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5e9ac644c4
Add a test to verify KVM's fastops emulation via forced emulation. KVM's so called "fastop" infrastructure executes the to-be-emulated instruction directly on hardware instead of manually emulating the instruction in software, using various shenanigans to glue together the emulator context and CPU state, e.g. to get RFLAGS fed into the instruction and back out for the emulator. Add testcases for all instructions that are low hanging fruit. While the primary goal of the selftest is to validate the glue code, a secondary goal is to ensure "emulation" matches hardware exactly, including for arithmetic flags that are architecturally undefined. While arithmetic flags may be *architecturally* undefined, their behavior is deterministic for a given CPU (likely a given uarch, and possibly even an entire family or class of CPUs). I.e. KVM has effectively been emulating underlying hardware behavior for years. Link: https://lore.kernel.org/r/20250506011250.1089254-1-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.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 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.