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Dave Hansen a6dd6f3900 x86/tdx: Prepare for using "INFO" call for a second purpose
The TDG.VP.INFO TDCALL provides the guest with various details about
the TDX system that the guest needs to run.  Only one field is currently
used: 'gpa_width' which tells the guest which PTE bits mark pages shared
or private.

A second field is now needed: the guest "TD attributes" to tell if
virtualization exceptions are configured in a way that can harm the guest.

Make the naming and calling convention more generic and discrete from the
mask-centric one.

Thanks to Sathya for the inspiration here, but there's no code, comments
or changelogs left from where he started.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: stable@vger.kernel.org
History 2022-11-01 10:07:15 -07:00
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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.