[PATCH v6 17/36] multi-process: introduce proxy object

[elena . ufimtseva]

From: Elena Ufimtseva <address@hidden>

Defines a PCI Device proxy object as a parent of TYPE_PCI_DEVICE.

PCI Proxy Object registers as a PCI device with QEMU and forwards all
PCI accesses to the remote process using the communication channel.

Signed-off-by: Elena Ufimtseva <address@hidden>
Signed-off-by: Jagannathan Raman <address@hidden>
Signed-off-by: John G Johnson <address@hidden>
---
 MAINTAINERS                   |  3 ++
 hw/Makefile.objs              |  2 ++
 hw/proxy/Makefile.objs        |  1 +
 hw/proxy/qemu-proxy.c         | 56 +++++++++++++++++++++++++++++++++++
 include/hw/proxy/qemu-proxy.h | 46 ++++++++++++++++++++++++++++
 include/io/mpqemu-link.h      |  1 +
 6 files changed, 109 insertions(+)
 create mode 100644 hw/proxy/Makefile.objs
 create mode 100644 hw/proxy/qemu-proxy.c
 create mode 100644 include/hw/proxy/qemu-proxy.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 7b46ec2e71..e2ac5b08a4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2825,6 +2825,9 @@ F: include/remote/machine.h
 F: remote/machine.c
 F: include/remote/memory.h
 F: remote/memory.c
+F: hw/proxy/Makefile.objs
+F: hw/proxy/qemu-proxy.c
+F: include/hw/proxy/qemu-proxy.h
 
 Build and test automation
 -------------------------
diff --git a/hw/Makefile.objs b/hw/Makefile.objs
index af9235b6f2..7b489b12a5 100644
--- a/hw/Makefile.objs
+++ b/hw/Makefile.objs
@@ -45,6 +45,8 @@ endif
 common-obj-y += $(devices-dirs-y)
 obj-y += $(devices-dirs-y)
 
+common-obj-$(CONFIG_MPQEMU) += proxy/
+
 remote-pci-obj-$(CONFIG_MPQEMU) += core/
 remote-pci-obj-$(CONFIG_MPQEMU) += block/
 remote-pci-obj-$(CONFIG_MPQEMU) += pci/
diff --git a/hw/proxy/Makefile.objs b/hw/proxy/Makefile.objs
new file mode 100644
index 0000000000..eb81624cf8
--- /dev/null
+++ b/hw/proxy/Makefile.objs
@@ -0,0 +1 @@
+common-obj-$(CONFIG_MPQEMU) += qemu-proxy.o
diff --git a/hw/proxy/qemu-proxy.c b/hw/proxy/qemu-proxy.c
new file mode 100644
index 0000000000..bf6c4117ef
--- /dev/null
+++ b/hw/proxy/qemu-proxy.c
@@ -0,0 +1,56 @@
+/*
+ * 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 "qapi/error.h"
+#include "io/mpqemu-link.h"
+#include "hw/proxy/qemu-proxy.h"
+#include "hw/pci/pci.h"
+
+static void pci_proxy_dev_realize(PCIDevice *device, Error **errp)
+{
+    PCIProxyDev *dev = PCI_PROXY_DEV(device);
+    PCIProxyDevClass *k = PCI_PROXY_DEV_GET_CLASS(dev);
+    Error *local_err = NULL;
+
+    if (k->realize) {
+        k->realize(dev, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+        }
+    }
+}
+
+static void pci_proxy_dev_class_init(ObjectClass *klass, void *data)
+{
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->realize = pci_proxy_dev_realize;
+}
+
+static const TypeInfo pci_proxy_dev_type_info = {
+    .name          = TYPE_PCI_PROXY_DEV,
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(PCIProxyDev),
+    .class_size    = sizeof(PCIProxyDevClass),
+    .class_init    = pci_proxy_dev_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+        { },
+    },
+};
+
+static void pci_proxy_dev_register_types(void)
+{
+    type_register_static(&pci_proxy_dev_type_info);
+}
+
+type_init(pci_proxy_dev_register_types)
+
diff --git a/include/hw/proxy/qemu-proxy.h b/include/hw/proxy/qemu-proxy.h
new file mode 100644
index 0000000000..d7eaf26f29
--- /dev/null
+++ b/include/hw/proxy/qemu-proxy.h
@@ -0,0 +1,46 @@
+/*
+ * 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 QEMU_PROXY_H
+#define QEMU_PROXY_H
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+
+#include "io/mpqemu-link.h"
+#include "hw/pci/pci.h"
+
+#define TYPE_PCI_PROXY_DEV "pci-proxy-dev"
+
+#define PCI_PROXY_DEV(obj) \
+            OBJECT_CHECK(PCIProxyDev, (obj), TYPE_PCI_PROXY_DEV)
+
+#define PCI_PROXY_DEV_CLASS(klass) \
+            OBJECT_CLASS_CHECK(PCIProxyDevClass, (klass), TYPE_PCI_PROXY_DEV)
+
+#define PCI_PROXY_DEV_GET_CLASS(obj) \
+            OBJECT_GET_CLASS(PCIProxyDevClass, (obj), TYPE_PCI_PROXY_DEV)
+
+typedef struct PCIProxyDev {
+    PCIDevice parent_dev;
+
+    MPQemuLinkState *mpqemu_link;
+
+    int socket;
+
+} PCIProxyDev;
+
+typedef struct PCIProxyDevClass {
+    PCIDeviceClass parent_class;
+
+    void (*realize)(PCIProxyDev *dev, Error **errp);
+
+    char *command;
+} PCIProxyDevClass;
+
+#endif /* QEMU_PROXY_H */
diff --git a/include/io/mpqemu-link.h b/include/io/mpqemu-link.h
index d46cb81058..73cc59b874 100644
--- a/include/io/mpqemu-link.h
+++ b/include/io/mpqemu-link.h
@@ -14,6 +14,7 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 
+#include "sys/eventfd.h"
 #include "qom/object.h"
 #include "qemu/thread.h"
 #include "exec/cpu-common.h"
-- 
2.25.GIT