[PATCH v11 04/19] multi-process: setup a machine object for remote device process

[Jagannathan Raman <jag.raman@oracle.com>]

remote-machine object sets up various subsystems of the remote
device process. Instantiate PCI host bridge object and initialize RAM, IO &
PCI memory regions.

Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 MAINTAINERS                  |  2 ++
 hw/i386/meson.build          |  1 +
 hw/i386/remote.c             | 69 ++++++++++++++++++++++++++++++++++++++++++++
 include/hw/i386/remote.h     | 28 ++++++++++++++++++
 include/hw/pci-host/remote.h |  1 +
 5 files changed, 101 insertions(+)
 create mode 100644 hw/i386/remote.c
 create mode 100644 include/hw/i386/remote.h

diff --git a/MAINTAINERS b/MAINTAINERS
index bb1d701..12945ee 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3102,6 +3102,8 @@ M: John G Johnson <john.g.johnson@oracle.com>
 S: Maintained
 F: hw/pci-host/remote.c
 F: include/hw/pci-host/remote.h
+F: hw/i386/remote.c
+F: include/hw/i386/remote.h
 
 Build and test automation
 -------------------------
diff --git a/hw/i386/meson.build b/hw/i386/meson.build
index e5d109f..d9d4f40 100644
--- a/hw/i386/meson.build
+++ b/hw/i386/meson.build
@@ -24,6 +24,7 @@ i386_ss.add(when: 'CONFIG_PC', if_true: files(
   'pc_sysfw.c',
   'acpi-build.c',
   'port92.c'))
+i386_ss.add(when: 'CONFIG_MPQEMU', if_true: files('remote.c'))
 
 subdir('kvm')
 subdir('xen')
diff --git a/hw/i386/remote.c b/hw/i386/remote.c
new file mode 100644
index 0000000..a67be33
--- /dev/null
+++ b/hw/i386/remote.c
@@ -0,0 +1,69 @@
+/*
+ * Machine for remote device
+ *
+ *  This machine type is used by the remote device process in multi-process
+ *  QEMU. QEMU device models depend on parent busses, interrupt controllers,
+ *  memory regions, etc. The remote machine type offers this environment so
+ *  that QEMU device models can be used as remote devices.
+ *
+ * Copyright © 2018, 2020 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+
+#include "hw/i386/remote.h"
+#include "exec/address-spaces.h"
+#include "exec/memory.h"
+#include "qapi/error.h"
+
+static void remote_machine_init(MachineState *machine)
+{
+    MemoryRegion *system_memory, *system_io, *pci_memory;
+    RemoteMachineState *s = REMOTE_MACHINE(machine);
+    RemotePCIHost *rem_host;
+
+    system_memory = get_system_memory();
+    system_io = get_system_io();
+
+    pci_memory = g_new(MemoryRegion, 1);
+    memory_region_init(pci_memory, NULL, "pci", UINT64_MAX);
+
+    rem_host = REMOTE_HOST_DEVICE(qdev_new(TYPE_REMOTE_HOST_DEVICE));
+
+    rem_host->mr_pci_mem = pci_memory;
+    rem_host->mr_sys_mem = system_memory;
+    rem_host->mr_sys_io = system_io;
+
+    s->host = rem_host;
+
+    object_property_add_child(OBJECT(s), "remote-device", OBJECT(rem_host));
+    memory_region_add_subregion_overlap(system_memory, 0x0, pci_memory, -1);
+
+    qdev_realize(DEVICE(rem_host), sysbus_get_default(), &error_fatal);
+}
+
+static void remote_machine_class_init(ObjectClass *oc, void *data)
+{
+    MachineClass *mc = MACHINE_CLASS(oc);
+
+    mc->init = remote_machine_init;
+}
+
+static const TypeInfo remote_machine = {
+    .name = TYPE_REMOTE_MACHINE,
+    .parent = TYPE_MACHINE,
+    .instance_size = sizeof(RemoteMachineState),
+    .class_init = remote_machine_class_init,
+};
+
+static void remote_machine_register_types(void)
+{
+    type_register_static(&remote_machine);
+}
+
+type_init(remote_machine_register_types);
diff --git a/include/hw/i386/remote.h b/include/hw/i386/remote.h
new file mode 100644
index 0000000..d312972
--- /dev/null
+++ b/include/hw/i386/remote.h
@@ -0,0 +1,28 @@
+/*
+ * Remote machine configuration
+ *
+ * Copyright © 2018, 2020 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef REMOTE_MACHINE_H
+#define REMOTE_MACHINE_H
+
+#include "qom/object.h"
+#include "hw/boards.h"
+#include "hw/pci-host/remote.h"
+
+typedef struct RemoteMachineState {
+    MachineState parent_obj;
+
+    RemotePCIHost *host;
+} RemoteMachineState;
+
+#define TYPE_REMOTE_MACHINE "x-remote-machine"
+#define REMOTE_MACHINE(obj) \
+    OBJECT_CHECK(RemoteMachineState, (obj), TYPE_REMOTE_MACHINE)
+
+#endif
diff --git a/include/hw/pci-host/remote.h b/include/hw/pci-host/remote.h
index bab6d3c..cc0fff4 100644
--- a/include/hw/pci-host/remote.h
+++ b/include/hw/pci-host/remote.h
@@ -25,6 +25,7 @@ typedef struct RemotePCIHost {
 
     MemoryRegion *mr_pci_mem;
     MemoryRegion *mr_sys_io;
+    MemoryRegion *mr_sys_mem;
 } RemotePCIHost;
 
 #endif
-- 
1.8.3.1