Changes in Kconfig

9e5dd49de5d82401e92098c03e0a0e978ddd515a - KVM: arm64: tracing: add ftrace dependency

Thu, 12 Mar 2026 13:35:44 +0100

KVM: arm64: tracing: add ftrace dependencySelecting CONFIG_TRACE_REMOTE causes a build time warning when FTRACEis disabled:WARNING: unmet direct dependencies detected for TRACE_REMOTE Depends on [n]: FTRACE [=n] Selected by [y]: - NVHE_EL2_TRACING [=y] && VIRTUALIZATION [=y] && KVM [=y] && NVHE_EL2_DEBUG [=y] && TRACING [=y]Add this as another dependency to ensure a clean build.Fixes: 3aed038aac8d ("KVM: arm64: Add trace remote for the nVHE/pKVM hyp")Signed-off-by: Arnd Bergmann Reviewed-by: Vincent Donnefort Link: https://patch.msgid.link/20260312123601.625063-3-arnd@kernel.orgSigned-off-by: Marc Zyngier List of files: /linux/arch/arm64/kvm/Kconfig

3aed038aac8d897016a2b6e1935f16c7640918d4 - KVM: arm64: Add trace remote for the nVHE/pKVM hyp

Mon, 09 Mar 2026 17:25:10 +0100

KVM: arm64: Add trace remote for the nVHE/pKVM hypIn both protected and nVHE mode, the hypervisor is capable of writingevents into tracefs compatible ring-buffers. Create a trace remote sothe kernel can read those buffers.This currently doesn't provide any event support which will come later.Signed-off-by: Vincent Donnefort Link: https://patch.msgid.link/20260309162516.2623589-25-vdonnefort@google.comSigned-off-by: Marc Zyngier List of files: /linux/arch/arm64/kvm/Kconfig

680a04c333fa29bf92007efe11431be005e8c4bb - KVM: arm64: Add tracing capability for the nVHE/pKVM hyp

Mon, 09 Mar 2026 17:25:09 +0100

KVM: arm64: Add tracing capability for the nVHE/pKVM hypThere is currently no way to inspect or log what's happening at EL2when the nVHE or pKVM hypervisor is used. With the growing set offeatures for pKVM, the need for tooling is more pressing. And tracefs,by its reliability, versatility and support for user-space is fit forpurpose.Add support to write into a tracefs compatible ring-buffer. There's noway the hypervisor could log events directly into the host tracefsring-buffers. So instead let's use our own, where the hypervisor is thewriter and the host the reader.Signed-off-by: Vincent Donnefort Link: https://patch.msgid.link/20260309162516.2623589-24-vdonnefort@google.comSigned-off-by: Marc Zyngier List of files: /linux/arch/arm64/kvm/Kconfig

9019e82c7e46c03c37e8b108473d02b543222d9f - KVM: arm64: Add PKVM_DISABLE_STAGE2_ON_PANIC

Mon, 09 Mar 2026 17:25:05 +0100

KVM: arm64: Add PKVM_DISABLE_STAGE2_ON_PANICOn NVHE_EL2_DEBUG, when using pKVM, the host stage-2 is relaxed to grantthe kernel access to the stacktrace, hypervisor bug table and text tosymbolize addresses. This is unsafe for production. In preparation foradding more debug options to NVHE_EL2_DEBUG, decouple the stage-2relaxation into a separate option.While at it, rename PROTECTED_NVHE_STACKTRACE into PKVM_STACKTRACE,following the same naming scheme as PKVM_DISABLE_STAGE2_ON_PANIC.Reviewed-by: Kalesh Singh Signed-off-by: Vincent Donnefort Link: https://patch.msgid.link/20260309162516.2623589-20-vdonnefort@google.comSigned-off-by: Marc Zyngier List of files: /linux/arch/arm64/kvm/Kconfig

407fd8b8d8cce03856aa67329715de48b254b529 - KVM: remove CONFIG_KVM_GENERIC_MMU_NOTIFIER

Wed, 11 Feb 2026 19:03:03 +0100

KVM: remove CONFIG_KVM_GENERIC_MMU_NOTIFIERAll architectures now use MMU notifier for KVM page table management.Remove the Kconfig symbol and the code that is used when it isdisabled.Signed-off-by: Paolo Bonzini List of files: /linux/arch/arm64/kvm/Kconfig

221533629550e920580ab428f13ffebf54063b95 - Merge tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Tue, 07 Oct 2025 17:40:15 +0200

Merge tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linuxPull hyperv updates from Wei Liu: - Unify guest entry code for KVM and MSHV (Sean Christopherson) - Switch Hyper-V MSI domain to use msi_create_parent_irq_domain() (Nam Cao) - Add CONFIG_HYPERV_VMBUS and limit the semantics of CONFIG_HYPERV (Mukesh Rathor) - Add kexec/kdump support on Azure CVMs (Vitaly Kuznetsov) - Deprecate hyperv_fb in favor of Hyper-V DRM driver (Prasanna Kumar T S M) - Miscellaneous enhancements, fixes and cleanups (Abhishek Tiwari, Alok Tiwari, Nuno Das Neves, Wei Liu, Roman Kisel, Michael Kelley)* tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: hyperv: Remove the spurious null directive line MAINTAINERS: Mark hyperv_fb driver Obsolete fbdev/hyperv_fb: deprecate this in favor of Hyper-V DRM driver Drivers: hv: Make CONFIG_HYPERV bool Drivers: hv: Add CONFIG_HYPERV_VMBUS option Drivers: hv: vmbus: Fix typos in vmbus_drv.c Drivers: hv: vmbus: Fix sysfs output format for ring buffer index Drivers: hv: vmbus: Clean up sscanf format specifier in target_cpu_store() x86/hyperv: Switch to msi_create_parent_irq_domain() mshv: Use common "entry virt" APIs to do work in root before running guest entry: Rename "kvm" entry code assets to "virt" to genericize APIs entry/kvm: KVM: Move KVM details related to signal/-EINTR into KVM proper mshv: Handle NEED_RESCHED_LAZY before transferring to guest x86/hyperv: Add kexec/kdump support on Azure CVMs Drivers: hv: Simplify data structures for VMBus channel close message Drivers: hv: util: Cosmetic changes for hv_utils_transport.c mshv: Add support for a new parent partition configuration clocksource: hyper-v: Skip unnecessary checks for the root partition hyperv: Add missing field to hv_output_map_device_interrupt List of files: /linux/arch/arm64/kvm/Kconfig

9be7e1e320ff2e7db4b23c8ec5f599bbfac94ede - entry: Rename "kvm" entry code assets to "virt" to genericize APIs

Thu, 28 Aug 2025 02:01:54 +0200

entry: Rename "kvm" entry code assets to "virt" to genericize APIsRename the "kvm" entry code files and Kconfigs to use generic "virt"nomenclature so that the code can be reused by other hypervisors (orrather, their root/dom0 partition drivers), without incorrectly suggestingthe code somehow relies on and/or involves KVM.No functional change intended.Signed-off-by: Sean Christopherson Reviewed-by: Thomas Gleixner Reviewed-by: Joel Fernandes Signed-off-by: Wei Liu List of files: /linux/arch/arm64/kvm/Kconfig

32e200bd6e4407c31aef0392be041274bfa3f20e - KVM: arm64: Enable support for guest_memfd backed memory

Wed, 30 Jul 2025 00:54:51 +0200

KVM: arm64: Enable support for guest_memfd backed memoryNow that the infrastructure is in place, enable guest_memfd for arm64.* Select CONFIG_KVM_GUEST_MEMFD in KVM/arm64 Kconfig.* Enforce KVM_MEMSLOT_GMEM_ONLY for guest_memfd on arm64: Ensure that guest_memfd-backed memory slots on arm64 are only supported if they are intended for shared memory use cases (i.e., kvm_memslot_is_gmem_only() is true). This design reflects the current arm64 KVM ecosystem where guest_memfd is primarily being introduced for VMs that support shared memory.Reviewed-by: James Houghton Reviewed-by: Gavin Shan Reviewed-by: Marc Zyngier Acked-by: David Hildenbrand Signed-off-by: Fuad Tabba Signed-off-by: Sean Christopherson Message-ID: <20250729225455.670324-21-seanjc@google.com>Signed-off-by: Paolo Bonzini List of files: /linux/arch/arm64/kvm/Kconfig

2555d4c6872085584bda55d1c2bc048cae5fb0b3 - arm64: drop binutils version checks

Fri, 28 Mar 2025 22:17:40 +0100

arm64: drop binutils version checksNow that gcc-8 and binutils-2.30 are the minimum versions, a lot ofthe individual feature checks can go away for simplification.Acked-by: Mark Rutland Signed-off-by: Arnd Bergmann List of files: /linux/arch/arm64/kvm/Kconfig

f9aad622006bd64c28fdf73c03a1c5139fcbf049 - mm: rename GENERIC_PTDUMP and PTDUMP_CORE

Wed, 26 Feb 2025 13:24:04 +0100

mm: rename GENERIC_PTDUMP and PTDUMP_COREPlatforms subscribe into generic ptdump implementation via GENERIC_PTDUMP.But generic ptdump gets enabled via PTDUMP_CORE. These configscombination is confusing as they sound very similar and does notdifferentiate between platform's feature subscription and featureenablement for ptdump. Rename the configs as ARCH_HAS_PTDUMP and PTDUMPmaking it more clear and improve readability.Link: https://lkml.kernel.org/r/20250226122404.1927473-6-anshuman.khandual@arm.comSigned-off-by: Anshuman Khandual Reviewed-by: Christophe Leroy (powerpc)Acked-by: Catalin Marinas [arm64]Cc: Will Deacon Cc: Jonathan Corbet Cc: Marc Zyngier Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Christophe Leroy Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Steven Price Signed-off-by: Andrew Morton List of files: /linux/arch/arm64/kvm/Kconfig

f625469051266311e19245ef427f23a6a3c3f4aa - Merge branch kvm-arm64/s2-ptdump into kvmarm-master/next

Thu, 12 Sep 2024 09:38:02 +0200

Merge branch kvm-arm64/s2-ptdump into kvmarm-master/next* kvm-arm64/s2-ptdump: : . : Stage-2 page table dumper, reusing the main ptdump infrastructure, : courtesy of Sebastian Ene. From the cover letter: : : "This series extends the ptdump support to allow dumping the guest : stage-2 pagetables. When CONFIG_PTDUMP_STAGE2_DEBUGFS is enabled, ptdump : registers the new following files under debugfs: : - /sys/debug/kvm//stage2_page_tables : - /sys/debug/kvm//stage2_levels : - /sys/debug/kvm//ipa_range : : This allows userspace tools (eg. cat) to dump the stage-2 pagetables by : reading the 'stage2_page_tables' file. : [...]" : . KVM: arm64: Register ptdump with debugfs on guest creation arm64: ptdump: Don't override the level when operating on the stage-2 tables arm64: ptdump: Use the ptdump description from a local context arm64: ptdump: Expose the attribute parsing functionality KVM: arm64: Move pagetable definitions to common headerSigned-off-by: Marc Zyngier List of files: /linux/arch/arm64/kvm/Kconfig

7c4f73548ed15476daf1101f66648085eda65067 - KVM: arm64: Register ptdump with debugfs on guest creation

Mon, 09 Sep 2024 14:47:21 +0200

KVM: arm64: Register ptdump with debugfs on guest creationWhile arch/*/mem/ptdump handles the kernel pagetable dumping code,introduce KVM/ptdump to show the guest stage-2 pagetables. Theseparation is necessary because most of the definitions from thestage-2 pagetable reside in the KVM path and we will be invokingfunctionality specific to KVM. Introduce the PTDUMP_STAGE2_DEBUGFS config.When a guest is created, register a new file entry under the guestdebugfs dir which allows userspace to show the contents of the gueststage-2 pagetables when accessed.[maz: moved function prototypes from kvm_host.h to kvm_mmu.h]Signed-off-by: Sebastian Ene Reviewed-by: Vincent Donnefort Link: https://lore.kernel.org/r/20240909124721.1672199-6-sebastianene@google.comSigned-off-by: Marc Zyngier List of files: /linux/arch/arm64/kvm/Kconfig

10f2ad032defe906240d0c3b62dcbceace96b230 - KVM: arm64: Enforce dependency on an ARMv8.4-aware toolchain

Wed, 07 Aug 2024 13:51:44 +0200

KVM: arm64: Enforce dependency on an ARMv8.4-aware toolchainWith the NV support of TLBI-range operations, KVM makes use ofinstructions that are only supported by binutils versions >= 2.30.This breaks the build for very old toolchains.Make KVM support conditional on having ARMv8.4 support in theassembler, side-stepping the issue.Fixes: 5d476ca57d7d ("KVM: arm64: nv: Add handling of range-based TLBI operations")Reported-by: Viresh Kumar Suggested-by: Arnd Bergmann Signed-off-by: Marc Zyngier Acked-by: Arnd Bergmann Link: https://lore.kernel.org/r/20240807115144.3237260-1-maz@kernel.orgSigned-off-by: Oliver Upton List of files: /linux/arch/arm64/kvm/Kconfig

82affc97affbdfe83c807ad17147a1220031fd90 - Revert "KVM: arm64: Snapshot all non-zero RES0/RES1 sysreg fields for later checking"

Sat, 16 Mar 2024 01:24:57 +0100

Revert "KVM: arm64: Snapshot all non-zero RES0/RES1 sysreg fields for later checking"This reverts commits 99101dda29e3186b1356b0dc4dbb835c02c71ac9 andb80b701d5a67d07f4df4a21e09cb31f6bc1feeca.Linus reports that the sysreg reserved bit checks in KVM have led tobuild failures, arising from commit fdd867fe9b32 ("arm64/sysreg: Addregister fields for ID_AA64DFR1_EL1") giving meaning to fields that werepreviously RES0.Of course, this is a genuine issue, since KVM's sysreg emulation dependsheavily on the definition of reserved fields. But at this point thebuild breakage is far more offensive, and the right course of action isto revert and retry later.All of these build-time assertions were on by default beforecommit 99101dda29e3 ("KVM: arm64: Make build-time check of RES0/RES1bits optional"), so deliberately revert it all atomically to avoidintroducing further breakage of bisection.Link: https://lore.kernel.org/all/CAHk-=whCvkhc8BbFOUf1ddOsgSGgEjwoKv77=HEY1UiVCydGqw@mail.gmail.com/Acked-by: Marc Zyngier Signed-off-by: Oliver Upton Signed-off-by: Linus Torvalds List of files: /linux/arch/arm64/kvm/Kconfig

961e2bfcf3784dbf76f3539211c699c11d7ba8c2 - Merge tag 'kvmarm-6.9' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

Mon, 11 Mar 2024 15:02:32 +0100

Merge tag 'kvmarm-6.9' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEADKVM/arm64 updates for 6.9 - Infrastructure for building KVM's trap configuration based on the architectural features (or lack thereof) advertised in the VM's ID registers - Support for mapping vfio-pci BARs as Normal-NC (vaguely similar to x86's WC) at stage-2, improving the performance of interacting with assigned devices that can tolerate it - Conversion of KVM's representation of LPIs to an xarray, utilized to address serialization some of the serialization on the LPI injection path - Support for _architectural_ VHE-only systems, advertised through the absence of FEAT_E2H0 in the CPU's ID register - Miscellaneous cleanups, fixes, and spelling corrections to KVM and selftests List of files: /linux/arch/arm64/kvm/Kconfig

7d8942d8e73843de35b3737b8be50f8fef6796bb - Merge tag 'kvm-x86-guest_memfd_fixes-6.8' of https://github.com/kvm-x86/linux into HEAD

Sat, 09 Mar 2024 17:48:35 +0100

Merge tag 'kvm-x86-guest_memfd_fixes-6.8' of https://github.com/kvm-x86/linux into HEADKVM GUEST_MEMFD fixes for 6.8: - Make KVM_MEM_GUEST_MEMFD mutually exclusive with KVM_MEM_READONLY to avoid creating ABI that KVM can't sanely support. - Update documentation for KVM_SW_PROTECTED_VM to make it abundantly clear that such VMs are purely a development and testing vehicle, and come with zero guarantees. - Limit KVM_SW_PROTECTED_VM guests to the TDP MMU, as the long term plan is to support confidential VMs with deterministic private memory (SNP and TDX) only in the TDP MMU. - Fix a bug in a GUEST_MEMFD negative test that resulted in false passes when verifying that KVM_MEM_GUEST_MEMFD memslots can't be dirty logged. List of files: /linux/arch/arm64/kvm/Kconfig

99101dda29e3186b1356b0dc4dbb835c02c71ac9 - KVM: arm64: Make build-time check of RES0/RES1 bits optional

Thu, 22 Feb 2024 15:12:09 +0100

KVM: arm64: Make build-time check of RES0/RES1 bits optionalIn order to ease the transition towards a state of absoluteparanoia where all RES0/RES1 bits gets checked against whatKVM know of them, make the checks optional and guarded by aconfig symbol (CONFIG_KVM_ARM64_RES_BITS_PARANOIA) default to n.Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/kvm/87frxka7ud.wl-maz@kernel.org/Signed-off-by: Oliver Upton List of files: /linux/arch/arm64/kvm/Kconfig

52571d058b0775d57c9d1bc62d8a19b2da51ef39 - KVM: arm64: Drop the requirement for XARRAY_MULTI

Wed, 14 Feb 2024 14:18:12 +0100

KVM: arm64: Drop the requirement for XARRAY_MULTINow that we don't use xa_store_range() anymore, drop the addedcomplexity of XARRAY_MULTI for KVM. It is likely still pulledin by other bits of the kernel though.Reviewed-by: Joey Gouly Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20240214131827.2856277-12-maz@kernel.orgSigned-off-by: Oliver Upton List of files: /linux/arch/arm64/kvm/Kconfig

687d8f4c3dea0758afd748968d91288220bbe7e3 - Merge branch 'kvm-kconfig'

Thu, 08 Feb 2024 14:47:06 +0100

Merge branch 'kvm-kconfig'Cleanups to Kconfig definitions for KVM* replace HAVE_KVM with an architecture-dependent symbol, when CONFIG_KVM may or may not be available depending on CPU capabilities (MIPS)* replace HAVE_KVM with IS_ENABLED(CONFIG_KVM) for host-side code that is not part of the KVM module, so that it is completely compiled out* factor common "select" statements in common code instead of requiring each architecture to specify it List of files: /linux/arch/arm64/kvm/Kconfig

f48212ee8e78f765917dc64a7ff4bd13c7e71384 - treewide: remove CONFIG_HAVE_KVM

Thu, 04 Jan 2024 17:34:25 +0100

treewide: remove CONFIG_HAVE_KVMIt has no users anymore.Signed-off-by: Paolo Bonzini List of files: /linux/arch/arm64/kvm/Kconfig