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Linux kernel source tree
7bb6284aa7
* Add support for 'slot' based PMU events, paired with new UAPI that
compels the user to select a specific PMU implementation
* Lazy save/restore of vCPU state for pKVM, along with various fixes
and cleanups to the management of vCPU state between the untrusted
host and pKVM hypervisor
* Disable traps of EL1 registers for nested hypervisors when FEAT_NV2p1
is present, guaranteeing that EL2-specific register bits are stateful
in the EL1 counterpart
* Leverage FEAT_NV3 to avoid unnecessary ERET/TLBI traps when the scope
of those instructions remains 'in host' (i.e. L1 kernel/userspace)
* Pile of fixes for the management of the VNCR pseudo-TLB, such as
under-invalidations and races with concurrent TLBIs on other vCPUs
* Consolidate the non-protected and pKVM view of ICH_VTR_EL2 to a
runtime-patched constant, allowing the same data to be shared with
pKVM prior to dropping host privileges
* Considerable pile of LLM-assisted fixes around the shop but mostly in
the VGIC, our in-kernel generator of bugs (and sometimes interrupts)
LoongArch:
* Advertise already-supported capabilities.
* Some bug fixes about timer and MMIO.
* Some hardening about interrupt injection.
* Replace kvm_err() with kvm_pr_unimpl().
* Add FPU/LSX/LASX test cases for selftests.
RISC-V:
* Svadu/Zicfiss/Zicfilp FWFT support for Guest
* Use try_cmpxchg for IMSIC MRIF RMW
* More arch-specific tracepoints in KVM RISC-V
* Eager page splitting when enabling dirty logging
* Optimize hfence request handling for SMP Guests
* Improve dirty log clearing by skipping zero bits in mask
* Guard HFENCE range loops against overflow
* CPU PM notifiers in KVM RISC-V for non-retentive idle states
* Fix kernel-mode vector context save/restore for Guest
s390:
* Fixes for vfio-ap
* Fixes for the gmap rework
* Fixes for vsie
* AI triggered fixes all over
* diag9c tracing
* code move preparation for the additional arm64 support
* enable CONTEXT_ANALYSIS
x86:
* Perform spring cleaning on x86.{c,h} and asm/kvm_host.h, by adding regs.c
(the kvm_cache_regs.h => regs.h is already applied) and msrs.{c,h}, and moving
relevant code out of x86.c.
* Split kvm_mmu in three parts, respectively to describe the format of page
tables, walking the guest page tables and building the page tables. Always
use the same page table walker kvm->arch.gva_walk as the entry point to
convert a guest's virtual address, where the previous code used two
different kvm_mmu structs depending on whether the walk included nested
EPT/NPT or not. Make page fault vmexits reuse the permission checking
machinery that is used for guest page faults. This is both a cleanup
and a baby step towards supporting XS/XU memory permissions.
* Document some of the "fun" gotchas with the APIC base when creating IRQCHIPs
on x86.
* Remove a defunct masterclock update from kvm_xen_shared_info_init(). It
could result in incorrect kvmclock due to triggering an unnecessary
switch to/from masterclock mode.
* Skip Xen runstate time updates if time has effectively gone backwards, so
that the guest doesn't report 100% steal time for a very, very long time.
* Drop KVM's runtime updates of the Xen PV timing CPUID leaf, as KVM was
updating the wrong sub-leaf, and upstream KVM will soon provide all the
information needed by userspace to populate the CPUID field itself.
* Fix a bug where KVM would walk a newly created rmap without holding the rmap
lock (or mmu_lock) during aging.
* Fix a bug where aging TDP MMU SPTEs could clobber FROZEN SPTEs.
* Fix a variety of #DB priority bugs.
* Fix a class of races related to enabling Hyper-V emulation on a vCPU after
the vCPU is visible to the rest of KVM.
* Use static calls for nested virtualization ops.
* Move more KVM-internal code out of x86's kvm_host.h.
* Enumerate support for a variety of Zhaoxin instructions that don't require
explicit virtualization.
* Fix missing EFER validation bugs, including in the KVM_SET_SREGS* path.
* Harden kvm_vcpu_map() against double-mapping and thus leaking references.
* Misc fixes and cleanups, e.g. for largely benign syzkaller splats.
x86 (Intel):
* Zero a vCPU's entry in VMX's Posted Interrupt Descriptor table used for IPI
virtualization when the vCPU is freed, to fix a use-after-free where hardware
will write to a freed vCPU's PID.
* Service local TLB flushes on a failed nested VM-Enter to fix a bug where KVM
could miss a TLB on a future, successful VM-Enter with the same L2 VPID.
* Cap the maximum value shoved into the VMX Preemption Timer to workaround an
erratum that affects all existing Intel CPUs that support CPUID 0x15.
* Fix VPID virtualization bugs where KVM would fail to flush hardware TLBs.
* Harden the TDX "populate" ioctls against bad input, and to prepare
for supporting in-place private<=>shared conversion.
x86 (AMD):
* Forcefully invalidate SNP VMSA pages if their backing guest_memfd page is
zapped/invalidated, e.g. due to a PUNCH_HOLE in response to a Page-State
Change request.
* Remove a dying VM from the GA Log notifier list before the VM is actually
destroyed, to fix a potential use-after-free.
* While FOLL_WRITE was needed in the past to trigger CoW unsharing, nowadays
FOLL_LONGTERM does that already even without FOLL_WRITE, and in fact,
get_user_pages() actually disallows FOLL_WRITE together with FOLL_LONGTERM.
So don't pass FOLL_WRITE when registering encrypted memory regions, i.e. when
pinning SEV/SEV-ES guest memory, to fix a regression with file-backed memory
introduced by KVM's (correct) usage of long-term pins.
(This was reviewed by mm maintainers; for more information, see commit
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| MAINTAINERS | ||
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| README | ||
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