Changes in Kconfig

7bb6284aa7b3c369b41e7f33fcbe193161f008e7 - Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Tue, 25 Aug 2026 20:48:04 +0200

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmPull kvm updates from Paolo Bonzini: "ARM64: - 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 ee1a586dd1fa "KVM: SEV: Drop FOLL_WRITE for encrypted region registration") - Allocate full pages for SEV/SEV-ES {DE,EN}CRYPT ops on SNP-enabled hosts to fix a data corruption issue due to the PSP driver assigning to-be-written pages to firmware (as required by the SNP specs) - Unconditionally intercept ICBEP so that KVM generates the correct guest RIP when handling an ICEBP-induced TASK_SWITCH #VMEXIT - Harden the SNP "populate" ioctls against bad input, and to prepare for supporting in-place private<=>shared conversion Generic: - Remove kvm_debugfs_dir if kvm_init() fails after creating KVM's debugfs - Add a per-VM bitmap to track which vCPU IDs have been "claimed" but for which the vCPU isn't yet online, and use the bitmap to reject duplicate IDs before calling into arch code. This allows arch code to consume vcpu_id without having to worry about cross-vCPU clobbering (at least s390 and x86 have had related bugs) - Rework the so called "prepare" and "invalidate" guest_memfd hooks to prepare for in-place private<=>shared conversion, and clean up a few warts along the way Selftests: - Automatically allocate a full page for L2 guest stacks on x86 instead of requiring test-specific L1 guest code to carve out a portion of the L1 stack for L2 usage, and to ensure the L2 stack also adheres to the x86-64 calling convention ABI - Add a selftest to verify {Guest,Host}-Only behavior in x86's mediated PMU - Clean up nested SVM's handling of GPRs on L2<=>L1 transitions, reuse the functionality for nested VMX, and drop the ucall hack that was fudging around the lack of GPR switching on nVMX - Add a stress test to verify KVM doesn't clobber/drop #PF state, e.g. CR2, across save/restore, including when L2 is active - Add a test to verify KVM_CREATE_VM accepts exactly what is reported by KVM_CAP_VM_TYPES - Misc selftests fixes and cleanups - Fix several issues with seeding the pRNG, and rework the pRNG APIs to that the pRNG can be sanely used in host code, not just guest code - Add an IRQ test to validate virtual IRQ deliverty for IRQs wired up via KVM_IRQFD + KVM_SET_GSI_ROUTING, with optional support for triggering IRQs via writes to an assigned VFIO device - Add syscall wrappers to assert success on a variety of pthreads and CPU affinity APIs - Set vCPU pthread affinity as early as possible to reduce contention issues that were surfaced by PREEMPT_LAZY, which result in runtimes of over a minute on large hosts, versus the expected ~5 seconds - Rework the PMU counters test to run each testcase using a single VM with many vCPUs for each sub-testcase, instead of using a unique VM for each sub-testcase. This cuts the runtime by ~20x Miscellaneous: - MAINTAINERS updates for vfio-ap, guest_memfd, kvm-x86. Mostly representing the status quo more accurately, but also... welcome David Hildenbrand as guest_memfd reviewer!"* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (413 commits) KVM: arm64: Validate GICv5 timer PPIs before claiming ownership KVM: arm64: vgic: Reject out-of-range GICv5 PPI IDs KVM: arm64: vgic: Prevent speculative SPI array underflow KVM: arm64: vgic: Free gic_kvm_info on initialization failure KVM: arm64: Avoid mismatched accesses to 'struct kvm_nvhe_init_params' s390/vfio-ap: Fix NULL deref in status_show() during queue probe s390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove s390/vfio-ap: Fix required lock not held during update of ap_matrix_mdev object s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects s390/vfio-ap: Fix dereference matrix_mdev->kvm without checking for NULL s390/vfio-ap: Fix stale do_remove flag across iterations in vfio_ap_mdev_cfg_remove RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector riscv: vector: allow non-preemptible kernel-mode vector with IRQs off riscv: vector: refactor riscv_v_start_kernel_context KVM: s390: gmap: Make prefix handling optional KVM: s390: gmap: Make CMMA optional KVM: s390: gmap: Make storage keys optional KVM: s390: Prepare gmap for a second KVM implementation ... List of files: /linux/virt/kvm/Kconfig

159ed1ae35b16a2d4603742fc32a6616fe42a78a - Merge tag 'kvm-x86-coco-7.3' of https://github.com/kvm-x86/linux into HEAD

Tue, 18 Aug 2026 13:25:39 +0200

Merge tag 'kvm-x86-coco-7.3' of https://github.com/kvm-x86/linux into HEADKVM guest_memfd and x86 CoCo changes for 7.3 - 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. - Rework the so called "prepare" and "invalidate" guest_memfd hooks to prepare for in-place private<=>shared conversion, and clean up a few warts along the way. List of files: /linux/virt/kvm/Kconfig

2131c4f763d2e4cbbe5c227a406488c38e23f806 - KVM: guest_memfd: Rename prepare() hook and Kconfig to make_private() / CONVERT

Thu, 23 Jul 2026 23:08:09 +0200

KVM: guest_memfd: Rename prepare() hook and Kconfig to make_private() / CONVERTRework guest_memfd's prepare() hook into a more accurate make_private(),and rework its Kconfig from PREPARE to a more generic CONVERT. This willallow x86 to share (pun intended) a kvm_x86_ops.gmem_make_shared() hookbetween the "convert to shared" and "reclaim" flows, which are one and thesame for SNP.No functional change intended.Reviewed-by: Ackerley Tng Reviewed-by: Fuad Tabba Link: https://patch.msgid.link/20260723210811.72720-8-seanjc@google.comSigned-off-by: Sean Christopherson List of files: /linux/virt/kvm/Kconfig

7b8529e70a11ed110a15568f6b391a5f32eef67f - KVM: guest_memfd: Rename invalidate() arch hook to reclaim() and isolate it

Thu, 23 Jul 2026 23:08:04 +0200

KVM: guest_memfd: Rename invalidate() arch hook to reclaim() and isolate itRename guest_memfd's invalidate() hook to reclaim() and isolate it via itsown RECLAIM Kconfig, as the hook is called when a folio is freed, which isfar too late and lacks sufficient information for KVM to actuallyinvalidate its usage of the memory. E.g. SNP uses the hook to convertmemory back to SHARED so that it can be safely accessed by the host, thereis no invalidation of guest mappings anywhere. Isolating the hook willalso allow pKVM on arm64 to opt-in to reclaim() without also having todifferentiate between reclaim and conversions to shared for active VMs.Keep guest_memfd's trampoline, even though it would be trivial to wire up.free_folio() directly to an arch callback, to avoid bleeding guest_memfdinternals into arch code (specifically, avoid referencing folios in archcode).Leave the kvm_x86_ops hook as-is for the moment, as "reclaim" on SNP isthe same as convert-to-shared, i.e. using a different name for the x86 hookwill allow reusing it for in-place conversion.Reviewed-by: Xiaoyao Li Reviewed-by: Fuad Tabba Reviewed-by: Ackerley Tng Link: https://patch.msgid.link/20260723210811.72720-3-seanjc@google.comSigned-off-by: Sean Christopherson List of files: /linux/virt/kvm/Kconfig

5c8cbca290acdd49a694b36c0af76ba0c00bbf12 - Merge branch '20260507-ubwc-rework-v4-4-c19593d20c1d@oss.qualcomm.com' of https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux into HEAD

Thu, 21 May 2026 22:36:50 +0200

Merge branch '20260507-ubwc-rework-v4-4-c19593d20c1d@oss.qualcomm.com' of https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux into HEADMerge the branch with the soc/qcom changes, required for the next UBWCpatches.Signed-off-by: Dmitry Baryshkov List of files: /linux/virt/kvm/Kconfig

8edf8b09fc44990977b3fbcb708035b1740d0b7e - Merge drm/drm-next into drm-intel-gt-next

Tue, 12 May 2026 10:16:35 +0200

Merge drm/drm-next into drm-intel-gt-nextBackmerging to pull in commit 5401b9adebc9 ("i915: don't usea vma that didn't match the context VM") to revert it.Signed-off-by: Joonas Lahtinen List of files: /linux/virt/kvm/Kconfig

1655f6895a896eb632ca8a019259bc5d358a9712 - Merge tag 'timers-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/daniel.lezcano/linux into timers/clocksource

Sun, 12 Apr 2026 22:33:39 +0200

Merge tag 'timers-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/daniel.lezcano/linux into timers/clocksource - Added the DT bindings for the compatible string 'fsl,imx25-epit' (Frank Li) - Made the rttm_cs variable static for the rtl otto timer driver (Krzysztof Kozlowski) - Fixed error return code handling in the sun5i timer driver (Chen Ni) - Made the timer-of and the mmio code compatible with modules (Daniel Lezcano)Link: https://lore.kernel.org/151feae1-39ba-4abd-a9f9-9bff377a2cd8@oss.qualcomm.com List of files: /linux/virt/kvm/Kconfig

4ab789c1b3c81eca56a3b1f7686f3c805add1e49 - Merge drm/drm-next into drm-intel-next

Mon, 30 Mar 2026 14:06:42 +0200

Merge drm/drm-next into drm-intel-nextBackmerge drm-next to sync up with drm and xe changes, in particularAuxCCS.Signed-off-by: Jani Nikula List of files: /linux/virt/kvm/Kconfig

d13e855ee923c2ae78307bf6c354305f1406b9e2 - Merge drm/drm-fixes into drm-misc-fixes

Thu, 23 Apr 2026 14:43:06 +0200

Merge drm/drm-fixes into drm-misc-fixesTomi needs 7.0 to apply a patch from drm-misc-fixes.Signed-off-by: Maxime Ripard List of files: /linux/virt/kvm/Kconfig

9e4e86a604dfd06402933467578c4b79f5412b2c - Merge tag 'v7.0-rc4' into togreg

Sun, 22 Mar 2026 13:20:42 +0100

Merge tag 'v7.0-rc4' into togregLinux 7.0-rc4Required for the ds4422 series which is build upon;5187e03b817c ("iio: dac: ds4424: reject -128 RAW value") List of files: /linux/virt/kvm/Kconfig

3812943e01fdeabd80118b01c1484f6bd4d324d9 - Merge 7.0-rc4 into char-misc-next

Mon, 16 Mar 2026 11:41:58 +0100

Merge 7.0-rc4 into char-misc-nextWe need the char/misc/iio fixes in this branch as well to build on topof.Signed-off-by: Greg Kroah-Hartman List of files: /linux/virt/kvm/Kconfig

f4b369c6fe0ceaba2da2daff8c9eb415f85926dd - Merge branch 'next' into for-linus

Mon, 20 Apr 2026 03:28:57 +0200

Merge branch 'next' into for-linusPrepare input updates for 7.1 merge window. List of files: /linux/virt/kvm/Kconfig

0421ccdfad0d92713a812a5aeb7d07b0ea7213c8 - Merge tag 'v7.0-rc3' into next

Thu, 12 Mar 2026 18:44:42 +0100

Merge tag 'v7.0-rc3' into nextSync up with the mainline to brig up the latest changes, specificallychanges to ALPS driver. List of files: /linux/virt/kvm/Kconfig

d4eb7b2da66c848709e31585b9c371fa234abc39 - Merge branch 'for-7.1/core-v2' into for-linus

Thu, 16 Apr 2026 21:01:18 +0200

Merge branch 'for-7.1/core-v2' into for-linus- fixed handling of 0-sized reports (Dmitry Torokhov)- convert core code to __free() (Dmitry Torokhov)- support for multiple batteries per HID device (Lucas Zampieri) List of files: /linux/virt/kvm/Kconfig

0542972950ef26670a5696e43c0ea2b7b6ac96d4 - Merge branch 'for-linus' into for-next

Wed, 01 Apr 2026 14:42:56 +0200

Merge branch 'for-linus' into for-nextPull 7.0 devel branch for further cleanups of ctxfi driver & co.Signed-off-by: Takashi Iwai List of files: /linux/virt/kvm/Kconfig

54fcc7f6ec3944ae7c1b0246a999744e33839cdb - Merge tag 'perf-tools-fixes-for-v7.0-2-2026-03-23' into perf-tools-next

Wed, 25 Mar 2026 08:06:23 +0100

Merge tag 'perf-tools-fixes-for-v7.0-2-2026-03-23' into perf-tools-nextTo get the various fixes for v7.0.Signed-off-by: Namhyung Kim List of files: /linux/virt/kvm/Kconfig

f6472b17933f9adb825e7c7da31f7b7b2edb1950 - Merge tag 'v7.0-rc4' into timers/core, to resolve conflict

Sat, 21 Mar 2026 08:02:36 +0100

Merge tag 'v7.0-rc4' into timers/core, to resolve conflictResolve conflict between this change in the upstream kernel: 4c652a47722f ("rseq: Mark rseq_arm_slice_extension_timer() __always_inline")... and this pending change in timers/core: 0e98eb14814e ("entry: Prepare for deferred hrtimer rearming")Signed-off-by: Ingo Molnar List of files: /linux/virt/kvm/Kconfig

de6c925db978004703944585e9dd57d58aba0fac - Merge 7.0-rc4 into usb-next

Mon, 16 Mar 2026 11:50:48 +0100

Merge 7.0-rc4 into usb-nextWe need the USB fixes in this branch as well to build on top ofSigned-off-by: Greg Kroah-Hartman List of files: /linux/virt/kvm/Kconfig

f3f5d52d6bcdf190891601a11910cdd596963c1e - Merge 7.0-rc4 into staging-next

Mon, 16 Mar 2026 11:47:14 +0100

Merge 7.0-rc4 into staging-nextWe need the staging driver fixes in here to build on top ofSigned-off-by: Greg Kroah-Hartman List of files: /linux/virt/kvm/Kconfig

76bce7ac51673640a4a46236ea723cf5543268d7 - Merge tag 'v7.0-rc4' into drm-rust-next

Sun, 15 Mar 2026 21:55:47 +0100

Merge tag 'v7.0-rc4' into drm-rust-nextWe need the latest fixes from drm-rust-fixes in drm-rust-next as well tobuild on top of.Signed-off-by: Danilo Krummrich List of files: /linux/virt/kvm/Kconfig