kernel.git/Documentation/arch/x86, branch linux-rolling-lts

Merge tag 'x86_tdx_for_6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-10-04T17:01:30Z

Pull x86 TDX updates from Dave Hansen: "The biggest change here is making TDX and kexec play nicely together. Before this, the memory encryption hardware (which doesn't respect cache coherency) could write back old cachelines on top of data in the new kernel, so kexec and TDX were made mutually exclusive. This removes the limitation. There is also some work to tighten up a hardware bug workaround and some MAINTAINERS updates. - Make TDX and kexec work together - Skip TDX bug workaround when the bug is not present - Update maintainers entries" * tag 'x86_tdx_for_6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/virt/tdx: Use precalculated TDVPR page physical address KVM/TDX: Explicitly do WBINVD when no more TDX SEAMCALLs x86/virt/tdx: Update the kexec section in the TDX documentation x86/virt/tdx: Remove the !KEXEC_CORE dependency x86/kexec: Disable kexec/kdump on platforms with TDX partial write erratum x86/virt/tdx: Mark memory cache state incoherent when making SEAMCALL x86/sme: Use percpu boolean to control WBINVD during kexec x86/kexec: Consolidate relocate_kernel() function parameters x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present x86/tdx: Tidy reset_pamt functions x86/tdx: Eliminate duplicate code in tdx_clear_page() MAINTAINERS: Add KVM mail list to the TDX entry MAINTAINERS: Add Rick Edgecombe as a TDX reviewer MAINTAINERS: Update the file list in the TDX entry.

Merge tag 'docs-6.18' of git://git.lwn.net/linux

2025-10-04T00:16:13Z

Pull documentation updates from Jonathan Corbet: "It has been a relatively busy cycle in docsland, with changes all over: - Bring the kernel memory-model docs into the Sphinx build in the "literal include" mode. - Lots of build-infrastructure work, further cleaning up long-term kernel-doc technical debt. The sphinx-pre-install tool has been converted to Python and updated for current systems. - A new tool to detect when documents have been moved and generate HTML redirects; this can be used on kernel.org (or any other site hosting the rendered docs) to avoid breaking links. - Automated processing of the YAML files describing the netlink protocol. - A significant update of the maintainer's PGP guide. ... and a seemingly endless series of typo fixes, build-problem fixes, etc" * tag 'docs-6.18' of git://git.lwn.net/linux: (193 commits) Documentation/features: Update feature lists for 6.17-rc7 docs: remove cdomain.py Documentation/process: submitting-patches: fix typo in "were do" docs: dev-tools/lkmm: Fix typo of missing file extension Documentation: trace: histogram: Convert ftrace docs cross-reference Documentation: trace: histogram-design: Wrap introductory note in note:: directive Documentation: trace: historgram-design: Separate sched_waking histogram section heading and the following diagram Documentation: trace: histogram-design: Trim trailing vertices in diagram explanation text Documentation: trace: histogram: Fix histogram trigger subsection number order docs: driver-api: fix spelling of "buses". Documentation: fbcon: Use admonition directives Documentation: fbcon: Reindent 8th step of attach/detach/unload Documentation: fbcon: Add boot options and attach/detach/unload section headings docs: filesystems: sysfs: add remaining top level sysfs directory descriptions docs: filesystems: sysfs: clarify symlink destinations in dev and bus/devices descriptions docs: filesystems: sysfs: remove top level sysfs net directory docs: maintainer: Fix ambiguous subheading formatting docs: kdoc: a few more dump_typedef() tweaks docs: kdoc: remove redundant comment stripping in dump_typedef() docs: kdoc: remove some dead code in dump_typedef() ...

Documentation/x86/topology: Detail CPUID leaves used for topology enumeration

2025-09-17T09:24:54Z

Add a new section describing the different CPUID leaves and fields used to parse topology on x86 systems. [ bp: Cleanups and simplifications ontop. ] Suggested-by: Borislav Petkov Signed-off-by: K Prateek Nayak Signed-off-by: Borislav Petkov (AMD) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/20250901170418.4314-1-kprateek.nayak@amd.com

x86/virt/tdx: Update the kexec section in the TDX documentation

2025-09-05T17:40:40Z

TDX host kernel now supports kexec/kdump. Update the documentation to reflect that. Opportunistically, remove the parentheses in "Kexec()" and move this section under the "Erratum" section because the updated "Kexec" section now refers to that erratum. Signed-off-by: Kai Huang Signed-off-by: Paolo Bonzini Signed-off-by: Dave Hansen Reviewed-by: Rick Edgecombe Tested-by: Farrah Chen Link: https://lore.kernel.org/all/20250901160930.1785244-7-pbonzini%40redhat.com

Documentation: Fix minor typos

2025-08-11T17:12:46Z

Corrected a few spelling errors and improved the phrasing changes since v1: --corrected as per review Signed-off-by: Ranganath V N Reviewed-by: Randy Dunlap Signed-off-by: Jonathan Corbet Link: https://lore.kernel.org/r/20250726063645.4156-1-vnranganath.20@gmail.com

Merge tag 'x86-platform-2025-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-07-30T03:05:06Z

Pull x86 platform updates from Ingo Molnar: "This adds support for the AMD hardware feedback interface (HFI), by Perry Yuan" * tag 'x86-platform-2025-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/itmt: Add debugfs file to show core priorities platform/x86/amd: hfi: Add debugfs support platform/x86/amd: hfi: Set ITMT priority from ranking data cpufreq/amd-pstate: Disable preferred cores on designs with workload classification x86/process: Clear hardware feedback history for AMD processors platform/x86: hfi: Add power management callback platform/x86: hfi: Add online and offline callback support platform/x86: hfi: Init per-cpu scores for each class platform/x86: hfi: Parse CPU core ranking data from shared memory platform/x86: hfi: Introduce AMD Hardware Feedback Interface Driver x86/msr-index: Add AMD workload classification MSRs MAINTAINERS: Add maintainer entry for AMD Hardware Feedback Driver Documentation/x86: Add AMD Hardware Feedback Interface documentation

Merge tag 'hardening-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

2025-07-29T00:16:12Z

Pull hardening updates from Kees Cook: - Introduce and start using TRAILING_OVERLAP() helper for fixing embedded flex array instances (Gustavo A. R. Silva) - mux: Convert mux_control_ops to a flex array member in mux_chip (Thorsten Blum) - string: Group str_has_prefix() and strstarts() (Andy Shevchenko) - Remove KCOV instrumentation from __init and __head (Ritesh Harjani, Kees Cook) - Refactor and rename stackleak feature to support Clang - Add KUnit test for seq_buf API - Fix KUnit fortify test under LTO * tag 'hardening-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (22 commits) sched/task_stack: Add missing const qualifier to end_of_stack() kstack_erase: Support Clang stack depth tracking kstack_erase: Add -mgeneral-regs-only to silence Clang warnings init.h: Disable sanitizer coverage for __init and __head kstack_erase: Disable kstack_erase for all of arm compressed boot code x86: Handle KCOV __init vs inline mismatches arm64: Handle KCOV __init vs inline mismatches s390: Handle KCOV __init vs inline mismatches arm: Handle KCOV __init vs inline mismatches mips: Handle KCOV __init vs inline mismatch powerpc/mm/book3s64: Move kfence and debug_pagealloc related calls to __init section configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON configs/hardening: Enable CONFIG_KSTACK_ERASE stackleak: Split KSTACK_ERASE_CFLAGS from GCC_PLUGINS_CFLAGS stackleak: Rename stackleak_track_stack to __sanitizer_cov_stack_depth stackleak: Rename STACKLEAK to KSTACK_ERASE seq_buf: Introduce KUnit tests string: Group str_has_prefix() and strstarts() kunit/fortify: Add back "volatile" for sizeof() constants acpi: nfit: intel: avoid multiple -Wflex-array-member-not-at-end warnings ...

stackleak: Rename STACKLEAK to KSTACK_ERASE

2025-07-22T04:35:01Z

In preparation for adding Clang sanitizer coverage stack depth tracking that can support stack depth callbacks: - Add the new top-level CONFIG_KSTACK_ERASE option which will be implemented either with the stackleak GCC plugin, or with the Clang stack depth callback support. - Rename CONFIG_GCC_PLUGIN_STACKLEAK as needed to CONFIG_KSTACK_ERASE, but keep it for anything specific to the GCC plugin itself. - Rename all exposed "STACKLEAK" names and files to "KSTACK_ERASE" (named for what it does rather than what it protects against), but leave as many of the internals alone as possible to avoid even more churn. While here, also split "prev_lowest_stack" into CONFIG_KSTACK_ERASE_METRICS, since that's the only place it is referenced from. Suggested-by: Ingo Molnar Link: https://lore.kernel.org/r/20250717232519.2984886-1-kees@kernel.org Signed-off-by: Kees Cook

Documentation/x86: Add AMD Hardware Feedback Interface documentation

2025-07-07T17:22:02Z

Introduce a new documentation file, `amd_hfi.rst`, which delves into the implementation details of the AMD Hardware Feedback Interface and its associated driver, `amd_hfi`. This documentation describes how the driver provides hint to the OS scheduling which depends on the capability of core performance and efficiency ranking data. This documentation describes: * The design of the driver * How the driver provides hints to the OS scheduling * How the driver interfaces with the kernel for efficiency ranking data. Signed-off-by: Perry Yuan Signed-off-by: Mario Limonciello Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Bagas Sanjaya Reviewed-by: Mario Limonciello Acked-by: Ilpo Järvinen Link: https://lore.kernel.org/20250609200518.3616080-2-superm1@kernel.org

x86/bugs: Rename MDS machinery to something more generic

2025-06-16T16:45:18Z

It will be used by other x86 mitigations. No functional changes. Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Pawan Gupta