1 /* 2 * Virtio MEM PCI device 3 * 4 * Copyright (C) 2020 Red Hat, Inc. 5 * 6 * Authors: 7 * David Hildenbrand <david@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. 10 * See the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "virtio-mem-pci.h" 15 #include "hw/mem/memory-device.h" 16 #include "qapi/error.h" 17 #include "qapi/qapi-events-machine.h" 18 #include "qapi/qapi-events-misc.h" 19 20 static void virtio_mem_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp) 21 { 22 VirtIOMEMPCI *mem_pci = VIRTIO_MEM_PCI(vpci_dev); 23 DeviceState *vdev = DEVICE(&mem_pci->vdev); 24 25 if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) { 26 vpci_dev->nvectors = 2; 27 } 28 29 virtio_pci_force_virtio_1(vpci_dev); 30 qdev_realize(vdev, BUS(&vpci_dev->bus), errp); 31 } 32 33 static void virtio_mem_pci_set_addr(MemoryDeviceState *md, uint64_t addr, 34 Error **errp) 35 { 36 object_property_set_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP, addr, errp); 37 } 38 39 static uint64_t virtio_mem_pci_get_addr(const MemoryDeviceState *md) 40 { 41 return object_property_get_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP, 42 &error_abort); 43 } 44 45 static MemoryRegion *virtio_mem_pci_get_memory_region(MemoryDeviceState *md, 46 Error **errp) 47 { 48 VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md); 49 VirtIOMEM *vmem = &pci_mem->vdev; 50 VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); 51 52 return vmc->get_memory_region(vmem, errp); 53 } 54 55 static void virtio_mem_pci_decide_memslots(MemoryDeviceState *md, 56 unsigned int limit) 57 { 58 VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md); 59 VirtIOMEM *vmem = VIRTIO_MEM(&pci_mem->vdev); 60 VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); 61 62 vmc->decide_memslots(vmem, limit); 63 } 64 65 static unsigned int virtio_mem_pci_get_memslots(MemoryDeviceState *md) 66 { 67 VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md); 68 VirtIOMEM *vmem = VIRTIO_MEM(&pci_mem->vdev); 69 VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); 70 71 return vmc->get_memslots(vmem); 72 } 73 74 static uint64_t virtio_mem_pci_get_plugged_size(const MemoryDeviceState *md, 75 Error **errp) 76 { 77 return object_property_get_uint(OBJECT(md), VIRTIO_MEM_SIZE_PROP, 78 errp); 79 } 80 81 static void virtio_mem_pci_fill_device_info(const MemoryDeviceState *md, 82 MemoryDeviceInfo *info) 83 { 84 VirtioMEMDeviceInfo *vi = g_new0(VirtioMEMDeviceInfo, 1); 85 VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md); 86 VirtIOMEM *vmem = &pci_mem->vdev; 87 VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem); 88 DeviceState *dev = DEVICE(md); 89 90 if (dev->id) { 91 vi->id = g_strdup(dev->id); 92 } 93 94 /* let the real device handle everything else */ 95 vpc->fill_device_info(vmem, vi); 96 97 info->u.virtio_mem.data = vi; 98 info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM; 99 } 100 101 static uint64_t virtio_mem_pci_get_min_alignment(const MemoryDeviceState *md) 102 { 103 return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP, 104 &error_abort); 105 } 106 107 static void virtio_mem_pci_size_change_notify(Notifier *notifier, void *data) 108 { 109 VirtIOMEMPCI *pci_mem = container_of(notifier, VirtIOMEMPCI, 110 size_change_notifier); 111 DeviceState *dev = DEVICE(pci_mem); 112 char *qom_path = object_get_canonical_path(OBJECT(dev)); 113 const uint64_t * const size_p = data; 114 115 qapi_event_send_memory_device_size_change(dev->id, *size_p, qom_path); 116 g_free(qom_path); 117 } 118 119 static void virtio_mem_pci_unplug_request_check(VirtIOMDPCI *vmd, Error **errp) 120 { 121 VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(vmd); 122 VirtIOMEM *vmem = &pci_mem->vdev; 123 VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem); 124 125 vpc->unplug_request_check(vmem, errp); 126 } 127 128 static void virtio_mem_pci_get_requested_size(Object *obj, Visitor *v, 129 const char *name, void *opaque, 130 Error **errp) 131 { 132 VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(obj); 133 134 object_property_get(OBJECT(&pci_mem->vdev), name, v, errp); 135 } 136 137 static void virtio_mem_pci_set_requested_size(Object *obj, Visitor *v, 138 const char *name, void *opaque, 139 Error **errp) 140 { 141 VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(obj); 142 DeviceState *dev = DEVICE(obj); 143 144 /* 145 * If we passed virtio_mem_pci_unplug_request_check(), making sure that 146 * the requested size is 0, don't allow modifying the requested size 147 * anymore, otherwise the VM might end up hotplugging memory before 148 * handling the unplug request. 149 */ 150 if (dev->pending_deleted_event) { 151 error_setg(errp, "'%s' cannot be changed if the device is in the" 152 " process of unplug", name); 153 return; 154 } 155 156 object_property_set(OBJECT(&pci_mem->vdev), name, v, errp); 157 } 158 159 static const Property virtio_mem_pci_class_properties[] = { 160 DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, 161 VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), 162 DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 163 DEV_NVECTORS_UNSPECIFIED), 164 }; 165 166 static void virtio_mem_pci_class_init(ObjectClass *klass, const void *data) 167 { 168 DeviceClass *dc = DEVICE_CLASS(klass); 169 VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass); 170 PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass); 171 MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass); 172 VirtIOMDPCIClass *vmdc = VIRTIO_MD_PCI_CLASS(klass); 173 174 k->realize = virtio_mem_pci_realize; 175 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 176 pcidev_k->revision = VIRTIO_PCI_ABI_VERSION; 177 pcidev_k->class_id = PCI_CLASS_OTHERS; 178 device_class_set_props(dc, virtio_mem_pci_class_properties); 179 180 mdc->get_addr = virtio_mem_pci_get_addr; 181 mdc->set_addr = virtio_mem_pci_set_addr; 182 mdc->get_plugged_size = virtio_mem_pci_get_plugged_size; 183 mdc->get_memory_region = virtio_mem_pci_get_memory_region; 184 mdc->decide_memslots = virtio_mem_pci_decide_memslots; 185 mdc->get_memslots = virtio_mem_pci_get_memslots; 186 mdc->fill_device_info = virtio_mem_pci_fill_device_info; 187 mdc->get_min_alignment = virtio_mem_pci_get_min_alignment; 188 189 vmdc->unplug_request_check = virtio_mem_pci_unplug_request_check; 190 } 191 192 static void virtio_mem_pci_instance_init(Object *obj) 193 { 194 VirtIOMEMPCI *dev = VIRTIO_MEM_PCI(obj); 195 VirtIOMEMClass *vmc; 196 VirtIOMEM *vmem; 197 198 virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev), 199 TYPE_VIRTIO_MEM); 200 201 dev->size_change_notifier.notify = virtio_mem_pci_size_change_notify; 202 vmem = &dev->vdev; 203 vmc = VIRTIO_MEM_GET_CLASS(vmem); 204 /* 205 * We never remove the notifier again, as we expect both devices to 206 * disappear at the same time. 207 */ 208 vmc->add_size_change_notifier(vmem, &dev->size_change_notifier); 209 210 object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP, 211 OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP); 212 object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev), 213 VIRTIO_MEM_SIZE_PROP); 214 object_property_add(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP, "size", 215 virtio_mem_pci_get_requested_size, 216 virtio_mem_pci_set_requested_size, NULL, NULL); 217 } 218 219 static const VirtioPCIDeviceTypeInfo virtio_mem_pci_info = { 220 .base_name = TYPE_VIRTIO_MEM_PCI, 221 .parent = TYPE_VIRTIO_MD_PCI, 222 .generic_name = "virtio-mem-pci", 223 .instance_size = sizeof(VirtIOMEMPCI), 224 .instance_init = virtio_mem_pci_instance_init, 225 .class_init = virtio_mem_pci_class_init, 226 }; 227 228 static void virtio_mem_pci_register_types(void) 229 { 230 virtio_pci_types_register(&virtio_mem_pci_info); 231 } 232 type_init(virtio_mem_pci_register_types) 233