tools/xenstored: make stubdom_init() live update aware

Pass the live_update bool to stubdom_init() in order to be able to
handle it properly under Mini-OS.

As stubdom_init() will (re-)create the 9pfs device needed for
reading the saved state, call stubdom_init() before lu_read_state().

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>

tools/xenstored/core.c

@@ -2774,14 +2774,14 @@ int main(int argc, char *argv[])
 	if (tracefile)
 		tracefile = absolute_filename(NULL, tracefile);
 
+	stubdom_init(live_update);
+
 #ifndef NO_LIVE_UPDATE
 	/* Read state in case of live update. */
 	if (live_update)
 		lu_read_state();
 #endif
 
-	stubdom_init();
-
 	check_store();
 
 	/* Get ready to listen to the tools. */

tools/xenstored/core.h

@@ -412,7 +412,7 @@ xenevtchn_handle *evtchn_fdopen(int fd);
 int evtchn_rebind(int port);
 
 #ifdef __MINIOS__
-void mount_9pfs(void);
+void mount_9pfs(bool live_update);
 #endif
 
 const char *xenstore_rundir(void);

tools/xenstored/domain.c

@@ -1337,7 +1337,7 @@ void dom0_init(void)
 	xenevtchn_notify(xce_handle, dom0->port);
 }
 
-void stubdom_init(void)
+void stubdom_init(bool live_update)
 {
 #ifdef __MINIOS__
 	struct domain *stubdom;
@@ -1345,13 +1345,16 @@ void stubdom_init(void)
 	if (stub_domid < 0)
 		return;
 
-	stubdom = introduce_domain(NULL, stub_domid, xenbus_evtchn, false);
-	if (!stubdom)
-		barf_perror("Failed to initialize stubdom");
+	if (!live_update) {
+		stubdom = introduce_domain(NULL, stub_domid, xenbus_evtchn,
+					   false);
+		if (!stubdom)
+			barf_perror("Failed to initialize stubdom");
 
-	xenevtchn_notify(xce_handle, stubdom->port);
+		xenevtchn_notify(xce_handle, stubdom->port);
+	}
 
-	mount_9pfs();
+	mount_9pfs(live_update);
 #endif
 }
 

tools/xenstored/domain.h

@@ -93,7 +93,7 @@ int do_set_feature(const void *ctx, struct connection *conn,
 void domain_early_init(void);
 void domain_init(int evtfd);
 void dom0_init(void);
-void stubdom_init(void);
+void stubdom_init(bool live_update);
 void domain_deinit(void);
 void ignore_connection(struct connection *conn, unsigned int err);
 

tools/xenstored/minios.c

@@ -131,15 +131,21 @@ static void mount_thread(void *p)
 		free(err);
 	}
 
-	p9_device = init_9pfront(0, XENSTORE_LIB_DIR);
+	p9_device = init_9pfront2(0, XENSTORE_LIB_DIR, INIT9P_FLAG_KEXEC);
 
 	/* Start logging if selected. */
 	reopen_log();
 }
 
-void mount_9pfs(void)
+void mount_9pfs(bool live_update)
 {
-	create_thread("mount-9pfs", mount_thread, NULL);
+	if (!live_update)
+		create_thread("mount-9pfs", mount_thread, NULL);
+	else {
+		p9_device = init_9pfront2(0, XENSTORE_LIB_DIR,
+					  INIT9P_FLAG_REINIT);
+		reopen_log();
+	}
 }
 
 const char *xenstore_rundir(void)