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David Hildenbrand0b9a2442020-06-26 09:22:38 +02001/*
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"
Philippe Mathieu-Daudéb495ec62020-09-13 21:53:46 +020017#include "qapi/qapi-events-machine.h"
David Hildenbrand722a3c72020-06-26 09:22:44 +020018#include "qapi/qapi-events-misc.h"
David Hildenbrand0b9a2442020-06-26 09:22:38 +020019
20static 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
David Hildenbrandc22aba12020-07-27 13:59:05 +020025 virtio_pci_force_virtio_1(vpci_dev);
26 qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
David Hildenbrand0b9a2442020-06-26 09:22:38 +020027}
28
29static void virtio_mem_pci_set_addr(MemoryDeviceState *md, uint64_t addr,
30 Error **errp)
31{
Markus Armbruster5325cc32020-07-07 18:05:54 +020032 object_property_set_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP, addr, errp);
David Hildenbrand0b9a2442020-06-26 09:22:38 +020033}
34
35static 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
41static MemoryRegion *virtio_mem_pci_get_memory_region(MemoryDeviceState *md,
42 Error **errp)
43{
44 VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md);
Philippe Mathieu-Daudé7d5b0d62023-06-01 11:34:52 +020045 VirtIOMEM *vmem = &pci_mem->vdev;
David Hildenbrand0b9a2442020-06-26 09:22:38 +020046 VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
47
48 return vmc->get_memory_region(vmem, errp);
49}
50
51static 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
58static 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);
Philippe Mathieu-Daudé7d5b0d62023-06-01 11:34:52 +020063 VirtIOMEM *vmem = &pci_mem->vdev;
David Hildenbrand0b9a2442020-06-26 09:22:38 +020064 VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
65 DeviceState *dev = DEVICE(md);
66
67 if (dev->id) {
David Hildenbrand0b9a2442020-06-26 09:22:38 +020068 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
David Hildenbrand296e88f2020-10-08 10:30:29 +020078static 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
David Hildenbrand722a3c72020-06-26 09:22:44 +020084static 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);
David Hildenbrandd89dd282021-09-29 18:24:44 +020089 char *qom_path = object_get_canonical_path(OBJECT(dev));
David Hildenbrand722a3c72020-06-26 09:22:44 +020090 const uint64_t * const size_p = data;
David Hildenbrand722a3c72020-06-26 09:22:44 +020091
Markus Armbrusterfe8ac1f2022-11-04 17:06:57 +010092 qapi_event_send_memory_device_size_change(dev->id, *size_p, qom_path);
David Hildenbrandd89dd282021-09-29 18:24:44 +020093 g_free(qom_path);
David Hildenbrand722a3c72020-06-26 09:22:44 +020094}
95
David Hildenbrand339a8bb2023-07-11 17:34:45 +020096static 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
105static 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
114static 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
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200136static 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);
David Hildenbrand339a8bb2023-07-11 17:34:45 +0200142 VirtIOMDPCIClass *vmdc = VIRTIO_MD_PCI_CLASS(klass);
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200143
144 k->realize = virtio_mem_pci_realize;
145 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200146 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;
David Hildenbrand296e88f2020-10-08 10:30:29 +0200154 mdc->get_min_alignment = virtio_mem_pci_get_min_alignment;
David Hildenbrand339a8bb2023-07-11 17:34:45 +0200155
156 vmdc->unplug_request_check = virtio_mem_pci_unplug_request_check;
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200157}
158
159static void virtio_mem_pci_instance_init(Object *obj)
160{
161 VirtIOMEMPCI *dev = VIRTIO_MEM_PCI(obj);
David Hildenbrand722a3c72020-06-26 09:22:44 +0200162 VirtIOMEMClass *vmc;
163 VirtIOMEM *vmem;
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200164
165 virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
166 TYPE_VIRTIO_MEM);
David Hildenbrand722a3c72020-06-26 09:22:44 +0200167
168 dev->size_change_notifier.notify = virtio_mem_pci_size_change_notify;
Philippe Mathieu-Daudé7d5b0d62023-06-01 11:34:52 +0200169 vmem = &dev->vdev;
David Hildenbrand722a3c72020-06-26 09:22:44 +0200170 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
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200177 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);
David Hildenbrand339a8bb2023-07-11 17:34:45 +0200181 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);
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200184}
185
186static const VirtioPCIDeviceTypeInfo virtio_mem_pci_info = {
187 .base_name = TYPE_VIRTIO_MEM_PCI,
David Hildenbrand18129c12023-07-11 17:34:39 +0200188 .parent = TYPE_VIRTIO_MD_PCI,
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200189 .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,
David Hildenbrand0b9a2442020-06-26 09:22:38 +0200193};
194
195static void virtio_mem_pci_register_types(void)
196{
197 virtio_pci_types_register(&virtio_mem_pci_info);
198}
199type_init(virtio_mem_pci_register_types)