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The RMPUPDATE instruction updates the access restrictions for a page via its corresponding entry in the RMP Table. The hypervisor will use the instruction to enforce various access restrictions on pages used for confidential guests and other specialized functionality. See APM3 for details on the instruction operations. The PSMASH instruction expands a 2MB RMP entry in the RMP table into a corresponding set of contiguous 4KB RMP entries while retaining the state of the validated bit from the original 2MB RMP entry. The hypervisor will use this instruction in cases where it needs to re-map a page as 4K rather than 2MB in a guest's nested page table. Add helpers to make use of these instructions. [ mdr: add RMPUPDATE retry logic for transient FAIL_OVERLAP errors. ] Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> Signed-off-by: Michael Roth <michael.roth@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> Link: https://lore.kernel.org/r/20240126041126.1927228-11-michael.roth@amd.com |
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| .rustfmt.toml | ||
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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 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.