[PATCH v10 07/19] multi-process: Initialize message handler in remote device

[elena.ufimtseva@oracle.com]

From: Jagannathan Raman <jag.raman@oracle.com>

Initializes the message handler function in the remote process. It is
called whenever there's an event pending on QIOChannel that registers
this function.

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
---
 MAINTAINERS              |  1 +
 hw/i386/meson.build      |  1 +
 hw/i386/remote-msg.c     | 61 ++++++++++++++++++++++++++++++++++++++++
 include/hw/i386/remote.h |  9 ++++++
 4 files changed, 72 insertions(+)
 create mode 100644 hw/i386/remote-msg.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 1ca1f8ccff..9885c9499f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3047,6 +3047,7 @@ F: hw/i386/remote.c
 F: include/hw/i386/remote.h
 F: io/mpqemu-link.c
 F: include/io/mpqemu-link.h
+F: hw/i386/remote-msg.c
 
 Build and test automation
 -------------------------
diff --git a/hw/i386/meson.build b/hw/i386/meson.build
index 1c1668c5db..238ae0879d 100644
--- a/hw/i386/meson.build
+++ b/hw/i386/meson.build
@@ -24,6 +24,7 @@ i386_ss.add(when: 'CONFIG_PC', if_true: files(
   'acpi-build.c',
   'port92.c'))
 i386_ss.add(when: 'CONFIG_MPQEMU', if_true: files('remote.c'))
+i386_ss.add(when: 'CONFIG_MPQEMU', if_true: files('remote-msg.c'))
 
 subdir('kvm')
 subdir('xen')
diff --git a/hw/i386/remote-msg.c b/hw/i386/remote-msg.c
new file mode 100644
index 0000000000..83fd7bd852
--- /dev/null
+++ b/hw/i386/remote-msg.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright © 2020 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL-v2, 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 "io/channel.h"
+#include "io/mpqemu-link.h"
+#include "qapi/error.h"
+#include "sysemu/runstate.h"
+
+void coroutine_fn mpqemu_remote_msg_loop_co(void *data)
+{
+    RemoteCommDev *com = (RemoteCommDev *)data;
+    PCIDevice *pci_dev = NULL;
+
+    pci_dev = com->dev;
+    for (;;) {
+        MPQemuMsg msg = {0};
+        Error *local_err = NULL;
+
+        if (!com->ioc) {
+            error_report("ERROR: No channel available");
+            break;
+        }
+        mpqemu_msg_recv(&msg, com->ioc, &local_err);
+        if (local_err) {
+            error_report_err(local_err);
+            break;
+        }
+
+        if (!mpqemu_msg_valid(&msg)) {
+            error_report("Received invalid message from proxy"
+                         "in remote process pid=%d", getpid());
+            break;
+        }
+
+        switch (msg.cmd) {
+        default:
+            error_setg(&local_err,
+                       "Unknown command (%d) received for device %s (pid=%d)",
+                       msg.cmd, DEVICE(pci_dev)->id, getpid());
+        }
+
+        if (local_err) {
+            error_report_err(local_err);
+            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+            break;
+        }
+    }
+    qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+
+    return;
+}
diff --git a/include/hw/i386/remote.h b/include/hw/i386/remote.h
index 5b36b25ca1..e21bd5f68f 100644
--- a/include/hw/i386/remote.h
+++ b/include/hw/i386/remote.h
@@ -14,6 +14,7 @@
 #include "qom/object.h"
 #include "hw/boards.h"
 #include "hw/pci-host/remote.h"
+#include "io/channel.h"
 
 typedef struct RemoteMachineState {
     MachineState parent_obj;
@@ -21,8 +22,16 @@ typedef struct RemoteMachineState {
     RemotePCIHost *host;
 } RemoteMachineState;
 
+/* Used to pass to co-routine device and ioc. */
+typedef struct RemoteCommDev {
+    PCIDevice *dev;
+    QIOChannel *ioc;
+} RemoteCommDev;
+
 #define TYPE_REMOTE_MACHINE "remote-machine"
 #define REMOTE_MACHINE(obj) \
     OBJECT_CHECK(RemoteMachineState, (obj), TYPE_REMOTE_MACHINE)
 
+void coroutine_fn mpqemu_remote_msg_loop_co(void *data);
+
 #endif
-- 
2.25.GIT