Merge tag 'pull-testing-gdbstub-plugins-gitdm-061022-3' of https://github.com/stsquad...
[qemu.git] / hw / pci-host / remote.c
1 /*
2 * Remote PCI host device
3 *
4 * Unlike PCI host devices that model physical hardware, the purpose
5 * of this PCI host is to host multi-process QEMU devices.
6 *
7 * Multi-process QEMU extends the PCI host of a QEMU machine into a
8 * remote process. Any PCI device attached to the remote process is
9 * visible in the QEMU guest. This allows existing QEMU device models
10 * to be reused in the remote process.
11 *
12 * This PCI host is purely a container for PCI devices. It's fake in the
13 * sense that the guest never sees this PCI host and has no way of
14 * accessing it. Its job is just to provide the environment that QEMU
15 * PCI device models need when running in a remote process.
16 *
17 * Copyright © 2018, 2021 Oracle and/or its affiliates.
18 *
19 * This work is licensed under the terms of the GNU GPL, version 2 or later.
20 * See the COPYING file in the top-level directory.
21 *
22 */
23
24 #include "qemu/osdep.h"
25 #include "qemu-common.h"
26
27 #include "hw/pci/pci.h"
28 #include "hw/pci/pci_host.h"
29 #include "hw/pci/pcie_host.h"
30 #include "hw/qdev-properties.h"
31 #include "hw/pci-host/remote.h"
32 #include "exec/memory.h"
33
34 static const char *remote_pcihost_root_bus_path(PCIHostState *host_bridge,
35 PCIBus *rootbus)
36 {
37 return "0000:00";
38 }
39
40 static void remote_pcihost_realize(DeviceState *dev, Error **errp)
41 {
42 PCIHostState *pci = PCI_HOST_BRIDGE(dev);
43 RemotePCIHost *s = REMOTE_PCIHOST(dev);
44
45 pci->bus = pci_root_bus_new(DEVICE(s), "remote-pci",
46 s->mr_pci_mem, s->mr_sys_io,
47 0, TYPE_PCIE_BUS);
48 }
49
50 static void remote_pcihost_class_init(ObjectClass *klass, void *data)
51 {
52 DeviceClass *dc = DEVICE_CLASS(klass);
53 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
54
55 hc->root_bus_path = remote_pcihost_root_bus_path;
56 dc->realize = remote_pcihost_realize;
57
58 dc->user_creatable = false;
59 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
60 dc->fw_name = "pci";
61 }
62
63 static const TypeInfo remote_pcihost_info = {
64 .name = TYPE_REMOTE_PCIHOST,
65 .parent = TYPE_PCIE_HOST_BRIDGE,
66 .instance_size = sizeof(RemotePCIHost),
67 .class_init = remote_pcihost_class_init,
68 };
69
70 static void remote_pcihost_register(void)
71 {
72 type_register_static(&remote_pcihost_info);
73 }
74
75 type_init(remote_pcihost_register)