1 /* 2 * KVM-based ITS implementation for a GICv3-based system 3 * 4 * Copyright (c) 2015 Samsung Electronics Co., Ltd. 5 * Written by Pavel Fedin <p.fedin@samsung.com> 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "qapi/error.h" 23 #include "hw/intc/arm_gicv3_its_common.h" 24 #include "sysemu/sysemu.h" 25 #include "sysemu/kvm.h" 26 #include "kvm_arm.h" 27 #include "migration/blocker.h" 28 29 #define TYPE_KVM_ARM_ITS "arm-its-kvm" 30 #define KVM_ARM_ITS(obj) OBJECT_CHECK(GICv3ITSState, (obj), TYPE_KVM_ARM_ITS) 31 32 static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid) 33 { 34 struct kvm_msi msi; 35 36 if (unlikely(!s->translater_gpa_known)) { 37 MemoryRegion *mr = &s->iomem_its_translation; 38 MemoryRegionSection mrs; 39 40 mrs = memory_region_find(mr, 0, 1); 41 memory_region_unref(mrs.mr); 42 s->gits_translater_gpa = mrs.offset_within_address_space + 0x40; 43 s->translater_gpa_known = true; 44 } 45 46 msi.address_lo = extract64(s->gits_translater_gpa, 0, 32); 47 msi.address_hi = extract64(s->gits_translater_gpa, 32, 32); 48 msi.data = le32_to_cpu(value); 49 msi.flags = KVM_MSI_VALID_DEVID; 50 msi.devid = devid; 51 memset(msi.pad, 0, sizeof(msi.pad)); 52 53 return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi); 54 } 55 56 static void kvm_arm_its_realize(DeviceState *dev, Error **errp) 57 { 58 GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev); 59 Error *local_err = NULL; 60 61 /* 62 * Block migration of a KVM GICv3 ITS device: the API for saving and 63 * restoring the state in the kernel is not yet available 64 */ 65 error_setg(&s->migration_blocker, "vITS migration is not implemented"); 66 migrate_add_blocker(s->migration_blocker, &local_err); 67 if (local_err) { 68 error_propagate(errp, local_err); 69 error_free(s->migration_blocker); 70 return; 71 } 72 73 s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false); 74 if (s->dev_fd < 0) { 75 error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS"); 76 return; 77 } 78 79 /* explicit init of the ITS */ 80 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 81 KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true); 82 83 /* register the base address */ 84 kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR, 85 KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd); 86 87 gicv3_its_init_mmio(s, NULL); 88 89 kvm_msi_use_devid = true; 90 kvm_gsi_direct_mapping = false; 91 kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled(); 92 } 93 94 static void kvm_arm_its_init(Object *obj) 95 { 96 GICv3ITSState *s = KVM_ARM_ITS(obj); 97 98 object_property_add_link(obj, "parent-gicv3", 99 "kvm-arm-gicv3", (Object **)&s->gicv3, 100 object_property_allow_set_link, 101 OBJ_PROP_LINK_UNREF_ON_RELEASE, 102 &error_abort); 103 } 104 105 static void kvm_arm_its_class_init(ObjectClass *klass, void *data) 106 { 107 DeviceClass *dc = DEVICE_CLASS(klass); 108 GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass); 109 110 dc->realize = kvm_arm_its_realize; 111 icc->send_msi = kvm_its_send_msi; 112 } 113 114 static const TypeInfo kvm_arm_its_info = { 115 .name = TYPE_KVM_ARM_ITS, 116 .parent = TYPE_ARM_GICV3_ITS_COMMON, 117 .instance_size = sizeof(GICv3ITSState), 118 .instance_init = kvm_arm_its_init, 119 .class_init = kvm_arm_its_class_init, 120 }; 121 122 static void kvm_arm_its_register_types(void) 123 { 124 type_register_static(&kvm_arm_its_info); 125 } 126 127 type_init(kvm_arm_its_register_types) 128