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
virtio_mem_pci_realize(VirtIOPCIProxy * vpci_dev,Error ** errp)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
virtio_mem_pci_set_addr(MemoryDeviceState * md,uint64_t addr,Error ** errp)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
virtio_mem_pci_get_addr(const MemoryDeviceState * md)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
virtio_mem_pci_get_memory_region(MemoryDeviceState * md,Error ** errp)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
virtio_mem_pci_decide_memslots(MemoryDeviceState * md,unsigned int limit)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
virtio_mem_pci_get_memslots(MemoryDeviceState * md)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
virtio_mem_pci_get_plugged_size(const MemoryDeviceState * md,Error ** errp)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
virtio_mem_pci_fill_device_info(const MemoryDeviceState * md,MemoryDeviceInfo * info)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
virtio_mem_pci_get_min_alignment(const MemoryDeviceState * md)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
virtio_mem_pci_size_change_notify(Notifier * notifier,void * data)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
virtio_mem_pci_unplug_request_check(VirtIOMDPCI * vmd,Error ** errp)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
virtio_mem_pci_get_requested_size(Object * obj,Visitor * v,const char * name,void * opaque,Error ** errp)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
virtio_mem_pci_set_requested_size(Object * obj,Visitor * v,const char * name,void * opaque,Error ** errp)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
virtio_mem_pci_class_init(ObjectClass * klass,void * data)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
virtio_mem_pci_instance_init(Object * obj)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
virtio_mem_pci_register_types(void)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