tools: acrnctl: Add support for continuing vm

Add command continue to start vm from pause state.

Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Reviewed-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
Reviewed-by: Yan, Like <like.yan@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

tools/acrn-manager/README.rst

@@ -28,6 +28,7 @@ You can see the available ``acrnctl`` commands by running:
      del
      add
      pause
+     continue
    Use acrnctl [cmd] help for details
 
 Here are some usage examples:

tools/acrn-manager/acrn_vm_ops.c

@@ -220,3 +220,23 @@ int pause_vm(char *vmname)
 
 	return ack.err;
 }
+
+int continue_vm(char *vmname)
+{
+	struct req_dm_continue req;
+	struct ack_dm_continue ack;
+
+	req.msg.magic = MNGR_MSG_MAGIC;
+	req.msg.msgid = DM_CONTINUE;
+	req.msg.timestamp = time(NULL);
+	req.msg.len = sizeof(req);
+
+	send_msg(vmname, (struct mngr_msg *)&req,
+			(struct mngr_msg *)&ack, sizeof(ack));
+
+	if (ack.err) {
+		printf("Unable to continue vm. errno(%d)\n", ack.err);
+	}
+
+	return ack.err;
+}

tools/acrn-manager/acrnctl.c

@@ -33,6 +33,7 @@
 #define DEL_DESC       "Delete virtual machine VM_NAME"
 #define ADD_DESC       "Add one virtual machine with SCRIPTS and OPTIONS"
 #define PAUSE_DESC     "Block all vCPUs of virtual machine VM_NAME"
+#define CONTINUE_DESC  "Start virtual machine from pause state"
 
 struct acrnctl_cmd {
 	const char *cmd;
@@ -404,6 +405,35 @@ static int acrnctl_do_pause(int argc, char *argv[])
 	return 0;
 }
 
+static int acrnctl_do_continue(int argc, char *argv[])
+{
+	struct vmmngr_struct *s;
+	int i;
+
+	for (i = 1; i < argc; i++) {
+		s = vmmngr_find(argv[i]);
+		if (!s) {
+			printf("Can't find vm %s\n", argv[i]);
+			continue;
+		}
+
+		/* Per current implemention, we can't know if vm is in paused
+		   state. Send continue cmd to acrn-dm when VM_STARTED and will
+		   correct it later when we have a way to check if vm has been
+		   paused */
+		switch (s->state) {
+			case VM_STARTED:
+				continue_vm(argv[i]);
+				break;
+			default:
+				printf("%s current state %s, can't continue\n",
+					argv[i], state_str[s->state]);
+		}
+	}
+
+	return 0;
+}
+
 /* Default args validation function */
 int df_valid_args(struct acrnctl_cmd *cmd, int argc, char *argv[])
 {
@@ -458,6 +488,7 @@ struct acrnctl_cmd acmds[] = {
 	ACMD("del", acrnctl_do_del, DEL_DESC, df_valid_args),
 	ACMD("add", acrnctl_do_add, ADD_DESC, valid_add_args),
 	ACMD("pause", acrnctl_do_pause, PAUSE_DESC, df_valid_args),
+	ACMD("continue", acrnctl_do_continue, CONTINUE_DESC, df_valid_args),
 };
 
 #define NCMD	(sizeof(acmds)/sizeof(struct acrnctl_cmd))

tools/acrn-manager/acrnctl.h

@@ -60,5 +60,6 @@ int list_vm(void);
 int stop_vm(char *vmname);
 int start_vm(char *vmname);
 int pause_vm(char *vmname);
+int continue_vm(char *vmname);
 
 #endif				/* _ACRNCTL_H_ */