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During PRE_COPY the migration data FD may have a temporary "end of stream" that is reached when the initial_bytes were read and no other dirty data exists yet. For instance, this may indicate that the device is idle and not currently dirtying any internal state. When read() is done on this temporary end of stream the kernel driver should return ENOMSG from read(). Userspace can wait for more data or consider moving to STOP_COPY. To not block the user upon read() and let it get ENOMSG we add a new state named MLX5_MIGF_STATE_PRE_COPY on the migration file. In addition, we add the MLX5_MIGF_STATE_SAVE_LAST state to block the read() once we call the last SAVE upon moving to STOP_COPY. Any further error will be marked with MLX5_MIGF_STATE_ERROR and the user won't be blocked. Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Yishai Hadas <yishaih@nvidia.com> Link: https://lore.kernel.org/r/20221206083438.37807-12-yishaih@nvidia.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.