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When lockdep is enabled, assert that KVM accesses the register caches if and only if cache fills are guaranteed to consume fresh data, i.e. when KVM when KVM is in control of the code sequence. Concretely, the caches can only be used from task context (synchronous) or when handling a PMI VM-Exit (asynchronous, but only in specific windows where the caches are in a known, stable state). Generally speaking, there are very few flows where reading register state from an asynchronous context is correct or even necessary. So, rather than trying to figure out a generic solution, simply disallow using the caches outside of task context by default, and deal with any future exceptions on a case-by-case basis _if_ they arise. Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Link: https://lore.kernel.org/r/20241009175002.1118178-4-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.