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To reduce dependence on the MMU write lock, don't rely on the assumption that the atomic operation in kvm_tdp_mmu_get_root will always succeed. By not relying on that assumption, threads do not need to hold the MMU lock in write mode in order to take a reference on a TDP MMU root. In the root iterator, this change means that some roots might have to be skipped if they are found to have a zero refcount. This will still never happen as of this patch, but a future patch will need that flexibility to make the root iterator safe under the MMU read lock. Signed-off-by: Ben Gardon <bgardon@google.com> Message-Id: <20210401233736.638171-8-bgardon@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.