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
26 #include "hw/pci/pci.h"
27 #include "hw/pci/pci_host.h"
28 #include "hw/pci/pcie_host.h"
29 #include "hw/qdev-properties.h"
30 #include "hw/pci-host/remote.h"
31 #include "exec/memory.h"
32
remote_pcihost_root_bus_path(PCIHostState * host_bridge,PCIBus * rootbus)33 static const char *remote_pcihost_root_bus_path(PCIHostState *host_bridge,
34 PCIBus *rootbus)
35 {
36 return "0000:00";
37 }
38
remote_pcihost_realize(DeviceState * dev,Error ** errp)39 static void remote_pcihost_realize(DeviceState *dev, Error **errp)
40 {
41 PCIHostState *pci = PCI_HOST_BRIDGE(dev);
42 RemotePCIHost *s = REMOTE_PCIHOST(dev);
43
44 pci->bus = pci_root_bus_new(DEVICE(s), "remote-pci",
45 s->mr_pci_mem, s->mr_sys_io,
46 0, TYPE_PCIE_BUS);
47 }
48
remote_pcihost_class_init(ObjectClass * klass,void * data)49 static void remote_pcihost_class_init(ObjectClass *klass, void *data)
50 {
51 DeviceClass *dc = DEVICE_CLASS(klass);
52 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
53
54 hc->root_bus_path = remote_pcihost_root_bus_path;
55 dc->realize = remote_pcihost_realize;
56
57 dc->user_creatable = false;
58 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
59 dc->fw_name = "pci";
60 }
61
62 static const TypeInfo remote_pcihost_info = {
63 .name = TYPE_REMOTE_PCIHOST,
64 .parent = TYPE_PCIE_HOST_BRIDGE,
65 .instance_size = sizeof(RemotePCIHost),
66 .class_init = remote_pcihost_class_init,
67 };
68
remote_pcihost_register(void)69 static void remote_pcihost_register(void)
70 {
71 type_register_static(&remote_pcihost_info);
72 }
73
74 type_init(remote_pcihost_register)
75