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6cb094583a
Pull x86 TDX updates from Dave Hansen: "Avoid direct HLT instruction execution in TDX guests. TDX guests aren't expected to use the HLT instruction directly. It causes a virtualization exception (#VE). While the #VE _can_ be handled, the current handling is slow and buggy and the easiest thing is just to avoid HLT in the first place. Plus, the kernel already has paravirt infrastructure that makes it relatively painless. Make TDX guests require paravirt and add some TDX-specific paravirt handlers which avoid HLT in the normal halt routines. Also add a warning in case another HLT sneaks in. There was a report that this leads to a "major performance improvement" on specjbb2015, probably because of the extra #VE overhead or missed wakeups from the buggy HLT handling" * tag 'x86_tdx_for_6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/tdx: Emit warning if IRQs are enabled during HLT #VE handling x86/tdx: Fix arch_safe_halt() execution for TDX VMs x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT
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.