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The IA32_XFD_MSR allows to arm #NM traps for XSTATE components which are enabled in XCR0. The register has to be restored before the tasks XSTATE is restored. The life time rules are the same as for FPU state. XFD is updated on return to userspace only when the FPU state of the task is not up to date in the registers. It's updated before the XRSTORS so that eventually enabled dynamic features are restored as well and not brought into init state. Also in signal handling for restoring FPU state from user space the correctness of the XFD state has to be ensured. Add it to CPU initialization and resume as well. 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/20211021225527.10184-17-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.