the nested KVM guest can +start in ESA mode. + 9. Known KVM API problems =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D =20 diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index d7838334a338..3856af54b6fe 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -629,6 +629,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, lon= g ext) case KVM_CAP_IRQFD_RESAMPLE: case KVM_CAP_S390_USER_OPEREXEC: case KVM_CAP_S390_KEYOP: + case KVM_CAP_S390_VSIE_ESAMODE: r =3D 1; break; case KVM_CAP_SET_GUEST_DEBUG2: @@ -926,6 +927,11 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct = kvm_enable_cap *cap) icpt_operexc_on_all_vcpus(kvm); r =3D 0; break; + case KVM_CAP_S390_VSIE_ESAMODE: + VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_VSIE_ESAMODE"); + kvm->arch.allow_vsie_esamode =3D 1; + r =3D 0; + break; default: r =3D -EINVAL; break; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 80364d4dbebb..9710184d883d 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -989,6 +989,7 @@ struct kvm_enable_cap { #define KVM_CAP_ARM_SEA_TO_USER 245 #define KVM_CAP_S390_USER_OPEREXEC 246 #define KVM_CAP_S390_KEYOP 247 +#define KVM_CAP_S390_VSIE_ESAMODE 248 =20 struct kvm_irq_routing_irqchip { __u32 irqchip; --=20 2.51.0