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 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)