From: Jagannathan Raman
PCI host bridge is setup for the remote device process. It is
implemented using remote-pcihost object. It is an extension of the PCI
host bridge setup by QEMU.
Remote-pcihost configures a PCI bus which could be used by the remote
PCI device to latch on to.
Signed-off-by: Jagannathan Raman
Signed-off-by: John G Johnson
Signed-off-by: Elena Ufimtseva
Reviewed-by: Stefan Hajnoczi
Message-id:
0871ba857abb2eafacde07e7fe66a3f12415bfb2.1611938319.git.jag.ra...@oracle.com
Signed-off-by: Stefan Hajnoczi
---
MAINTAINERS | 2 +
include/hw/pci-host/remote.h | 29 ++
hw/pci-host/remote.c | 75
hw/pci-host/Kconfig | 3 ++
hw/pci-host/meson.build | 1 +
hw/remote/Kconfig| 1 +
6 files changed, 111 insertions(+)
create mode 100644 include/hw/pci-host/remote.h
create mode 100644 hw/pci-host/remote.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 9d2fe7f8db..45e777bc55 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3201,6 +3201,8 @@ M: John G Johnson
S: Maintained
F: docs/devel/multi-process.rst
F: docs/system/multi-process.rst
+F: hw/pci-host/remote.c
+F: include/hw/pci-host/remote.h
Build and test automation
-
diff --git a/include/hw/pci-host/remote.h b/include/hw/pci-host/remote.h
new file mode 100644
index 00..06b8a83a4b
--- /dev/null
+++ b/include/hw/pci-host/remote.h
@@ -0,0 +1,29 @@
+/*
+ * PCI Host for remote device
+ *
+ * Copyright © 2018, 2021 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_PCIHOST_H
+#define REMOTE_PCIHOST_H
+
+#include "exec/memory.h"
+#include "hw/pci/pcie_host.h"
+
+#define TYPE_REMOTE_PCIHOST "remote-pcihost"
+OBJECT_DECLARE_SIMPLE_TYPE(RemotePCIHost, REMOTE_PCIHOST)
+
+struct RemotePCIHost {
+/*< private >*/
+PCIExpressHost parent_obj;
+/*< public >*/
+
+MemoryRegion *mr_pci_mem;
+MemoryRegion *mr_sys_io;
+};
+
+#endif
diff --git a/hw/pci-host/remote.c b/hw/pci-host/remote.c
new file mode 100644
index 00..eee45444ef
--- /dev/null
+++ b/hw/pci-host/remote.c
@@ -0,0 +1,75 @@
+/*
+ * Remote PCI host device
+ *
+ * Unlike PCI host devices that model physical hardware, the purpose
+ * of this PCI host is to host multi-process QEMU devices.
+ *
+ * Multi-process QEMU extends the PCI host of a QEMU machine into a
+ * remote process. Any PCI device attached to the remote process is
+ * visible in the QEMU guest. This allows existing QEMU device models
+ * to be reused in the remote process.
+ *
+ * This PCI host is purely a container for PCI devices. It's fake in the
+ * sense that the guest never sees this PCI host and has no way of
+ * accessing it. Its job is just to provide the environment that QEMU
+ * PCI device models need when running in a remote process.
+ *
+ * Copyright © 2018, 2021 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/pci/pci.h"
+#include "hw/pci/pci_host.h"
+#include "hw/pci/pcie_host.h"
+#include "hw/qdev-properties.h"
+#include "hw/pci-host/remote.h"
+#include "exec/memory.h"
+
+static const char *remote_pcihost_root_bus_path(PCIHostState *host_bridge,
+PCIBus *rootbus)
+{
+return ":00";
+}
+
+static void remote_pcihost_realize(DeviceState *dev, Error **errp)
+{
+PCIHostState *pci = PCI_HOST_BRIDGE(dev);
+RemotePCIHost *s = REMOTE_PCIHOST(dev);
+
+pci->bus = pci_root_bus_new(DEVICE(s), "remote-pci",
+s->mr_pci_mem, s->mr_sys_io,
+0, TYPE_PCIE_BUS);
+}
+
+static void remote_pcihost_class_init(ObjectClass *klass, void *data)
+{
+DeviceClass *dc = DEVICE_CLASS(klass);
+PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
+
+hc->root_bus_path = remote_pcihost_root_bus_path;
+dc->realize = remote_pcihost_realize;
+
+dc->user_creatable = false;
+set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+dc->fw_name = "pci";
+}
+
+static const TypeInfo remote_pcihost_info = {
+.name = TYPE_REMOTE_PCIHOST,
+.parent = TYPE_PCIE_HOST_BRIDGE,
+.instance_size = sizeof(RemotePCIHost),
+.class_init = remote_pcihost_class_init,
+};
+
+static void remote_pcihost_register(void)
+{
+type_register_static(_pcihost_info);
+}
+
+type_init(remote_pcihost_register)
diff --git a/hw/pci-host/Kconfig b/hw/pci-host/Kconfig
index eb03f0489d..8b8c763c28 100644
--- a/hw/pci-host/Kconfig
+++ b/hw/pci-host/Kconfig
@@ -65,3 +65,6 @@ config PCI_POWERNV
select PCI_EXPRESS
select MSI_NONBROKEN
select PCIE_PORT
+
+config REMOTE_PCIHOST
+bool
diff --git a/hw/pci-host/meson.build
