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