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When making a SPTE, set the Dirty bit in the SPTE as appropriate, even if hardware A/D bits are disabled. Only EPT allows A/D bits to be disabled, and for EPT, the bits are software-available (ignored by hardware) when A/D bits are disabled, i.e. it is perfectly legal for KVM to use the Dirty to track dirty pages in software. Link: https://lore.kernel.org/r/20241011021051.1557902-17-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.