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| Filename | Latest commit message | Latest commit date |
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e1d38b63ac
Export the IA32_ARCH_CAPABILITIES MSR bit MDS_NO=0 to guests on TSX Async Abort(TAA) affected hosts that have TSX enabled and updated microcode. This is required so that the guests don't complain, "Vulnerable: Clear CPU buffers attempted, no microcode" when the host has the updated microcode to clear CPU buffers. Microcode update also adds support for MSR_IA32_TSX_CTRL which is enumerated by the ARCH_CAP_TSX_CTRL bit in IA32_ARCH_CAPABILITIES MSR. Guests can't do this check themselves when the ARCH_CAP_TSX_CTRL bit is not exported to the guests. In this case export MDS_NO=0 to the guests. When guests have CPUID.MD_CLEAR=1, they deploy MDS mitigation which also mitigates TAA. Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Neelima Krishnan <neelima.krishnan@intel.com> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> |
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| README | ||
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.