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fc66963d7b
Split out the computation of the effective size of a kvm_cpuid2 struct from allocate_kvm_cpuid2(), and modify both to take an arbitrary number of entries. Future commits will add caching of a vCPU's CPUID model, and will (a) be able to precisely size the entries array, and (b) will need to know the effective size of the struct in order to copy to/from the cache. Expose the helpers so that the Hyper-V Features test can use them in the (somewhat distant) future. The Hyper-V test very, very subtly relies on propagating CPUID info across vCPU instances, and will need to make a copy of the previous vCPU's CPUID information when it switches to using the per-vCPU cache. Alternatively, KVM could provide helpers to duplicate and/or copy a kvm_cpuid2 instance, but each is literally a single line of code if the helpers are exposed, and it's not like the size of kvm_cpuid2 is secret knowledge. Signed-off-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20220614200707.3315957-18-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 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.