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[PATCH v12 09/19] multi-process: Initialize message handler in remote de


From: Jagannathan Raman
Subject: [PATCH v12 09/19] multi-process: Initialize message handler in remote device
Date: Tue, 1 Dec 2020 15:22:44 -0500

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>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 include/hw/remote/machine.h |  9 +++++++
 hw/remote/message.c         | 61 +++++++++++++++++++++++++++++++++++++++++++++
 MAINTAINERS                 |  1 +
 hw/remote/meson.build       |  1 +
 4 files changed, 72 insertions(+)
 create mode 100644 hw/remote/message.c

diff --git a/include/hw/remote/machine.h b/include/hw/remote/machine.h
index d312972..3073db6 100644
--- a/include/hw/remote/machine.h
+++ b/include/hw/remote/machine.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 "x-remote-machine"
 #define REMOTE_MACHINE(obj) \
     OBJECT_CHECK(RemoteMachineState, (obj), TYPE_REMOTE_MACHINE)
 
+void coroutine_fn mpqemu_remote_msg_loop_co(void *data);
+
 #endif
diff --git a/hw/remote/message.c b/hw/remote/message.c
new file mode 100644
index 0000000..5d87bf4
--- /dev/null
+++ b/hw/remote/message.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/remote/machine.h"
+#include "io/channel.h"
+#include "hw/remote/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/MAINTAINERS b/MAINTAINERS
index d0c891a..b64e4b8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3143,6 +3143,7 @@ F: hw/remote/machine.c
 F: include/hw/remote/machine.h
 F: hw/remote/mpqemu-link.c
 F: include/hw/remote/mpqemu-link.h
+F: hw/remote/message.c
 
 Build and test automation
 -------------------------
diff --git a/hw/remote/meson.build b/hw/remote/meson.build
index a2b2fc0..9f5c57f 100644
--- a/hw/remote/meson.build
+++ b/hw/remote/meson.build
@@ -2,5 +2,6 @@ remote_ss = ss.source_set()
 
 remote_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('machine.c'))
 remote_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('mpqemu-link.c'))
+remote_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('message.c'))
 
 softmmu_ss.add_all(when: 'CONFIG_MULTIPROCESS', if_true: remote_ss)
-- 
1.8.3.1




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