hw/remote/machine.c

   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/vfio-user-obj.h"
  26 #include "hw/pci/msi.h"
  27
  28 static void remote_machine_init(MachineState *machine)
  29 {
  30     MemoryRegion *system_memory, *system_io, *pci_memory;
  31     RemoteMachineState *s = REMOTE_MACHINE(machine);
  32     RemotePCIHost *rem_host;
  33     PCIHostState *pci_host;
  34
  35     system_memory = get_system_memory();
  36     system_io = get_system_io();
  37
  38     pci_memory = g_new(MemoryRegion, 1);
  39     memory_region_init(pci_memory, NULL, "pci", UINT64_MAX);
  40
  41     rem_host = REMOTE_PCIHOST(qdev_new(TYPE_REMOTE_PCIHOST));
  42
  43     rem_host->mr_pci_mem = pci_memory;
  44     rem_host->mr_sys_mem = system_memory;
  45     rem_host->mr_sys_io = system_io;
  46
  47     s->host = rem_host;
  48
  49     object_property_add_child(OBJECT(s), "remote-pcihost", OBJECT(rem_host));
  50     memory_region_add_subregion_overlap(system_memory, 0x0, pci_memory, -1);
  51
  52     qdev_realize(DEVICE(rem_host), sysbus_get_default(), &error_fatal);
  53
  54     pci_host = PCI_HOST_BRIDGE(rem_host);
  55
  56     if (s->vfio_user) {
  57         remote_iommu_setup(pci_host->bus);
  58
  59         msi_nonbroken = true;
  60
  61         vfu_object_set_bus_irq(pci_host->bus);
  62     } else {
  63         remote_iohub_init(&s->iohub);
  64
  65         pci_bus_irqs(pci_host->bus, remote_iohub_set_irq,
  66                      &s->iohub, REMOTE_IOHUB_NB_PIRQS);
  67         pci_bus_map_irqs(pci_host->bus, remote_iohub_map_irq);
  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);