hw/virtio/virtio-mem-pci.c

   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)