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8c01290bda
When handling KVM_SET_CPUID{,2}, swap the old and new CPUID arrays and
lengths before processing the new CPUID, and simply undo the swap if
setting the new CPUID fails for whatever reason.
To keep the diff reasonable, continue passing the entry array and length
to most helpers, and defer the more complete cleanup to future commits.
For any sane VMM, setting "bad" CPUID state is not a hot path (or even
something that is surviable), and setting guest CPUID before it's known
good will allow removing all of KVM's infrastructure for processing CPUID
entries directly (as opposed to operating on vcpu->arch.cpuid_entries).
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20241128013424.4096668-32-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.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.