LXR qemu/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
  34static const char *remote_pcihost_root_bus_path(PCIHostState *host_bridge,
  35                                                PCIBus *rootbus)
  36{
  37    return "0000:00";
  38}
  39
  40static 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
  50static 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
  63static 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
  70static void remote_pcihost_register(void)
  71{
  72    type_register_static(&remote_pcihost_info);
  73}
  74
  75type_init(remote_pcihost_register)
  76