diff --git a/hw/9pfs/9p-util-generic.c b/hw/9pfs/9p-util-generic.c
new file mode 100644
index 0000000000..4c1e9c887d
--- /dev/null
+++ b/hw/9pfs/9p-util-generic.c
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "qemu/osdep.h"
+#include "9p-util.h"
+#include <glib/gstrfuncs.h>
+
+char *qemu_open_flags_tostr(int flags)
+{
+    int acc = flags & O_ACCMODE;
+    return g_strconcat(
+        (acc == O_WRONLY) ? "WRONLY" : (acc == O_RDONLY) ? "RDONLY" : "RDWR",
+        (flags & O_CREAT) ? "|CREAT" : "",
+        (flags & O_EXCL) ? "|EXCL" : "",
+        (flags & O_NOCTTY) ? "|NOCTTY" : "",
+        (flags & O_TRUNC) ? "|TRUNC" : "",
+        (flags & O_APPEND) ? "|APPEND" : "",
+        (flags & O_NONBLOCK) ? "|NONBLOCK" : "",
+        (flags & O_DSYNC) ? "|DSYNC" : "",
+        #ifdef O_DIRECT
+        (flags & O_DIRECT) ? "|DIRECT" : "",
+        #endif
+        (flags & O_LARGEFILE) ? "|LARGEFILE" : "",
+        (flags & O_DIRECTORY) ? "|DIRECTORY" : "",
+        (flags & O_NOFOLLOW) ? "|NOFOLLOW" : "",
+        #ifdef O_NOATIME
+        (flags & O_NOATIME) ? "|NOATIME" : "",
+        #endif
+        #ifdef O_CLOEXEC
+        (flags & O_CLOEXEC) ? "|CLOEXEC" : "",
+        #endif
+        #ifdef __O_SYNC
+        (flags & __O_SYNC) ? "|SYNC" : "",
+        #else
+        ((flags & O_SYNC) == O_SYNC) ? "|SYNC" : "",
+        #endif
+        #ifdef O_PATH
+        (flags & O_PATH) ? "|PATH" : "",
+        #endif
+        #ifdef __O_TMPFILE
+        (flags & __O_TMPFILE) ? "|TMPFILE" : "",
+        #elif defined(O_TMPFILE)
+        ((flags & O_TMPFILE) == O_TMPFILE) ? "|TMPFILE" : "",
+        #endif
+        /* O_NDELAY is usually just an alias of O_NONBLOCK */
+        #if defined(O_NDELAY) && O_NDELAY != O_NONBLOCK
+        (flags & O_NDELAY) ? "|NDELAY" : "",
+        #endif
+        NULL /* always last (required NULL termination) */
+    );
+}
diff --git a/hw/9pfs/9p-util.h b/hw/9pfs/9p-util.h
index 51c94b0116..a24d572407 100644
--- a/hw/9pfs/9p-util.h
+++ b/hw/9pfs/9p-util.h
@@ -260,4 +260,10 @@ int pthread_fchdir_np(int fd) __attribute__((weak_import));
 #endif
 int qemu_mknodat(int dirfd, const char *filename, mode_t mode, dev_t dev);
 
+/*
+ * Returns a newly allocated string presentation of open() flags, intended
+ * for debugging (tracing) purposes only.
+ */
+char *qemu_open_flags_tostr(int flags);
+
 #endif
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 6f24c1abb3..7cad2bce62 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -2008,6 +2008,7 @@ static void coroutine_fn v9fs_open(void *opaque)
     V9fsFidState *fidp;
     V9fsPDU *pdu = opaque;
     V9fsState *s = pdu->s;
+    g_autofree char *trace_oflags = NULL;
 
     if (s->proto_version == V9FS_PROTO_2000L) {
         err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode);
@@ -2019,7 +2020,13 @@ static void coroutine_fn v9fs_open(void *opaque)
     if (err < 0) {
         goto out_nofid;
     }
-    trace_v9fs_open(pdu->tag, pdu->id, fid, mode);
+    if (trace_event_get_state_backends(TRACE_V9FS_OPEN)) {
+        trace_oflags = qemu_open_flags_tostr(
+            (s->proto_version == V9FS_PROTO_2000L) ?
+                dotl_to_open_flags(mode) : omode_to_uflags(mode)
+        );
+        trace_v9fs_open(pdu->tag, pdu->id, fid, mode, trace_oflags);
+    }
 
     fidp = get_fid(pdu, fid);
     if (fidp == NULL) {
diff --git a/hw/9pfs/meson.build b/hw/9pfs/meson.build
index eceffdb81e..d35d4f44ff 100644
--- a/hw/9pfs/meson.build
+++ b/hw/9pfs/meson.build
@@ -3,6 +3,7 @@ fs_ss.add(files(
   '9p-local.c',
   '9p-posix-acl.c',
   '9p-synth.c',
+  '9p-util-generic.c',
   '9p-xattr-user.c',
   '9p-xattr.c',
   '9p.c',
diff --git a/hw/9pfs/trace-events b/hw/9pfs/trace-events
index ed9f4e7209..0e0fc37261 100644
--- a/hw/9pfs/trace-events
+++ b/hw/9pfs/trace-events
@@ -13,7 +13,7 @@ v9fs_getattr(uint16_t tag, uint8_t id, int32_t fid, uint64_t request_mask) "tag
 v9fs_getattr_return(uint16_t tag, uint8_t id, uint64_t result_mask, uint32_t mode, uint32_t uid, uint32_t gid) "tag %d id %d getattr={result_mask %"PRId64" mode %u uid %u gid %u}"
 v9fs_walk(uint16_t tag, uint8_t id, int32_t fid, int32_t newfid, uint16_t nwnames, const char* wnames) "tag=%d id=%d fid=%d newfid=%d nwnames=%d wnames={%s}"
 v9fs_walk_return(uint16_t tag, uint8_t id, uint16_t nwnames, void* qids) "tag %d id %d nwnames %d qids %p"
-v9fs_open(uint16_t tag, uint8_t id, int32_t fid, int32_t mode) "tag %d id %d fid %d mode %d"
+v9fs_open(uint16_t tag, uint8_t id, int32_t fid, int32_t mode, const char* oflags) "tag=%d id=%d fid=%d mode=%d(%s)"
 v9fs_open_return(uint16_t tag, uint8_t id, uint8_t type, uint32_t version, uint64_t path, int iounit) "tag %u id %u qid={type %u version %u path %"PRIu64"} iounit %d"
 v9fs_lcreate(uint16_t tag, uint8_t id, int32_t dfid, int32_t flags, int32_t mode, uint32_t gid) "tag %d id %d dfid %d flags %d mode %d gid %u"
 v9fs_lcreate_return(uint16_t tag, uint8_t id, uint8_t type, uint32_t version, uint64_t path, int32_t iounit) "tag %u id %u qid={type %u version %u path %"PRIu64"} iounit %d"
