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Wed, 12 Oct 2022 16:21:14 +0000 (GMT) Received: from li-c6ac47cc-293c-11b2-a85c-d421c8e4747b.ibm.com.com (unknown [9.171.34.168]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 12 Oct 2022 16:21:14 +0000 (GMT) From: Pierre Morel To: qemu-s390x@nongnu.org Cc: qemu-devel@nongnu.org, borntraeger@de.ibm.com, pasic@linux.ibm.com, richard.henderson@linaro.org, david@redhat.com, thuth@redhat.com, cohuck@redhat.com, mst@redhat.com, pbonzini@redhat.com, kvm@vger.kernel.org, ehabkost@redhat.com, marcel.apfelbaum@gmail.com, eblake@redhat.com, armbru@redhat.com, seiden@linux.ibm.com, nrb@linux.ibm.com, frankja@linux.ibm.com, berrange@redhat.com, clg@kaod.org Subject: [PATCH v10 3/9] s390x/cpu_topology: resetting the Topology-Change-Report Date: Wed, 12 Oct 2022 18:21:01 +0200 Message-Id: <20221012162107.91734-4-pmorel@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221012162107.91734-1-pmorel@linux.ibm.com> References: <20221012162107.91734-1-pmorel@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: IqHR4wq_UZhnxF4T9IYsZJmVjEXoK1gd X-Proofpoint-GUID: PlYKC5XIrCOQ6mzeDSb7LIbFJYA6EiA3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-12_07,2022-10-12_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 malwarescore=0 spamscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 phishscore=0 impostorscore=0 mlxscore=0 mlxlogscore=999 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210120106 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org During a subsystem reset the Topology-Change-Report is cleared by the machine. Let's ask KVM to clear the Modified Topology Change Report (MTCR) bit of the SCA in the case of a subsystem reset. Signed-off-by: Pierre Morel Reviewed-by: Nico Boehr Reviewed-by: Janis Schoetterl-Glausch --- target/s390x/cpu.h | 1 + target/s390x/kvm/kvm_s390x.h | 1 + hw/s390x/cpu-topology.c | 12 ++++++++++++ hw/s390x/s390-virtio-ccw.c | 1 + target/s390x/cpu-sysemu.c | 7 +++++++ target/s390x/kvm/kvm.c | 23 +++++++++++++++++++++++ 6 files changed, 45 insertions(+) diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index d604aa9c78..9b35795ac8 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -825,6 +825,7 @@ void s390_enable_css_support(S390CPU *cpu); void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg); int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, int vq, bool assign); +void s390_cpu_topology_reset(void); #ifndef CONFIG_USER_ONLY unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu); #else diff --git a/target/s390x/kvm/kvm_s390x.h b/target/s390x/kvm/kvm_s390x.h index aaae8570de..a13c8fb9a3 100644 --- a/target/s390x/kvm/kvm_s390x.h +++ b/target/s390x/kvm/kvm_s390x.h @@ -46,5 +46,6 @@ void kvm_s390_crypto_reset(void); void kvm_s390_restart_interrupt(S390CPU *cpu); void kvm_s390_stop_interrupt(S390CPU *cpu); void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info); +int kvm_s390_topology_set_mtcr(uint64_t attr); #endif /* KVM_S390X_H */ diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c index c73cebfe6f..9f202621d0 100644 --- a/hw/s390x/cpu-topology.c +++ b/hw/s390x/cpu-topology.c @@ -107,6 +107,17 @@ static void s390_topology_realize(DeviceState *dev, Error **errp) qemu_mutex_init(&topo->topo_mutex); } +/** + * s390_topology_reset: + * @dev: the device + * + * Calls the sysemu topology reset + */ +static void s390_topology_reset(DeviceState *dev) +{ + s390_cpu_topology_reset(); +} + /** * topology_class_init: * @oc: Object class @@ -120,6 +131,7 @@ static void topology_class_init(ObjectClass *oc, void *data) dc->realize = s390_topology_realize; set_bit(DEVICE_CATEGORY_MISC, dc->categories); + dc->reset = s390_topology_reset; } static const TypeInfo cpu_topology_info = { diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index aa99a62e42..362378454a 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -113,6 +113,7 @@ static const char *const reset_dev_types[] = { "s390-flic", "diag288", TYPE_S390_PCI_HOST_BRIDGE, + TYPE_S390_CPU_TOPOLOGY, }; static void subsystem_reset(void) diff --git a/target/s390x/cpu-sysemu.c b/target/s390x/cpu-sysemu.c index 948e4bd3e0..707c0b658c 100644 --- a/target/s390x/cpu-sysemu.c +++ b/target/s390x/cpu-sysemu.c @@ -306,3 +306,10 @@ void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg) kvm_s390_set_diag318(cs, arg.host_ulong); } } + +void s390_cpu_topology_reset(void) +{ + if (kvm_enabled()) { + kvm_s390_topology_set_mtcr(0); + } +} diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index f96630440b..9c994d27d5 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -2585,3 +2585,26 @@ int kvm_s390_get_zpci_op(void) { return cap_zpci_op; } + +int kvm_s390_topology_set_mtcr(uint64_t attr) +{ + struct kvm_device_attr attribute = { + .group = KVM_S390_VM_CPU_TOPOLOGY, + .attr = attr, + }; + int ret; + + if (!s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY)) { + return -EFAULT; + } + if (!kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_TOPOLOGY, attr)) { + return -ENOENT; + } + + ret = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attribute); + if (ret) { + error_report("Failed to set cpu topology attribute %lu: %s", + attr, strerror(-ret)); + } + return ret; +} -- 2.31.1