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Small-BAR systems (e.g., SR-IOV VFs in VMs) expose only a subset of VRAM via PCI/BAR. Exporting a BO outside that window fails, and the selftests also do CPU fill/verify. Set XE_BO_FLAG_NEEDS_CPU_ACCESS for cross-device variants to force CPU-mappable placement and keep tests reliable. Large-BAR/P2P setups are unaffected. Suggested-by: Matthew Auld <matthew.auld@intel.com> Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://lore.kernel.org/r/20250814145950.430231-1-marcin.bernatowicz@linux.intel.com Signed-off-by: Michał Winiarski <michal.winiarski@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.