Hi, In this v3:
Added support for the "file:/dev/fdset/" syntax to receive multiple file descriptors. This allows the management layer to open the migration file beforehand and pass the file descriptors to QEMU. We need more than one fd to be able to use O_DIRECT concurrently with unaligned writes. Dropped the auto-pause capability. That discussion was kind of stuck. We can revisit optimizations for non-live scenarios once the series is more mature/merged. Changed the multifd incoming side to use a more generic data structure instead of MultiFDPages_t. This allows multifd to restore the ram using larger chunks. The rest are minor changes, I have noted them in the patches themselves. Thanks CI run: https://gitlab.com/farosas/qemu/-/pipelines/1086786947 v2: https://lore.kernel.org/r/20231023203608.26370-1-faro...@suse.de v1: https://lore.kernel.org/r/20230330180336.2791-1-faro...@suse.de Fabiano Rosas (24): io: fsync before closing a file channel migration/ram: Introduce 'fixed-ram' migration capability migration: Add fixed-ram URI compatibility check migration/ram: Add incoming 'fixed-ram' migration migration/multifd: Allow multifd without packets migration/multifd: Allow QIOTask error reporting without an object migration/multifd: Add outgoing QIOChannelFile support migration/multifd: Add incoming QIOChannelFile support io: Add a pwritev/preadv version that takes a discontiguous iovec multifd: Rename MultiFDSendParams::data to compress_data migration/multifd: Decouple recv method from pages migration/multifd: Allow receiving pages without packets migration/ram: Ignore multifd flush when doing fixed-ram migration migration/multifd: Support outgoing fixed-ram stream format migration/multifd: Support incoming fixed-ram stream format tests/qtest: Add a multifd + fixed-ram migration test migration: Add direct-io parameter tests/qtest: Add a test for migration with direct-io and multifd monitor: Honor QMP request for fd removal immediately monitor: Extract fdset fd flags comparison into a function monitor: fdset: Match against O_DIRECT docs/devel/migration.rst: Document the file transport migration: Add support for fdset with multifd + file tests/qtest: Add a test for fixed-ram with passing of fds Nikolay Borisov (6): io: add and implement QIO_CHANNEL_FEATURE_SEEKABLE for channel file io: Add generic pwritev/preadv interface io: implement io_pwritev/preadv for QIOChannelFile migration/qemu-file: add utility methods for working with seekable channels migration/ram: Add outgoing 'fixed-ram' migration tests/qtest: migration-test: Add tests for fixed-ram file-based migration docs/devel/migration.rst | 43 ++++ include/exec/ramblock.h | 8 + include/io/channel.h | 109 ++++++++ include/migration/qemu-file-types.h | 2 + include/qemu/bitops.h | 13 + include/qemu/osdep.h | 2 + io/channel-file.c | 69 +++++ io/channel.c | 128 ++++++++++ migration/file.c | 191 +++++++++++++- migration/file.h | 5 + migration/migration-hmp-cmds.c | 11 + migration/migration.c | 38 ++- migration/multifd-zlib.c | 22 +- migration/multifd-zstd.c | 22 +- migration/multifd.c | 376 ++++++++++++++++++++++------ migration/multifd.h | 30 ++- migration/options.c | 70 ++++++ migration/options.h | 4 + migration/qemu-file.c | 82 ++++++ migration/qemu-file.h | 7 +- migration/ram.c | 291 ++++++++++++++++++++- migration/ram.h | 1 + migration/savevm.c | 1 + monitor/fds.c | 27 +- qapi/migration.json | 24 +- tests/qtest/migration-helpers.c | 42 ++++ tests/qtest/migration-helpers.h | 1 + tests/qtest/migration-test.c | 206 +++++++++++++++ util/osdep.c | 9 + 29 files changed, 1686 insertions(+), 148 deletions(-) -- 2.35.3
