tools: acrnctl: Add support for resuming vm

Add command resume to resume vm from suspend 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

@@ -30,6 +30,7 @@ You can see the available ``acrnctl`` commands by running:
      pause
      continue
      suspend
+     resume
    Use acrnctl [cmd] help for details
 
 Here are some usage examples:

tools/acrn-manager/acrn_vm_ops.c

@@ -260,3 +260,23 @@ int suspend_vm(char *vmname)
 
 	return ack.err;
 }
+
+int resume_vm(char *vmname)
+{
+	struct req_dm_resume req;
+	struct ack_dm_resume ack;
+
+	req.msg.magic = MNGR_MSG_MAGIC;
+	req.msg.msgid = DM_RESUME;
+	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 resume vm. errno(%d)\n", ack.err);
+	}
+
+	return ack.err;
+}

tools/acrn-manager/acrnctl.c

@@ -35,6 +35,7 @@
 #define PAUSE_DESC     "Block all vCPUs of virtual machine VM_NAME"
 #define CONTINUE_DESC  "Start virtual machine from pause state"
 #define SUSPEND_DESC   "Switch virtual machine to suspend state"
+#define RESUME_DESC    "Resume virtual machine from suspend state"
 
 struct acrnctl_cmd {
 	const char *cmd;
@@ -461,6 +462,35 @@ static int acrnctl_do_suspend(int argc, char *argv[])
 	return 0;
 }
 
+static int acrnctl_do_resume(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 suspended
+		   state. Send reume cmd to acrn-dm when VM_STARTED and will
+		   correct it later when we have a way to check if vm has been
+		   suspended */
+		switch (s->state) {
+			case VM_STARTED:
+				resume_vm(argv[i]);
+				break;
+			default:
+				printf("%s current state %s, can't resume\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[])
 {
@@ -517,6 +547,7 @@ struct acrnctl_cmd acmds[] = {
 	ACMD("pause", acrnctl_do_pause, PAUSE_DESC, df_valid_args),
 	ACMD("continue", acrnctl_do_continue, CONTINUE_DESC, df_valid_args),
 	ACMD("suspend", acrnctl_do_suspend, SUSPEND_DESC, df_valid_args),
+	ACMD("resume", acrnctl_do_resume, RESUME_DESC, df_valid_args),
 };
 
 #define NCMD	(sizeof(acmds)/sizeof(struct acrnctl_cmd))

tools/acrn-manager/acrnctl.h

@@ -62,5 +62,6 @@ int start_vm(char *vmname);
 int pause_vm(char *vmname);
 int continue_vm(char *vmname);
 int suspend_vm(char *vmname);
+int resume_vm(char *vmname);
 
 #endif				/* _ACRNCTL_H_ */