Revert stubdom+xenstore 9pfs changes

to unblock CI.  It turns out there are still issues in some configurations.

https://gitlab.com/xen-project/xen/-/pipelines/1188660609

This reverts commit f5e1c527d0.
This reverts commit a76f8809f1.
This reverts commit 93892648ff.
This reverts commit 297a2587e6.
This reverts commit 0b761781c4.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>

stubdom/xenstore-minios.cfg

@@ -3,7 +3,7 @@ CONFIG_NETFRONT=n
 CONFIG_FBFRONT=n
 CONFIG_KBDFRONT=n
 CONFIG_CONSFRONT=n
+CONFIG_XENBUS=n
 CONFIG_LWIP=n
-CONFIG_9PFRONT=y
 CONFIG_BALLOON=y
 XEN_INTERFACE_VERSION=__XEN_LATEST_INTERFACE_VERSION__

stubdom/xenstorepvh-minios.cfg

@@ -4,7 +4,7 @@ CONFIG_NETFRONT=n
 CONFIG_FBFRONT=n
 CONFIG_KBDFRONT=n
 CONFIG_CONSFRONT=n
+CONFIG_XENBUS=n
 CONFIG_LWIP=n
-CONFIG_9PFRONT=y
 CONFIG_BALLOON=y
 XEN_INTERFACE_VERSION=__XEN_LATEST_INTERFACE_VERSION__

tools/hotplug/Linux/init.d/sysconfig.xencommons.in

@@ -58,6 +58,7 @@ XENSTORED_ARGS=
 ## Default: Not defined, tracing off
 #
 # Log xenstored messages
+# Only evaluated if XENSTORETYPE is "daemon".
 #XENSTORED_TRACE=[yes|on|1]
 
 ## Type: integer

tools/hotplug/Linux/launch-xenstore.in

@@ -98,7 +98,6 @@ test -f @CONFIG_DIR@/@CONFIG_LEAF_DIR@/xencommons && . @CONFIG_DIR@/@CONFIG_LEAF
 	[ -z "$XENSTORE_DOMAIN_SIZE" ] && XENSTORE_DOMAIN_SIZE=8
 	XENSTORE_DOMAIN_ARGS="$XENSTORE_DOMAIN_ARGS --memory $XENSTORE_DOMAIN_SIZE"
 	[ -z "$XENSTORE_MAX_DOMAIN_SIZE" ] || XENSTORE_DOMAIN_ARGS="$XENSTORE_DOMAIN_ARGS --maxmem $XENSTORE_MAX_DOMAIN_SIZE"
-	[ -z "$XENSTORED_TRACE" ] || XENSTORE_DOMAIN_ARGS="$XENSTORE_DOMAIN_ARGS -T xenstored-trace.log"
 
 	echo -n Starting $XENSTORE_DOMAIN_KERNEL...
 	${LIBEXEC_BIN}/init-xenstore-domain $XENSTORE_DOMAIN_ARGS || exit 1

tools/xenstored/control.c

@@ -201,6 +201,19 @@ static int do_control_quota_s(const void *ctx, struct connection *conn,
 	return EINVAL;
 }
 
+#ifdef __MINIOS__
+static int do_control_memreport(const void *ctx, struct connection *conn,
+				const char **vec, int num)
+{
+	if (num)
+		return EINVAL;
+
+	talloc_report_full(NULL, stdout);
+
+	send_ack(conn, XS_CONTROL);
+	return 0;
+}
+#else
 static int do_control_logfile(const void *ctx, struct connection *conn,
 			      const char **vec, int num)
 {
@@ -209,7 +222,7 @@ static int do_control_logfile(const void *ctx, struct connection *conn,
 
 	close_log();
 	talloc_free(tracefile);
-	tracefile = absolute_filename(NULL, vec[0]);
+	tracefile = talloc_strdup(NULL, vec[0]);
 	reopen_log();
 
 	send_ack(conn, XS_CONTROL);
@@ -220,7 +233,6 @@ static int do_control_memreport(const void *ctx, struct connection *conn,
 				const char **vec, int num)
 {
 	FILE *fp;
-	const char *filename;
 	int fd;
 
 	if (num > 1)
@@ -243,12 +255,8 @@ static int do_control_memreport(const void *ctx, struct connection *conn,
 			if (!fp)
 				close(fd);
 		}
-	} else {
-		filename = absolute_filename(ctx, vec[0]);
-		if (!filename)
-			return ENOMEM;
-		fp = fopen(filename, "a");
-	}
+	} else
+		fp = fopen(vec[0], "a");
 
 	if (!fp)
 		return EBADF;
@@ -259,6 +267,7 @@ static int do_control_memreport(const void *ctx, struct connection *conn,
 	send_ack(conn, XS_CONTROL);
 	return 0;
 }
+#endif
 
 static int do_control_print(const void *ctx, struct connection *conn,
 			    const char **vec, int num)
@@ -300,8 +309,12 @@ static struct cmd_s cmds[] = {
 		"[-c <cmdline>] [-F] [-t <timeout>] <file>\n"
 		"    Default timeout is 60 seconds.", 5 },
 #endif
+#ifdef __MINIOS__
+	{ "memreport", do_control_memreport, "" },
+#else
 	{ "logfile", do_control_logfile, "<file>" },
 	{ "memreport", do_control_memreport, "[<file>]" },
+#endif
 	{ "print", do_control_print, "<string>" },
 	{ "quota", do_control_quota,
 		"[set <name> <val>|<domid>|max [-r]]" },

tools/xenstored/core.c

@@ -63,7 +63,7 @@ char **orig_argv;
 LIST_HEAD(connections);
 int tracefd = -1;
 bool keep_orphans = false;
-const char *tracefile = NULL;
+char *tracefile = NULL;
 static struct hashtable *nodes;
 unsigned int trace_flags = TRACE_OBJ | TRACE_IO;
 
@@ -137,17 +137,6 @@ void trace_destroy(const void *data, const char *type)
 		trace("obj: DESTROY %s %p\n", type, data);
 }
 
-/*
- * Return an absolute filename.
- * In case of a relative filename given as input, prepend XENSTORE_LIB_DIR.
- */
-const char *absolute_filename(const void *ctx, const char *filename)
-{
-	if (filename[0] != '/')
-		return talloc_asprintf(ctx, XENSTORE_LIB_DIR "/%s", filename);
-	return talloc_strdup(ctx, filename);
-}
-
 void close_log(void)
 {
 	if (tracefd >= 0)
@@ -2770,7 +2759,7 @@ int main(int argc, char *argv[])
 #endif
 
 	if (tracefile)
-		tracefile = absolute_filename(NULL, tracefile);
+		tracefile = talloc_strdup(NULL, tracefile);
 
 #ifndef NO_LIVE_UPDATE
 	/* Read state in case of live update. */

tools/xenstored/core.h

@@ -36,8 +36,6 @@
 #include "list.h"
 #include "hashtable.h"
 
-#define XENSTORE_LIB_DIR	XEN_LIB_DIR "/xenstore"
-
 #ifndef O_CLOEXEC
 #define O_CLOEXEC 0
 /* O_CLOEXEC support is needed for Live Update in the daemon case. */
@@ -341,7 +339,7 @@ void close_log(void);
 extern int orig_argc;
 extern char **orig_argv;
 
-extern const char *tracefile;
+extern char *tracefile;
 extern int tracefd;
 
 /* Trace flag values must be kept in sync with trace_switches[] contents. */
@@ -401,13 +399,6 @@ void handle_special_fds(void);
 int get_socket_fd(void);
 void set_socket_fd(int fd);
 
-#ifdef __MINIOS__
-void mount_9pfs(void);
-#endif
-
-const char *xenstore_rundir(void);
-const char *absolute_filename(const void *ctx, const char *filename);
-
 /* Close stdin/stdout/stderr to complete daemonize */
 void finish_daemonize(void);
 

tools/xenstored/domain.c

@@ -1236,8 +1236,6 @@ void stubdom_init(void)
 		barf_perror("Failed to initialize stubdom");
 
 	xenevtchn_notify(xce_handle, stubdom->port);
-
-	mount_9pfs();
 #endif
 }
 

tools/xenstored/lu_daemon.c

@@ -24,7 +24,7 @@ void lu_get_dump_state(struct lu_dump_state *state)
 	state->size = 0;
 
 	state->filename = talloc_asprintf(NULL, "%s/state_dump",
-					  xenstore_rundir());
+					  xenstore_daemon_rundir());
 	if (!state->filename)
 		barf("Allocation failure");
 
@@ -65,7 +65,7 @@ FILE *lu_dump_open(const void *ctx)
 	int fd;
 
 	filename = talloc_asprintf(ctx, "%s/state_dump",
-				   xenstore_rundir());
+				   xenstore_daemon_rundir());
 	if (!filename)
 		return NULL;
 

tools/xenstored/minios.c

@@ -17,20 +17,10 @@
 */
 #include <sys/types.h>
 #include <sys/mman.h>
-#include <syslog.h>
-#include "talloc.h"
 #include "core.h"
 #include "utils.h"
 #include <xen/grant_table.h>
 #include <mini-os/lib.h>
-#include <mini-os/9pfront.h>
-#include <mini-os/sched.h>
-#include <mini-os/xenbus.h>
-#include <mini-os/xmalloc.h>
-
-#define P9_STATE_PATH	"device/9pfs/0/state"
-
-static void *p9_device;
 
 void finish_daemonize(void)
 {
@@ -84,55 +74,3 @@ int get_socket_fd(void)
 void set_socket_fd(int fd)
 {
 }
-
-static void mount_thread(void *p)
-{
-	xenbus_event_queue events = NULL;
-	char *err;
-	char *dummy;
-
-	err = xenbus_watch_path_token(XBT_NIL, P9_STATE_PATH, "9pfs", &events);
-	if (err) {
-		log("error \"%s\" when setting watch on \"%s\"\n", err,
-		    P9_STATE_PATH);
-		free(err);
-		return;
-	}
-
-	for (;;) {
-		xenbus_wait_for_watch(&events);
-
-		/*
-		 * We only care for existence of the state node.
-		 * State changes are handled in init_9pfront().
-		 */
-		err = xenbus_read(XBT_NIL, P9_STATE_PATH, &dummy);
-		if (!err)
-			break;
-		free(err);
-	}
-
-	free(dummy);
-
-	err = xenbus_unwatch_path_token(XBT_NIL, P9_STATE_PATH, "9pfs");
-	if (err) {
-		log("error \"%s\" when unwatching \"%s\", leaking watch\n",
-		    err, P9_STATE_PATH);
-		free(err);
-	}
-
-	p9_device = init_9pfront(0, XENSTORE_LIB_DIR);
-
-	/* Start logging if selected. */
-	reopen_log();
-}
-
-void mount_9pfs(void)
-{
-	create_thread("mount-9pfs", mount_thread, NULL);
-}
-
-const char *xenstore_rundir(void)
-{
-	return XENSTORE_LIB_DIR;
-}

tools/xenstored/posix.c

@@ -326,10 +326,9 @@ void early_init(bool live_update, bool dofork, const char *pidfile)
 {
 	reopen_log();
 
-	/* Make sure xenstored directories exist. */
+	/* Make sure xenstored directory exists. */
 	/* Errors ignored here, will be reported when we open files */
 	mkdir(xenstore_daemon_rundir(), 0755);
-	mkdir(XENSTORE_LIB_DIR, 0755);
 
 	if (dofork) {
 		openlog("xenstored", 0, LOG_DAEMON);
@@ -407,8 +406,3 @@ void set_socket_fd(int fd)
 {
 	sock = fd;
 }
-
-const char *xenstore_rundir(void)
-{
-	return xenstore_daemon_rundir();
-}