[PATCH v7 09/21] multi-process: Initialize message handler in remote device

[elena . ufimtseva]

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/Makefile.objs    |  1 +
 hw/i386/remote-msg.c     | 52 ++++++++++++++++++++++++++++++++++++++++
 hw/i386/remote.c         |  4 ++++
 include/hw/i386/remote.h |  3 +++
 5 files changed, 61 insertions(+)
 create mode 100644 hw/i386/remote-msg.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 50a5fc53d6..e204b3e0c6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2949,6 +2949,7 @@ 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/Makefile.objs b/hw/i386/Makefile.objs
index 5ead266a15..83969585c1 100644
--- a/hw/i386/Makefile.objs
+++ b/hw/i386/Makefile.objs
@@ -15,6 +15,7 @@ obj-$(CONFIG_VMPORT) += vmport.o
 obj-$(CONFIG_VMMOUSE) += vmmouse.o
 obj-$(CONFIG_PC) += port92.o
 obj-$(CONFIG_MPQEMU) += remote.o
+obj-$(CONFIG_MPQEMU) += remote-msg.o
 
 obj-y += kvmvapic.o
 obj-$(CONFIG_ACPI) += acpi-common.o
diff --git a/hw/i386/remote-msg.c b/hw/i386/remote-msg.c
new file mode 100644
index 0000000000..58e24ab2ad
--- /dev/null
+++ b/hw/i386/remote-msg.c
@@ -0,0 +1,52 @@
+#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"
+
+gboolean mpqemu_process_msg(QIOChannel *ioc, GIOCondition cond,
+                            gpointer opaque)
+{
+    Error *local_err = NULL;
+    MPQemuMsg msg = { 0 };
+
+    if (cond & G_IO_HUP) {
+        qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+    }
+
+    if (cond & (G_IO_ERR | G_IO_NVAL)) {
+        error_setg(&local_err, "Error %d while processing message from proxy \
+                   in remote process pid=%d", errno, getpid());
+        return FALSE;
+    }
+
+    if (mpqemu_msg_recv(&msg, ioc) < 0) {
+        return FALSE;
+    }
+
+    if (!mpqemu_msg_valid(&msg)) {
+        error_report("Received invalid message from proxy \
+                     in remote process pid=%d", getpid());
+        return TRUE;
+    }
+
+    switch (msg.cmd) {
+    default:
+        error_setg(&local_err, "Unknown command (%d) received from proxy \
+                   in remote process pid=%d", msg.cmd, getpid());
+    }
+
+    if (msg.data2) {
+        free(msg.data2);
+    }
+
+    if (local_err) {
+        error_report_err(local_err);
+        return FALSE;
+    }
+
+    return TRUE;
+}
diff --git a/hw/i386/remote.c b/hw/i386/remote.c
index 1a1becffe0..5342e884ad 100644
--- a/hw/i386/remote.c
+++ b/hw/i386/remote.c
@@ -16,6 +16,7 @@
 #include "exec/memory.h"
 #include "qapi/error.h"
 #include "io/channel-util.h"
+#include "io/channel.h"
 
 static void remote_machine_init(MachineState *machine)
 {
@@ -50,6 +51,9 @@ static void remote_set_socket(Object *obj, const char *str, 
Error **errp)
     int fd = atoi(str);
 
     s->ioc = qio_channel_new_fd(fd, &local_err);
+
+    qio_channel_add_watch(s->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
+                          mpqemu_process_msg, NULL, NULL);
 }
 
 static void remote_instance_init(Object *obj)
diff --git a/include/hw/i386/remote.h b/include/hw/i386/remote.h
index 0f8b861e7a..c3890e57ab 100644
--- a/include/hw/i386/remote.h
+++ b/include/hw/i386/remote.h
@@ -30,4 +30,7 @@ typedef struct RemMachineState {
 #define REMOTE_MACHINE(obj) \
     OBJECT_CHECK(RemMachineState, (obj), TYPE_REMOTE_MACHINE)
 
+gboolean mpqemu_process_msg(QIOChannel *ioc, GIOCondition cond,
+                            gpointer opaque);
+
 #endif
-- 
2.25.GIT