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The Secure Execution AP support makes it possible for SE VMs to securely use APQNs without a third party being able to snoop IO. VMs first bind to an APQN to securely attach it and granting protected key crypto function access. Afterwards they can associate the APQN which grants them clear key crypto function access. Once bound the APQNs are not accessible to the host until a reset is performed. The vfio-ap patches being merged here provide the base hypervisor Secure Execution / Protected Virtualization AP support. This includes proper handling of APQNs that are securely attached to a SE/PV guest especially regarding resets.
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.