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If the XFD MSR has feature bits set then #NM will be raised when user space attempts to use an instruction related to one of these features. When the task has no permissions to use that feature, raise SIGILL, which is the same behavior as #UD. If the task has permissions, calculate the new buffer size for the extended feature set and allocate a larger fpstate. In the unlikely case that vzalloc() fails, SIGSEGV is raised. The allocation function will be added in the next step. Provide a stub which fails for now. [ tglx: Updated serialization ] Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20211021225527.10184-18-chang.seok.bae@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 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.