|
| 1 | +/* |
| 2 | + * virtio-mem CCW implementation |
| 3 | + * |
| 4 | + * Copyright (C) 2024 Red Hat, Inc. |
| 5 | + * |
| 6 | + * Authors: |
| 7 | + * David Hildenbrand <[email protected]> |
| 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 "hw/qdev-properties.h" |
| 15 | +#include "qapi/error.h" |
| 16 | +#include "qemu/module.h" |
| 17 | +#include "virtio-ccw-mem.h" |
| 18 | +#include "hw/mem/memory-device.h" |
| 19 | +#include "qapi/qapi-events-machine.h" |
| 20 | +#include "qapi/qapi-events-misc.h" |
| 21 | + |
| 22 | +static void virtio_ccw_mem_realize(VirtioCcwDevice *ccw_dev, Error **errp) |
| 23 | +{ |
| 24 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(ccw_dev); |
| 25 | + DeviceState *vdev = DEVICE(&dev->vdev); |
| 26 | + |
| 27 | + qdev_realize(vdev, BUS(&ccw_dev->bus), errp); |
| 28 | +} |
| 29 | + |
| 30 | +static void virtio_ccw_mem_set_addr(MemoryDeviceState *md, uint64_t addr, |
| 31 | + Error **errp) |
| 32 | +{ |
| 33 | + object_property_set_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP, addr, errp); |
| 34 | +} |
| 35 | + |
| 36 | +static uint64_t virtio_ccw_mem_get_addr(const MemoryDeviceState *md) |
| 37 | +{ |
| 38 | + return object_property_get_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP, |
| 39 | + &error_abort); |
| 40 | +} |
| 41 | + |
| 42 | +static MemoryRegion *virtio_ccw_mem_get_memory_region(MemoryDeviceState *md, |
| 43 | + Error **errp) |
| 44 | +{ |
| 45 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md); |
| 46 | + VirtIOMEM *vmem = &dev->vdev; |
| 47 | + VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); |
| 48 | + |
| 49 | + return vmc->get_memory_region(vmem, errp); |
| 50 | +} |
| 51 | + |
| 52 | +static void virtio_ccw_mem_decide_memslots(MemoryDeviceState *md, |
| 53 | + unsigned int limit) |
| 54 | +{ |
| 55 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md); |
| 56 | + VirtIOMEM *vmem = VIRTIO_MEM(&dev->vdev); |
| 57 | + VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); |
| 58 | + |
| 59 | + vmc->decide_memslots(vmem, limit); |
| 60 | +} |
| 61 | + |
| 62 | +static unsigned int virtio_ccw_mem_get_memslots(MemoryDeviceState *md) |
| 63 | +{ |
| 64 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md); |
| 65 | + VirtIOMEM *vmem = VIRTIO_MEM(&dev->vdev); |
| 66 | + VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); |
| 67 | + |
| 68 | + return vmc->get_memslots(vmem); |
| 69 | +} |
| 70 | + |
| 71 | +static uint64_t virtio_ccw_mem_get_plugged_size(const MemoryDeviceState *md, |
| 72 | + Error **errp) |
| 73 | +{ |
| 74 | + return object_property_get_uint(OBJECT(md), VIRTIO_MEM_SIZE_PROP, |
| 75 | + errp); |
| 76 | +} |
| 77 | + |
| 78 | +static void virtio_ccw_mem_fill_device_info(const MemoryDeviceState *md, |
| 79 | + MemoryDeviceInfo *info) |
| 80 | +{ |
| 81 | + VirtioMEMDeviceInfo *vi = g_new0(VirtioMEMDeviceInfo, 1); |
| 82 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md); |
| 83 | + VirtIOMEM *vmem = &dev->vdev; |
| 84 | + VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem); |
| 85 | + DeviceState *vdev = DEVICE(md); |
| 86 | + |
| 87 | + if (vdev->id) { |
| 88 | + vi->id = g_strdup(vdev->id); |
| 89 | + } |
| 90 | + |
| 91 | + /* let the real device handle everything else */ |
| 92 | + vpc->fill_device_info(vmem, vi); |
| 93 | + |
| 94 | + info->u.virtio_mem.data = vi; |
| 95 | + info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM; |
| 96 | +} |
| 97 | + |
| 98 | +static uint64_t virtio_ccw_mem_get_min_alignment(const MemoryDeviceState *md) |
| 99 | +{ |
| 100 | + return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP, |
| 101 | + &error_abort); |
| 102 | +} |
| 103 | + |
| 104 | +static void virtio_ccw_mem_size_change_notify(Notifier *notifier, void *data) |
| 105 | +{ |
| 106 | + VirtIOMEMCcw *dev = container_of(notifier, VirtIOMEMCcw, |
| 107 | + size_change_notifier); |
| 108 | + DeviceState *vdev = DEVICE(dev); |
| 109 | + char *qom_path = object_get_canonical_path(OBJECT(dev)); |
| 110 | + const uint64_t * const size_p = data; |
| 111 | + |
| 112 | + qapi_event_send_memory_device_size_change(vdev->id, *size_p, qom_path); |
| 113 | + g_free(qom_path); |
| 114 | +} |
| 115 | + |
| 116 | +static void virtio_ccw_mem_unplug_request_check(VirtIOMDCcw *vmd, Error **errp) |
| 117 | +{ |
| 118 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(vmd); |
| 119 | + VirtIOMEM *vmem = &dev->vdev; |
| 120 | + VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem); |
| 121 | + |
| 122 | + vpc->unplug_request_check(vmem, errp); |
| 123 | +} |
| 124 | + |
| 125 | +static void virtio_ccw_mem_get_requested_size(Object *obj, Visitor *v, |
| 126 | + const char *name, void *opaque, |
| 127 | + Error **errp) |
| 128 | +{ |
| 129 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj); |
| 130 | + |
| 131 | + object_property_get(OBJECT(&dev->vdev), name, v, errp); |
| 132 | +} |
| 133 | + |
| 134 | +static void virtio_ccw_mem_set_requested_size(Object *obj, Visitor *v, |
| 135 | + const char *name, void *opaque, |
| 136 | + Error **errp) |
| 137 | +{ |
| 138 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj); |
| 139 | + DeviceState *vdev = DEVICE(obj); |
| 140 | + |
| 141 | + /* |
| 142 | + * If we passed virtio_ccw_mem_unplug_request_check(), making sure that |
| 143 | + * the requested size is 0, don't allow modifying the requested size |
| 144 | + * anymore, otherwise the VM might end up hotplugging memory before |
| 145 | + * handling the unplug request. |
| 146 | + */ |
| 147 | + if (vdev->pending_deleted_event) { |
| 148 | + error_setg(errp, "'%s' cannot be changed if the device is in the" |
| 149 | + " process of unplug", name); |
| 150 | + return; |
| 151 | + } |
| 152 | + |
| 153 | + object_property_set(OBJECT(&dev->vdev), name, v, errp); |
| 154 | +} |
| 155 | + |
| 156 | +static Property virtio_ccw_mem_properties[] = { |
| 157 | + DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags, |
| 158 | + VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true), |
| 159 | + DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, |
| 160 | + VIRTIO_CCW_MAX_REV), |
| 161 | + DEFINE_PROP_END_OF_LIST(), |
| 162 | +}; |
| 163 | + |
| 164 | +static void virtio_ccw_mem_class_init(ObjectClass *klass, void *data) |
| 165 | +{ |
| 166 | + DeviceClass *dc = DEVICE_CLASS(klass); |
| 167 | + VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass); |
| 168 | + MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass); |
| 169 | + VirtIOMDCcwClass *vmdc = VIRTIO_MD_CCW_CLASS(klass); |
| 170 | + |
| 171 | + k->realize = virtio_ccw_mem_realize; |
| 172 | + set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| 173 | + device_class_set_props(dc, virtio_ccw_mem_properties); |
| 174 | + |
| 175 | + mdc->get_addr = virtio_ccw_mem_get_addr; |
| 176 | + mdc->set_addr = virtio_ccw_mem_set_addr; |
| 177 | + mdc->get_plugged_size = virtio_ccw_mem_get_plugged_size; |
| 178 | + mdc->get_memory_region = virtio_ccw_mem_get_memory_region; |
| 179 | + mdc->decide_memslots = virtio_ccw_mem_decide_memslots; |
| 180 | + mdc->get_memslots = virtio_ccw_mem_get_memslots; |
| 181 | + mdc->fill_device_info = virtio_ccw_mem_fill_device_info; |
| 182 | + mdc->get_min_alignment = virtio_ccw_mem_get_min_alignment; |
| 183 | + |
| 184 | + vmdc->unplug_request_check = virtio_ccw_mem_unplug_request_check; |
| 185 | +} |
| 186 | + |
| 187 | +static void virtio_ccw_mem_instance_init(Object *obj) |
| 188 | +{ |
| 189 | + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj); |
| 190 | + VirtIOMEMClass *vmc; |
| 191 | + VirtIOMEM *vmem; |
| 192 | + |
| 193 | + virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev), |
| 194 | + TYPE_VIRTIO_MEM); |
| 195 | + |
| 196 | + dev->size_change_notifier.notify = virtio_ccw_mem_size_change_notify; |
| 197 | + vmem = &dev->vdev; |
| 198 | + vmc = VIRTIO_MEM_GET_CLASS(vmem); |
| 199 | + /* |
| 200 | + * We never remove the notifier again, as we expect both devices to |
| 201 | + * disappear at the same time. |
| 202 | + */ |
| 203 | + vmc->add_size_change_notifier(vmem, &dev->size_change_notifier); |
| 204 | + |
| 205 | + object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP, |
| 206 | + OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP); |
| 207 | + object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev), |
| 208 | + VIRTIO_MEM_SIZE_PROP); |
| 209 | + object_property_add(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP, "size", |
| 210 | + virtio_ccw_mem_get_requested_size, |
| 211 | + virtio_ccw_mem_set_requested_size, NULL, NULL); |
| 212 | +} |
| 213 | + |
| 214 | +static const TypeInfo virtio_ccw_mem = { |
| 215 | + .name = TYPE_VIRTIO_MEM_CCW, |
| 216 | + .parent = TYPE_VIRTIO_MD_CCW, |
| 217 | + .instance_size = sizeof(VirtIOMEMCcw), |
| 218 | + .instance_init = virtio_ccw_mem_instance_init, |
| 219 | + .class_init = virtio_ccw_mem_class_init, |
| 220 | +}; |
| 221 | + |
| 222 | +static void virtio_ccw_mem_register_types(void) |
| 223 | +{ |
| 224 | + type_register_static(&virtio_ccw_mem); |
| 225 | +} |
| 226 | +type_init(virtio_ccw_mem_register_types) |
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