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65e3b446bc
Add a comment to document how host_pfn_mapping_level() can be used safely, as the line between safe and dangerous is quite thin. E.g. if KVM were to ever support in-place promotion to create huge pages, consuming the level is safe if the caller holds mmu_lock and checks that there's an existing _leaf_ SPTE, but unsafe if the caller only checks that there's a non-leaf SPTE. Opportunistically tweak the existing comments to explicitly document why KVM needs to use READ_ONCE(). No functional change intended. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220715232107.3775620-3-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.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 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.