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41786cc5ea
KVM x86 misc changes for 6.12 - Advertise AVX10.1 to userspace (effectively prep work for the "real" AVX10 functionality that is on the horizon). - Rework common MSR handling code to suppress errors on userspace accesses to unsupported-but-advertised MSRs. This will allow removing (almost?) all of KVM's exemptions for userspace access to MSRs that shouldn't exist based on the vCPU model (the actual cleanup is non-trivial future work). - Rework KVM's handling of x2APIC ICR, again, because AMD (x2AVIC) splits the 64-bit value into the legacy ICR and ICR2 storage, whereas Intel (APICv) stores the entire 64-bit value a the ICR offset. - Fix a bug where KVM would fail to exit to userspace if one was triggered by a fastpath exit handler. - Add fastpath handling of HLT VM-Exit to expedite re-entering the guest when there's already a pending wake event at the time of the exit. - Finally fix the RSM vs. nested VM-Enter WARN by forcing the vCPU out of guest mode prior to signalling SHUTDOWN (architecturally, the SHUTDOWN is supposed to hit L1, not L2).
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.