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9b72c3d59f
Use a dedicated array of MSRPM offsets to merge L0 and L1 bitmaps, i.e. to merge KVM's vmcb01 bitmap with L1's vmcb12 bitmap. This will eventually allow for the removal of direct_access_msrs, as the only path where tracking the offsets is truly justified is the merge for nested SVM, where merging in chunks is an easy way to batch uaccess reads/writes. Opportunistically omit the x2APIC MSRs from the merge-specific array instead of filtering them out at runtime. Note, disabling interception of DEBUGCTL, XSS, EFER, PAT, GHCB, and TSC_AUX is mutually exclusive with nested virtualization, as KVM passes through those MSRs only for SEV-ES guests, and KVM doesn't support nested virtualization for SEV+ guests. Defer removing those MSRs to a future cleanup in order to make this refactoring as benign as possible. Link: https://lore.kernel.org/r/20250610225737.156318-11-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@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 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.