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Linus Torvalds a940b03cee ARM:
- Take a reference on the last IRQ loaded into an LR to prevent it
   from being freed while running the guest (Marc Zyngier)
 
 - Ensure that the ITS MOVALL command only affects LPIs that were
   previously affined to the source redistributor (Marc Zyngier)
 
 - Fix + test for honoring the host's trap configuration when running
   non-protected VMs while KVM is in protected mode (Fuad Tabba)
 
 - Use the host stage-1 mapping granularity for VM_PFNMAP mappings at
   stage-2 (Mostafa Saleh)
 
 x86:
 
 Various bugfixes where the guest could do stupid things on purpose to
 cause problems in the host:
 
 - Failed VMRUNs can cause pending TLB flushes to be dropped, and in
   general some actions done through VMCB control fields have to be redone
   if VMRUN fails
 
 - Toggling MSR interceptions or eVMCS execution controls can cause the
   host to use a stale MSR permission bitmap
 
 - Bad page tables can cause a WARN.
 
 Also fix issues in last week's pull request (my fault, for changing
 email workflow and thus missing feedback sent to kvm@ but not LKML).
 
 Generic:
 
 - Take kvm_lock when creating vCPUs. For almost two decades everybody
   thought it was not done for some unspecified performance reasons, but
   in reality it was only done because kvm_lock was originally a spinlock.
   This is a better fix than 97d65b544f ("KVM: Check for duplicate vcpu_id
   as early as possible", from the 7.3 merge window), and does not waste
   2K per VM, hence its inclusion here.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "The most intrusive change is reverting a commit from 7.3-rc1 that made
  struct kvm a bit too large, and fixing the same issue otherwise.

  There are again a lot of selftests lines; the sheer number of commits
  is not small but I don't expect much more for 7.3 due to people
  travelling to Plumbers next week.

  ARM:

   - Take a reference on the last IRQ loaded into an LR to prevent it
     from being freed while running the guest (Marc Zyngier)

   - Ensure that the ITS MOVALL command only affects LPIs that were
     previously affined to the source redistributor (Marc Zyngier)

   - Fix + test for honoring the host's trap configuration when running
     non-protected VMs while KVM is in protected mode (Fuad Tabba)

   - Use the host stage-1 mapping granularity for VM_PFNMAP mappings at
     stage-2 (Mostafa Saleh)

  x86:

  Various bugfixes where the guest could do stupid things on purpose to
  cause problems in the host:

   - Failed VMRUNs can cause pending TLB flushes to be dropped, and in
     general some actions done through VMCB control fields have to be
     redone if VMRUN fails

   - Toggling MSR interceptions or eVMCS execution controls can cause
     the host to use a stale MSR permission bitmap

   - Bad page tables can cause a WARN.

  Also fix issues in last week's pull request (my fault, for changing
  email workflow and thus missing feedback sent to kvm@ but not LKML).

  Generic:

   - Take kvm_lock when creating vCPUs. For almost two decades everybody
     thought it was not done for some unspecified performance reasons,
     but in reality it was only done because kvm_lock was originally a
     spinlock.

     This is a better fix than 97d65b544f ("KVM: Check for duplicate
     vcpu_id as early as possible", from the 7.3 merge window), and does
     not waste 2K per VM, hence its inclusion here"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (29 commits)
  KVM: arm64: Use stage-1 leaf size for VM_PFNMAP
  KVM: arm64: selftests: Check a feature hidden in an ID register is UNDEF
  KVM: arm64: Use the host's HCR_EL2 for non-protected VMs in pKVM
  KVM: arm64: Clear HCR_EL2.RW for 32-bit non-protected vCPUs
  KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT
  KVM: arm64: vgic-its: Fix MOVALL handling of source redistributor
  KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq
  KVM: arm64: vgic: Allow last_lr_irq to be NULL when LRs are not overflowing
  KVM: SEV: Do cache maintenance on the source VM *before* clearing SEV state
  KVM: SEV: Nullify "have run CPUs" mask pointer when freeing it
  KVM: selftests: Extend nested x2APIC test to validate using eVMCS for vmcs12
  KVM: selftests: Extend nested x2APIC test to validate disabling x2APIC virt
  KVM: selftests: Verify that L0's TPR doesn't get clobbered
  KVM: selftests: Run the nested x2APIC with and without APICv being inhibited in L2
  KVM: selftests: Add x2APIC MSR test for inhibiting APICv while nested
  KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
  KVM: SVM: Use the active VMCB's MSR bitmap when checking if MSR is intercepted
  KVM: SVM: Sync guest's PERF_CNTR_GLOBAL_CTL from h/w only on successful VMRUN
  KVM: SVM: Don't mark ASID fields as dirty when setting control.tlb_ctl
  KVM: SVM: Update control fields on #VMEXIT if and only if VMRUN succeeded
  ...
History 2026-10-01 10:57:19 -07:00
arch ARM: 2026-10-01 10:57:19 -07:00
block SCSI fixes on 20260925 2026-09-25 14:41:52 -07:00
certs treewide: fix indentation and whitespace in Kconfig files 2026-05-28 21:24:42 -07:00
crypto This push fixes a memory allocation overrun in crypto acomp. 2026-08-28 09:28:40 -07:00
Documentation ata fixes for 7.3-rc5 2026-09-26 11:14:35 -07:00
drivers Including fixes from Bluetooth, WiFi and netfilter. 2026-10-01 06:41:59 -07:00
fs Driver core fixes for 7.3-rc5 2026-09-27 09:57:03 -07:00
include ARM: 2026-10-01 10:57:19 -07:00
init Bootconfig fixes for v7.3-rc3 2026-09-13 09:16:36 -07:00
io_uring io_uring-7.3-20260911 2026-09-11 12:36:13 -07:00
ipc mm.git review status for master..mm-nonmm-stable 2026-08-23 08:07:11 -07:00
kernel Summary 2026-10-01 06:31:40 -07:00
lib 14 hotfixes. 10 are cc:stable. 11 are for MM. 2026-09-14 08:59:09 -07:00
LICENSES LICENSES: Add modern form of the LGPL-2.1 tags to the usage guide section 2025-10-22 07:58:19 +02:00
mm 10 hotfixes. 5 are cc:stable. 2026-09-28 20:11:31 -07:00
net netfilter pull request 26-09-30 2026-10-01 12:00:40 +02:00
rust rust: net: netlink: validate attribute length before casting to c_int 2026-09-29 12:28:03 +02:00
samples rust: samples: add missing newlines in rust_print_main 2026-09-01 02:20:22 +02:00
scripts hid-for-linus-2026092202 2026-09-22 10:30:17 -07:00
security ipe/stable-7.3 PR 20260925 2026-09-25 15:55:03 -07:00
sound ASoC: Fixes for v7.3 2026-09-17 08:15:32 +02:00
tools ARM: 2026-10-01 10:57:19 -07:00
usr usr: Correct a spelling by changing a letter 2026-08-05 14:51:58 +02:00
virt KVM: WARN if vCPU creation is in-progress when locking all vCPUs 2026-09-26 00:49:49 -04:00
.clang-format drm/bridge: rename drm_for_each_bridge_in_chain_scoped() to drm_for_each_bridge_in_chain() 2026-07-14 17:55:51 +02:00
.clippy.toml rust: bump Clippy's MSRV and clean incompatible_msrv allows 2026-04-07 09:51:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig editorconfig: add rst extension 2026-01-26 19:07:09 -08:00
.get_maintainer.ignore .get_maintainer.ignore: add myself 2026-09-07 10:01:33 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore SPDX patches for 7.2-rc1 2026-06-22 12:06:22 -07:00
.mailmap MAINTAINERS: update Eric Dumazet's email address 2026-09-24 13:33:37 -07:00
.pylintrc docs: Move the python libraries to tools/lib/python 2025-11-18 09:22:40 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS Driver core fixes for 7.3-rc2 2026-09-05 11:59:05 -07:00
Kbuild checksyscalls: move instance functionality into generic code 2026-04-05 09:21:32 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS Including fixes from Bluetooth, WiFi and netfilter. 2026-10-01 06:41:59 -07:00
Makefile Linux 7.3-rc5 2026-09-27 13:55:01 -07:00
README README: remove out of place emdashes 2026-07-15 10:51:29 -06:00

Linux kernel
============

The Linux kernel is the core of any Linux operating system. It manages hardware,
system resources, and provides the fundamental services for all other software.

Quick Start
-----------

* Report a bug: See Documentation/admin-guide/reporting-issues.rst
* Get the latest kernel: https://kernel.org
* Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst
* Join the community: https://lore.kernel.org/

Essential Documentation
-----------------------

All users should be familiar with:

* Building requirements: Documentation/process/changes.rst
* Code of Conduct: Documentation/process/code-of-conduct.rst
* License: See COPYING

Documentation can be built with make htmldocs or viewed online at:
https://www.kernel.org/doc/html/latest/


Who Are You?
============

Find your role below:

* New Kernel Developer: Getting started with kernel development
* Academic Researcher: Studying kernel internals and architecture
* Security Expert: Hardening and vulnerability analysis
* Backport/Maintenance Engineer: Maintaining stable kernels
* System Administrator: Configuring and troubleshooting
* Maintainer: Leading subsystems and reviewing patches
* Hardware Vendor: Writing drivers for new hardware
* Distribution Maintainer: Packaging kernels for distros
* AI Coding Assistant: LLMs and AI-powered development tools


For Specific Users
==================

New Kernel Developer
--------------------

Welcome! Start your kernel development journey here:

* Getting Started: Documentation/process/development-process.rst
* Your First Patch: Documentation/process/submitting-patches.rst
* Coding Style: Documentation/process/coding-style.rst
* Build System: Documentation/kbuild/index.rst
* Development Tools: Documentation/dev-tools/index.rst
* Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst
* Core APIs: Documentation/core-api/index.rst

Academic Researcher
-------------------

Explore the kernel's architecture and internals:

* Researcher Guidelines: Documentation/process/researcher-guidelines.rst
* Memory Management: Documentation/mm/index.rst
* Scheduler: Documentation/scheduler/index.rst
* Networking Stack: Documentation/networking/index.rst
* Filesystems: Documentation/filesystems/index.rst
* RCU (Read-Copy Update): Documentation/RCU/index.rst
* Locking Primitives: Documentation/locking/index.rst
* Power Management: Documentation/power/index.rst

Security Expert
---------------

Security documentation and hardening guides:

* Security Documentation: Documentation/security/index.rst
* LSM Development: Documentation/security/lsm-development.rst
* Self Protection: Documentation/security/self-protection.rst
* Reporting Vulnerabilities: Documentation/process/security-bugs.rst
* CVE Procedures: Documentation/process/cve.rst
* Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst
* Security Features: Documentation/userspace-api/seccomp_filter.rst

Backport/Maintenance Engineer
-----------------------------

Maintain and stabilize kernel versions:

* Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst
* Backporting Guide: Documentation/process/backporting.rst
* Applying Patches: Documentation/process/applying-patches.rst
* Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst
* Git for Maintainers: Documentation/maintainer/configure-git.rst

System Administrator
--------------------

Configure, tune, and troubleshoot Linux systems:

* Admin Guide: Documentation/admin-guide/index.rst
* Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst
* Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst
* Tracing/Debugging: Documentation/trace/index.rst
* Performance Security: Documentation/admin-guide/perf-security.rst
* Hardware Monitoring: Documentation/hwmon/index.rst

Maintainer
----------

Lead kernel subsystems and manage contributions:

* Maintainer Handbook: Documentation/maintainer/index.rst
* Pull Requests: Documentation/maintainer/pull-requests.rst
* Managing Patches: Documentation/maintainer/modifying-patches.rst
* Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst
* Development Process: Documentation/process/maintainer-handbooks.rst
* Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst
* Git Configuration: Documentation/maintainer/configure-git.rst

Hardware Vendor
---------------

Write drivers and support new hardware:

* Driver API Guide: Documentation/driver-api/index.rst
* Driver Model: Documentation/driver-api/driver-model/driver.rst
* Device Drivers: Documentation/driver-api/infrastructure.rst
* Bus Types: Documentation/driver-api/driver-model/bus.rst
* Device Tree Bindings: Documentation/devicetree/bindings/
* Power Management: Documentation/driver-api/pm/index.rst
* DMA API: Documentation/core-api/dma-api.rst

Distribution Maintainer
-----------------------

Package and distribute the kernel:

* Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst
* ABI Documentation: Documentation/ABI/README
* Kernel Configuration: Documentation/kbuild/kconfig.rst
* Module Signing: Documentation/admin-guide/module-signing.rst
* Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst
* Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst

AI Coding Assistant
-------------------

CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and
follow the AI coding assistants documentation before contributing to the Linux
kernel:

* Documentation/process/coding-assistants.rst

This documentation contains essential requirements about licensing, attribution,
and the Developer Certificate of Origin that all AI tools must comply with.


Communication and Support
=========================

* Mailing Lists: https://lore.kernel.org/
* IRC: #kernelnewbies on irc.oftc.net
* Bugzilla: https://bugzilla.kernel.org/
* MAINTAINERS file: Lists subsystem maintainers and mailing lists
* Email Clients: Documentation/process/email-clients.rst