[Qemu-devel] [PATCH v4 0/9] Add support for io_uring

[Aarushi Mehta]

This patch series adds support for the newly developed io_uring Linux AIO
interface. Linux io_uring is faster than Linux's AIO asynchronous I/O code,
offers efficient buffered asynchronous I/O support, the ability to do I/O
without performing a system call via polled I/O, and other efficiency 
enhancements.

Testing it requires a host kernel (5.1+) and the liburing library.
Use the option -drive aio=io_uring to enable it.

v4:
- Add error handling
- Add trace events
- Remove aio submission based code

v3:
- Fix major errors in io_uring (sorry)
- Option now enumerates for CONFIG_LINUX_IO_URING
- pkg config support added

Aarushi Mehta (9):
  configure: permit use of io_uring
  qapi/block-core: add option for io_uring
  block/block: add BDRV flag for io_uring
  block/io_uring: implements interfaces for io_uring
  stubs: add stubs for io_uring interface
  util/async: add aio interfaces for io_uring
  blockdev: accept io_uring as option
  block/file-posix.c: extend to use io_uring
  block: add trace events for io_uring

 MAINTAINERS             |   8 +
 block/Makefile.objs     |   3 +
 block/file-posix.c      |  85 +++++++++--
 block/io_uring.c        | 325 ++++++++++++++++++++++++++++++++++++++++
 block/trace-events      |   8 +
 blockdev.c              |   4 +-
 configure               |  27 ++++
 include/block/aio.h     |  16 +-
 include/block/block.h   |   1 +
 include/block/raw-aio.h |  12 ++
 qapi/block-core.json    |   4 +-
 stubs/Makefile.objs     |   1 +
 stubs/io_uring.c        |  32 ++++
 util/async.c            |  36 +++++
 14 files changed, 543 insertions(+), 19 deletions(-)
 create mode 100644 block/io_uring.c
 create mode 100644 stubs/io_uring.c

-- 
2.17.1