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Wed, 10 Nov 2021 20:33:25 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Wed, 10 Nov 2021 20:33:25 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 4958) id ADC5CE02AB; Wed, 10 Nov 2021 21:33:24 +0100 (CET) From: Eric Farman To: Christian Borntraeger , Janosch Frank , David Hildenbrand , Claudio Imbrenda , Thomas Huth Cc: Heiko Carstens , Vasily Gorbik , kvm@vger.kernel.org, linux-s390@vger.kernel.org, Eric Farman Subject: [RFC PATCH v3 1/2] Capability/IOCTL/Documentation Date: Wed, 10 Nov 2021 21:33:21 +0100 Message-Id: <20211110203322.1374925-2-farman@linux.ibm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211110203322.1374925-1-farman@linux.ibm.com> References: <20211110203322.1374925-1-farman@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: NJq-VoJ4mbGpxesJh5AvfLcdiCCM51LP X-Proofpoint-ORIG-GUID: 9OzQsZVcmfvZlKbgnZPZB_VsxzV435mo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-10_13,2021-11-08_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 phishscore=0 malwarescore=0 clxscore=1015 mlxscore=0 priorityscore=1501 spamscore=0 adultscore=0 suspectscore=0 impostorscore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111100098 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org (This should be squashed with the next patch; it's just broken out for ease-of-future rebase.) Signed-off-by: Eric Farman --- Documentation/virt/kvm/api.rst | 39 ++++++++++++++++++++++++++++++++++ include/uapi/linux/kvm.h | 5 +++++ 2 files changed, 44 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index a6729c8cf063..c1d0cae51f03 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -5317,6 +5317,30 @@ the trailing ``'\0'``, is indicated by ``name_size`` in the header. The Stats Data block contains an array of 64-bit values in the same order as the descriptors in Descriptors block. +4.134 KVM_S390_VCPU_RESET_SIGP_BUSY +----------------------------------- + +:Capability: KVM_CAP_S390_USER_SIGP_BUSY +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: none +:Returns: 0 + +This ioctl resets the VCPU's indicator that it is busy processing a SIGP +order, and is thus available for additional SIGP orders. + +4.135 KVM_S390_VCPU_SET_SIGP_BUSY +--------------------------------- + +:Capability: KVM_CAP_S390_USER_SIGP_BUSY +:Architectures: s390 +:Type: vcpu ioctl +:Parameters: none +:Returns: 0, or -EBUSY if VCPU is already busy + +This ioctl sets the VCPU's indicator that it is busy processing a SIGP +order, and is thus unavailable for additional SIGP orders. + 5. The kvm_run structure ======================== @@ -6706,6 +6730,21 @@ MAP_SHARED mmap will result in an -EINVAL return. When enabled the VMM may make use of the ``KVM_ARM_MTE_COPY_TAGS`` ioctl to perform a bulk copy of tags to/from the guest. +7.29 KVM_CAP_S390_USER_SIGP_BUSY +-------------------------------- + +:Architectures: s390 +:Parameters: none + +This capability indicates that KVM should indicate when a SIGP order has been +sent to userspace for a particular vcpu, and return CC2 (BUSY) to any further +SIGP order directed at the same vcpu even for those orders that are handled +within the kernel. + +This capability is dependent on KVM_CAP_S390_USER_SIGP. If this capability +is not enabled, SIGP orders handled by the kernel may not indicate whether a +vcpu is currently processing another SIGP order. + 8. Other capabilities. ====================== diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index a067410ebea5..a00d5e226137 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1112,6 +1112,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_BINARY_STATS_FD 203 #define KVM_CAP_EXIT_ON_EMULATION_FAILURE 204 #define KVM_CAP_ARM_MTE 205 +#define KVM_CAP_S390_USER_SIGP_BUSY 206 #ifdef KVM_CAP_IRQ_ROUTING @@ -2007,4 +2008,8 @@ struct kvm_stats_desc { #define KVM_GET_STATS_FD _IO(KVMIO, 0xce) +/* Available with KVM_CAP_S390_USER_SIGP_BUSY */ +#define KVM_S390_VCPU_RESET_SIGP_BUSY _IO(KVMIO, 0xcf) +#define KVM_S390_VCPU_SET_SIGP_BUSY _IO(KVMIO, 0xd0) + #endif /* __LINUX_KVM_H */