--- /dev/null
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Sam Li <faithilikerun@gmail.com>
+Date: Sat, 24 Sep 2022 22:48:15 +0800
+Subject: [PATCH] block/io_uring: revert "Use io_uring_register_ring_fd() to
+ skip fd operations"
+
+Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1193
+
+The commit "Use io_uring_register_ring_fd() to skip fd operations" broke
+when booting a guest with iothread and io_uring. That is because the
+io_uring_register_ring_fd() call is made from the main thread instead of
+IOThread where io_uring_submit() is called. It can not be guaranteed
+to register the ring fd in the correct thread or unregister the same ring
+fd if the IOThread is disabled. This optimization is not critical so we
+will revert previous commit.
+
+This reverts commit e2848bc574fe2715c694bf8fe9a1ba7f78a1125a
+and 77e3f038af1764983087e3551a0fde9951952c4d.
+
+Signed-off-by: Sam Li <faithilikerun@gmail.com>
+---
+ block/io_uring.c | 13 +------------
+ meson.build | 1 -
+ 2 files changed, 1 insertion(+), 13 deletions(-)
+
+diff --git a/block/io_uring.c b/block/io_uring.c
+index a1760152e0..973e15d876 100644
+--- a/block/io_uring.c
++++ b/block/io_uring.c
+@@ -11,7 +11,6 @@
+ #include "qemu/osdep.h"
+ #include <liburing.h>
+ #include "block/aio.h"
+-#include "qemu/error-report.h"
+ #include "qemu/queue.h"
+ #include "block/block.h"
+ #include "block/raw-aio.h"
+@@ -19,7 +18,6 @@
+ #include "qapi/error.h"
+ #include "trace.h"
+
+-
+ /* io_uring ring size */
+ #define MAX_ENTRIES 128
+
+@@ -432,17 +430,8 @@ LuringState *luring_init(Error **errp)
+ }
+
+ ioq_init(&s->io_q);
+-#ifdef CONFIG_LIBURING_REGISTER_RING_FD
+- if (io_uring_register_ring_fd(&s->ring) < 0) {
+- /*
+- * Only warn about this error: we will fallback to the non-optimized
+- * io_uring operations.
+- */
+- warn_report("failed to register linux io_uring ring file descriptor");
+- }
+-#endif
+-
+ return s;
++
+ }
+
+ void luring_cleanup(LuringState *s)
+diff --git a/meson.build b/meson.build
+index 20fddbd707..d5230eadd6 100644
+--- a/meson.build
++++ b/meson.build
+@@ -1793,7 +1793,6 @@ config_host_data.set('CONFIG_LIBNFS', libnfs.found())
+ config_host_data.set('CONFIG_LIBSSH', libssh.found())
+ config_host_data.set('CONFIG_LINUX_AIO', libaio.found())
+ config_host_data.set('CONFIG_LINUX_IO_URING', linux_io_uring.found())
+-config_host_data.set('CONFIG_LIBURING_REGISTER_RING_FD', cc.has_function('io_uring_register_ring_fd', prefix: '#include <liburing.h>', dependencies:linux_io_uring))
+ config_host_data.set('CONFIG_LIBPMEM', libpmem.found())
+ config_host_data.set('CONFIG_NUMA', numa.found())
+ config_host_data.set('CONFIG_OPENGL', opengl.found())