[PATCH RESEND v6 16/36] multi-process: remote process initialization

[elena . ufimtseva]

From: Jagannathan Raman <address@hidden>

Adds the handler to process message from QEMU,
Initialize remote process main loop, handles SYNC_SYSMEM
message by updating its "system_memory" container using
shared file descriptors received from QEMU.

Signed-off-by: John G Johnson <address@hidden>
Signed-off-by: Elena Ufimtseva <address@hidden>
Signed-off-by: Jagannathan Raman <address@hidden>
---
 MAINTAINERS            |   1 +
 remote/remote-common.h |  21 +++++++++
 remote/remote-main.c   | 104 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 126 insertions(+)
 create mode 100644 remote/remote-common.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 98237fff62..96f8d7ff19 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2857,6 +2857,7 @@ M: John G Johnson <address@hidden>
 S: Maintained
 F: remote/Makefile.objs
 F: remote/remote-main.c
+F: remote/remote-common.h
 F: include/io/mpqemu-link.h
 F: io/mpqemu-link.c
 F: include/remote/pcihost.h
diff --git a/remote/remote-common.h b/remote/remote-common.h
new file mode 100644
index 0000000000..12c8d066cf
--- /dev/null
+++ b/remote/remote-common.h
@@ -0,0 +1,21 @@
+/*
+ * Remote device initialization
+ *
+ * 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 REMOTE_COMMON_H
+#define REMOTE_COMMON_H
+
+extern const char *__progname;
+
+#define PROC_INFO_LENGTH 1024
+gchar *print_pid_exec(gchar *str);
+
+#endif /* REMOTE_COMMON_H */
+
+
+
diff --git a/remote/remote-main.c b/remote/remote-main.c
index ecf30e0cba..dbd6ad2529 100644
--- a/remote/remote-main.c
+++ b/remote/remote-main.c
@@ -12,6 +12,7 @@
 #include "qemu-common.h"
 
 #include <stdio.h>
+#include <unistd.h>
 
 #include "qemu/module.h"
 #include "remote/pcihost.h"
@@ -19,12 +20,115 @@
 #include "hw/boards.h"
 #include "hw/qdev-core.h"
 #include "qemu/main-loop.h"
+#include "remote/memory.h"
+#include "io/mpqemu-link.h"
+#include "qapi/error.h"
+#include "qemu/main-loop.h"
+#include "sysemu/cpus.h"
+#include "qemu-common.h"
+#include "hw/pci/pci.h"
+#include "qemu/thread.h"
+#include "qemu/main-loop.h"
+#include "qemu/config-file.h"
+#include "sysemu/sysemu.h"
+#include "block/block.h"
+#include "exec/ramlist.h"
+#include "remote/remote-common.h"
+
+static MPQemuLinkState *mpqemu_link;
+
+gchar *print_pid_exec(gchar *str)
+{
+    if (!str) {
+        return NULL;
+    }
+    memset(str, 0, PROC_INFO_LENGTH);
+    g_snprintf(str, PROC_INFO_LENGTH, "pid %d, exec name %s ",
+                                       getpid(), __progname);
+    return str;
+}
+
+static void process_msg(GIOCondition cond, MPQemuLinkState *link,
+                        MPQemuChannel *chan)
+{
+    MPQemuMsg *msg = NULL;
+    Error *err = NULL;
+    g_autofree gchar *pid_exec = NULL;
+
+    pid_exec = g_malloc(PROC_INFO_LENGTH);
+
+    if ((cond & G_IO_HUP) || (cond & G_IO_ERR)) {
+        goto finalize_loop;
+    }
+
+    msg = g_malloc0(sizeof(MPQemuMsg));
+
+    if (mpqemu_msg_recv(msg, chan) < 0) {
+        error_setg(&err, "Failed to receive message in remote process %s",
+                   print_pid_exec(pid_exec));
+        goto finalize_loop;
+    }
+
+    switch (msg->cmd) {
+    case INIT:
+        break;
+    default:
+        error_setg(&err, "Unknown command in %s", print_pid_exec(pid_exec));
+        goto finalize_loop;
+    }
+
+    g_free(msg->data2);
+    g_free(msg);
+
+    return;
+
+finalize_loop:
+    if (err) {
+        error_report_err(err);
+    }
+    g_free(msg);
+    mpqemu_link_finalize(mpqemu_link);
+    mpqemu_link = NULL;
+}
 
 int main(int argc, char *argv[])
 {
+    Error *err = NULL;
+
     module_call_init(MODULE_INIT_QOM);
 
+    bdrv_init_with_whitelist();
+
+    if (qemu_init_main_loop(&err)) {
+        error_report_err(err);
+        return -EBUSY;
+    }
+
+    qemu_init_cpu_loop();
+
+    page_size_init();
+
+    qemu_mutex_init(&ram_list.mutex);
+
     current_machine = MACHINE(REMOTE_MACHINE(object_new(TYPE_REMOTE_MACHINE)));
 
+    mpqemu_link = mpqemu_link_create();
+    if (!mpqemu_link) {
+        printf("Could not create MPQemu link pid %d, exec_name %s",
+               getpid(), __progname);
+        return -1;
+    }
+
+    mpqemu_init_channel(mpqemu_link, &mpqemu_link->com, STDIN_FILENO);
+
+    mpqemu_link_set_callback(mpqemu_link, process_msg);
+
+    qdev_machine_creation_done();
+    qemu_mutex_lock_iothread();
+    qemu_run_machine_init_done_notifiers();
+    qemu_mutex_unlock_iothread();
+
+    mpqemu_start_coms(mpqemu_link, mpqemu_link->com);
+
     return 0;
 }
-- 
2.25.GIT