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Determining the address of the initial page table to program into CR3 involves: - taking the physical address - adding the SME encryption mask On the primary entry path, the code is mapped using a 1:1 virtual to physical translation, so the physical address can be taken directly using a RIP-relative LEA instruction. On the secondary entry path, the address can be obtained by taking the offset from the virtual kernel base (__START_kernel_map) and adding the physical kernel base. This is implemented in a slightly confusing way, so clean this up. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: Tom Lendacky <thomas.lendacky@amd.com> Link: https://lore.kernel.org/r/20240227151907.387873-14-ardb+git@google.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.