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80dacb0804
Instead of using X86_FEATURE_USE_IBPB to guard the IBPB execution in KVM when a new vCPU is loaded, introduce a static branch, similar to switch_mm_*_ibpb. This makes it obvious in spectre_v2_user_select_mitigation() what exactly is being toggled, instead of the unclear X86_FEATURE_USE_IBPB (which will be shortly removed). It also provides more fine-grained control, making it simpler to change/add paths that control the IBPB in the vCPU switch path without affecting other IBPBs. Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Josh Poimboeuf <jpoimboe@kernel.org> Acked-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20250227012712.3193063-5-yosry.ahmed@linux.dev |
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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.