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Sean Christopherson 1b5ef14dc6 KVM: SVM: Add host SEV-ES save area structure into VMCB via a union
Incorporate the _host_ SEV-ES save area into the VMCB as a union with the
legacy save area.  The SEV-ES variant used to save/load host state is
larger than the legacy save area, but resides at the same offset.  Prefix
the field with "host" to make it as obvious as possible that the SEV-ES
variant in the VMCB is only ever used for host state.  Guest state for
SEV-ES VMs is stored in a completely separate page (VMSA), albeit with
the same layout as the host state.

Add a compile-time assert to ensure the VMCB layout is correct, i.e. that
KVM's layout matches the architectural definitions.

No functional change intended.

Link: https://lore.kernel.org/r/20240802204511.352017-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
History 2024-08-29 19:06:12 -07:00
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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.