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151bf23249
In preparation for upcoming CET virtualization support, the CET supervisor state will be added as a "guest-only" feature, since it is required only by KVM (i.e., guest FPUs). Establish the infrastructure for "guest-only" features. Define a new XFEATURE_MASK_GUEST_SUPERVISOR mask to specify features that are enabled by default in guest FPUs but not in host FPUs. Specifically, for any bit in this set, permission is granted and XSAVE space is allocated during vCPU creation. Non-guest FPUs cannot enable guest-only features, even dynamically, and no XSAVE space will be allocated for them. The mask is currently empty, but this will be changed by a subsequent patch. Co-developed-by: Chao Gao <chao.gao@intel.com> Signed-off-by: Chao Gao <chao.gao@intel.com> Signed-off-by: Yang Weijiang <weijiang.yang@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Reviewed-by: John Allen <john.allen@amd.com> Link: https://lore.kernel.org/all/20250522151031.426788-6-chao.gao%40intel.com |
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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 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.