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f91699d569
If KVM is doing "early" nested VM-Enter consistency checks and TSC scaling
is supported, stuff vmcs02's TSC Multiplier early on to avoid getting a
false positive VM-Fail due to trying to do VM-Enter with TSC_MULTIPLIER=0.
To minimize complexity around L1 vs. L2 TSC, KVM sets the actual TSC
Multiplier rather late during VM-Entry, i.e. may have '0' at the time of
early consistency checks.
If vmcs12 has TSC Scaling enabled, use the multiplier from vmcs12 so that
nested early checks actually check vmcs12 state, otherwise throw in an
arbitrary value of '1' (anything non-zero is legal).
Fixes: d041b5ea93 ("KVM: nVMX: Enable nested TSC scaling")
Link: https://lore.kernel.org/r/20250919005955.1366256-8-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.