xref: /openbmc/qemu/hw/remote/machine.c (revision af2ae2e8)
1 /*
2  * Machine for remote device
3  *
4  *  This machine type is used by the remote device process in multi-process
5  *  QEMU. QEMU device models depend on parent busses, interrupt controllers,
6  *  memory regions, etc. The remote machine type offers this environment so
7  *  that QEMU device models can be used as remote devices.
8  *
9  * Copyright © 2018, 2021 Oracle and/or its affiliates.
10  *
11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
12  * See the COPYING file in the top-level directory.
13  *
14  */
15 
16 #include "qemu/osdep.h"
17 
18 #include "hw/remote/machine.h"
19 #include "exec/memory.h"
20 #include "qapi/error.h"
21 #include "hw/pci/pci_host.h"
22 #include "hw/remote/iohub.h"
23 #include "hw/remote/iommu.h"
24 #include "hw/qdev-core.h"
25 #include "hw/remote/iommu.h"
26 #include "hw/remote/vfio-user-obj.h"
27 #include "hw/pci/msi.h"
28 
29 static void remote_machine_init(MachineState *machine)
30 {
31     MemoryRegion *system_memory, *system_io, *pci_memory;
32     RemoteMachineState *s = REMOTE_MACHINE(machine);
33     RemotePCIHost *rem_host;
34     PCIHostState *pci_host;
35 
36     system_memory = get_system_memory();
37     system_io = get_system_io();
38 
39     pci_memory = g_new(MemoryRegion, 1);
40     memory_region_init(pci_memory, NULL, "pci", UINT64_MAX);
41 
42     rem_host = REMOTE_PCIHOST(qdev_new(TYPE_REMOTE_PCIHOST));
43 
44     rem_host->mr_pci_mem = pci_memory;
45     rem_host->mr_sys_mem = system_memory;
46     rem_host->mr_sys_io = system_io;
47 
48     s->host = rem_host;
49 
50     object_property_add_child(OBJECT(s), "remote-pcihost", OBJECT(rem_host));
51     memory_region_add_subregion_overlap(system_memory, 0x0, pci_memory, -1);
52 
53     qdev_realize(DEVICE(rem_host), sysbus_get_default(), &error_fatal);
54 
55     pci_host = PCI_HOST_BRIDGE(rem_host);
56 
57     if (s->vfio_user) {
58         remote_iommu_setup(pci_host->bus);
59 
60         msi_nonbroken = true;
61 
62         vfu_object_set_bus_irq(pci_host->bus);
63     } else {
64         remote_iohub_init(&s->iohub);
65 
66         pci_bus_irqs(pci_host->bus, remote_iohub_set_irq, remote_iohub_map_irq,
67                      &s->iohub, REMOTE_IOHUB_NB_PIRQS);
68     }
69 
70     qbus_set_hotplug_handler(BUS(pci_host->bus), OBJECT(s));
71 }
72 
73 static bool remote_machine_get_vfio_user(Object *obj, Error **errp)
74 {
75     RemoteMachineState *s = REMOTE_MACHINE(obj);
76 
77     return s->vfio_user;
78 }
79 
80 static void remote_machine_set_vfio_user(Object *obj, bool value, Error **errp)
81 {
82     RemoteMachineState *s = REMOTE_MACHINE(obj);
83 
84     if (phase_check(PHASE_MACHINE_CREATED)) {
85         error_setg(errp, "Error enabling vfio-user - machine already created");
86         return;
87     }
88 
89     s->vfio_user = value;
90 }
91 
92 static bool remote_machine_get_auto_shutdown(Object *obj, Error **errp)
93 {
94     RemoteMachineState *s = REMOTE_MACHINE(obj);
95 
96     return s->auto_shutdown;
97 }
98 
99 static void remote_machine_set_auto_shutdown(Object *obj, bool value,
100                                              Error **errp)
101 {
102     RemoteMachineState *s = REMOTE_MACHINE(obj);
103 
104     s->auto_shutdown = value;
105 }
106 
107 static void remote_machine_instance_init(Object *obj)
108 {
109     RemoteMachineState *s = REMOTE_MACHINE(obj);
110 
111     s->auto_shutdown = true;
112 }
113 
114 static void remote_machine_dev_unplug_cb(HotplugHandler *hotplug_dev,
115                                          DeviceState *dev, Error **errp)
116 {
117     qdev_unrealize(dev);
118 
119     if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
120         remote_iommu_unplug_dev(PCI_DEVICE(dev));
121     }
122 }
123 
124 static void remote_machine_class_init(ObjectClass *oc, void *data)
125 {
126     MachineClass *mc = MACHINE_CLASS(oc);
127     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
128 
129     mc->init = remote_machine_init;
130     mc->desc = "Experimental remote machine";
131 
132     hc->unplug = remote_machine_dev_unplug_cb;
133 
134     object_class_property_add_bool(oc, "vfio-user",
135                                    remote_machine_get_vfio_user,
136                                    remote_machine_set_vfio_user);
137 
138     object_class_property_add_bool(oc, "auto-shutdown",
139                                    remote_machine_get_auto_shutdown,
140                                    remote_machine_set_auto_shutdown);
141 }
142 
143 static const TypeInfo remote_machine = {
144     .name = TYPE_REMOTE_MACHINE,
145     .parent = TYPE_MACHINE,
146     .instance_size = sizeof(RemoteMachineState),
147     .instance_init = remote_machine_instance_init,
148     .class_init = remote_machine_class_init,
149     .interfaces = (InterfaceInfo[]) {
150         { TYPE_HOTPLUG_HANDLER },
151         { }
152     }
153 };
154 
155 static void remote_machine_register_types(void)
156 {
157     type_register_static(&remote_machine);
158 }
159 
160 type_init(remote_machine_register_types);
161