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 commite2848bc574
and77e3f038af
. Cc: qemu-stable@nongnu.org Signed-off-by: Sam Li <faithilikerun@gmail.com> Message-Id: <20220924144815.5591-1-faithilikerun@gmail.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Tested-by: Dario Faggioli <dfaggioli@suse.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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@ -11,7 +11,6 @@
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#include "qemu/osdep.h"
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#include <liburing.h>
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#include "block/aio.h"
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#include "qemu/error-report.h"
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#include "qemu/queue.h"
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#include "block/block.h"
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#include "block/raw-aio.h"
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@ -19,7 +18,6 @@
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#include "qapi/error.h"
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#include "trace.h"
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/* io_uring ring size */
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#define MAX_ENTRIES 128
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@ -432,17 +430,8 @@ LuringState *luring_init(Error **errp)
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}
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ioq_init(&s->io_q);
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#ifdef CONFIG_LIBURING_REGISTER_RING_FD
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if (io_uring_register_ring_fd(&s->ring) < 0) {
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/*
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* Only warn about this error: we will fallback to the non-optimized
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* io_uring operations.
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*/
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warn_report("failed to register linux io_uring ring file descriptor");
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}
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#endif
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return s;
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}
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void luring_cleanup(LuringState *s)
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@ -1839,7 +1839,6 @@ config_host_data.set('CONFIG_LIBNFS', libnfs.found())
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config_host_data.set('CONFIG_LIBSSH', libssh.found())
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config_host_data.set('CONFIG_LINUX_AIO', libaio.found())
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config_host_data.set('CONFIG_LINUX_IO_URING', linux_io_uring.found())
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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))
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config_host_data.set('CONFIG_LIBPMEM', libpmem.found())
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config_host_data.set('CONFIG_NUMA', numa.found())
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config_host_data.set('CONFIG_OPENGL', opengl.found())
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