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This series introduces callbacks to facilitate the entry of a TD VCPU and the corresponding save/restore of host state. A TD VCPU is entered via the SEAMCALL TDH.VP.ENTER. The TDX Module manages the save/restore of guest state and, in conjunction with the SEAMCALL interface, handles certain aspects of host state. However, there are specific elements of the host state that require additional attention, as detailed in the Intel TDX ABI documentation for TDH.VP.ENTER. TDX is quite different from VMX in this regard. For VMX, the host VMM is heavily involved in restoring, managing and saving guest CPU state, whereas for TDX this is handled by the TDX Module. In that way, the TDX Module can protect the confidentiality and integrity of TD CPU state. The TDX Module does not save/restore all host CPU state because the host VMM can do it more efficiently and selectively. CPU state referred to below is host CPU state. Often values are already held in memory so no explicit save is needed, and restoration may not be needed if the kernel is not using a feature. TDX does not support PAUSE-loop exiting. According to the TDX Module Base arch. spec., hypercalls are expected to be used instead. Note that the Linux TDX guest supports existing hypercalls via TDG.VP.VMCALL. This series requires TDX module 1.5.06.00.0744, or later, due to removal of the workarounds for the lack of the NO_RBP_MOD feature required by the kernel. NO_RBP_MOD is now required. |
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| README | ||
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.