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0205f8a738
When SRBDS is mitigated by TSX OFF, update_srbds_msr() will still read and write to MSR_IA32_MCU_OPT_CTRL even when that MSR is not supported due to not having loaded the appropriate microcode. Check for X86_FEATURE_SRBDS_CTRL which is set only when the respective microcode which adds MSR_IA32_MCU_OPT_CTRL is loaded. Based on a patch by Thadeu Lima de Souza Cascardo <cascardo@canonical.com>. [ bp: Massage commit message. ] Suggested-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20220401074517.1848264-1-ricardo.canuelo@collabora.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.