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Some driver components, like eudebug or ccs-mode, can't be used when VFs are enabled. Add functions to allow those components to block the PF from enabling VFs for the requested duration. Introduce trivial counter to allow lockdown or exclusive access that can be used in the scenarios where we can't follow the strict owner semantics as required by the rw_semaphore implementation. Before enabling VFs, the PF will try to arm the "vfs_enabling" guard for the exclusive access. This will fail if there are some lockdown requests already initiated by the other components. For testing purposes, add debugfs file which will call these new functions from the file's open/close hooks. Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Matthew Brost <matthew.brost@intel.com> Cc: Christoph Manszewski <christoph.manszewski@intel.com> Reviewed-by: Christoph Manszewski <christoph.manszewski@intel.com> Link: https://patch.msgid.link/20251109162451.4779-1-michal.wajdeczko@intel.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 reStructuredText 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.