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