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The deferred_reset logic was added to vfio migration drivers to prevent a circular locking dependency with respect to mm_lock and state mutex. This is mainly because of the copy_to/from_user() functions(which takes mm_lock) invoked under state mutex. But for HiSilicon driver, the only place where we now hold the state mutex for copy_to_user is during the PRE_COPY IOCTL. So for pre_copy, release the lock as soon as we have updated the data and perform copy_to_user without state mutex. By this, we can get rid of the deferred_reset logic. Link: https://lore.kernel.org/kvm/20240220132459.GM13330@nvidia.com/ Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Reviewed-by: Brett Creeley <brett.creeley@amd.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/20240229091152.56664-1-shameerali.kolothum.thodi@huawei.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.