No description
  • C 96.8%
  • Assembly 0.9%
  • Rust 0.7%
  • Shell 0.6%
  • Python 0.5%
  • Other 0.3%
Find a file
Linus Torvalds 6cb094583a * Avoid direct HLT instruction execution in TDX guests
-----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEV76QKkVc4xCGURexaDWVMHDJkrAFAmfsa8QACgkQaDWVMHDJ
 krBCAhAAodPYiIEy+qpad1Q8HPhaKYUJ5jzkIdt1GYXCBf2dfY6Zj8w7edSApUhA
 7og9gK8ku8hwpf6oCGmp2Lm74FgATIj7q0ac07XBW3OsrfFQc73DfPJn6WMDYjRV
 ec9baSzX5GcqUyezq7woyJayZT9LRLBexF/vk7dAQ7nuecCOUhqLXWBN5eUT0e+K
 58kFjZoZZx/4Y9zh7UIxBQyCbL88IeI6rclW5tZJlRHNuD7B64x606ETwQJKK9GK
 YHPhqRKtjJRzSOn/xGYT4AQDPbF9u14Q4WGVO+bvgv8Z6BtmiYV2fG0q5GU14h0z
 +gwjja3Edo+F6zSIIZonQbrSVHspwm1IPJQQZHljhFOEt7Ezu3hLIYouUWVlNRgl
 mRzubZBmhQUfJOAtfGmHktdg6j+QinYDQr+/CjoXoeh8EknL+KtqamXJnyb8KAMN
 qH6X+N2coaCcl334zW44m6YTmTipdIhmHFj6edYwqdR3Ux6DDaX9PKopIIpiZEcb
 GH1o++4JMp9OBIaTu0Yp1WgWJ+EyUSWDJbydqCMOdthuESqKW45IQkLhPxZpIhB4
 5Wra4Ot7AdsThyPqNPaEu3ND+BXu4tAAa8r8GK+AP7DqRxXz/bbWTHqNepm9wSvP
 pnOlLyVTri/difMWWsJJPK6QRYbNnemrny3Do3PbIZVKS08vgLs=
 =XvoD
 -----END PGP SIGNATURE-----

Merge tag 'x86_tdx_for_6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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
History 2025-04-02 11:33:20 -07:00
arch
block
certs
crypto
Documentation
drivers
fs
include
init
io_uring
ipc
kernel
lib
LICENSES
mm
net
rust
samples
scripts
security
sound
tools
usr
virt
.clang-format
.clippy.toml
.cocciconfig
.editorconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
.rustfmt.toml
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile
README

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.