kernel/git/stable/linux.git/tools/testing/selftests/kvm, branch master

Merge tag 'kvmarm-7.3' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

2026-08-24T16:42:07+00:00

KVM/arm64 changes for 7.3 - 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)

Merge branch 'kvm-arm64/feat-nv3' into next

2026-08-19T19:27:53+00:00

* kvm-arm64/feat-nv3: (29 commits) : Support for FEAT_NV2p1 and FEAT_NV3, courtesy of Marc Zyngier : : Couple of accelerations for nested virtualization: : : - Elide traps for EL1 alias registers when hardware guarantees that : EL2-only bits are stateful (NV2p1) : : - Use TGE-aware hardware to avoid unnecesary ERET/TLBI traps that : remain 'in-context' (i.e. L1 kernel/userspace) arm64: Add override for ID_AA64MMFR4_EL1.NV_frac KVM: arm64: selftest: Add NVHCR_EL2 to get-reg-list KVM: arm64: Expose FEAT_NV3 to guests KVM: arm64: Add FEAT_NV3 detection KVM: arm64: Engage NV3 TLBI trap elision KVM: arm64: Engage NV3 ERET trap elision KVM: arm64: Add NVHCR_EL2 context switching KVM: arm64: Add routing for NVHCR_EL2 trap KVM: arm64: Add NVHCR_EL2 handling to the sysreg array KVM: arm64: Add sanitisation for NVHCR_EL2 KVM: arm64: Make HCR_EL2 a non-VNCR register KVM: arm64: Add kvm_has_nv{2,3}() predicates KVM: arm64: Add NV3 control bits to HCRX_EL2 sanitisation KVM: arm64: Split NV-specific exit fixups from the non-NV handling arm64: Add ARM64_HAS_NV3 capability arm64: sysreg: Add HCRX_EL2 bits related to FEAT_NV3 arm64: sysreg: Add NVHCR_EL2 description as a mirror of HCR_EL2 arm64: Add FEAT_NV2p1 detection KVM: arm64: Expose FEAT_NV2p1 to NV guests KVM: arm64: Relax CNTHCTL_EL2 handling when FEAT_NV2p1 is present ... Signed-off-by: Oliver Upton

Merge branch 'kvm-arm64/pkvm-7.3' into next

2026-08-19T19:27:35+00:00

* kvm-arm64/pkvm-7.3: (26 commits) : pKVM updates for 7.3 : : - Avoid name collision on trace_clock() when CONFIG_NVHE_EL2_TRACING is : disabled (Mostafa Saleh) : : - Clean up state tracking for whether the EL2 shadow VM has been : created (Fuad Tabba) : : - Synchronize SCTLR_EL1 when injecting an exception to use current : PAN/SSBS state (Fuad Tabba) : : - Avoid unnecessary cache maintenance when I/D-cache are known to be : coherent in pKVM (Mostafa Saleh) : : - Lazy vCPU context save/restore for pKVM (Fuad Tabba) : : - Various fixes to the stage-2 MMU for pKVM (Fuad Tabba) : : - Allow counter offsetting of non-protected guests in protected mode : (Mostafa Saleh) : : - Condition the 'broken CNTVOFF' mitigation on a VM actually having a : nonzero offset, fixing boot failures of pVMs on affected hardware : (Mostafa Saleh) KVM: arm64: Fix hvhe and broken CNTVOFF_EL2 KVM: arm64: Fix timer offsets for non-protected VMs KVM: arm64: Make timer_get_offset() work in all contexts KVM: arm64: selftests: Add stage-2 block transition test KVM: arm64: Don't advertise eager page splitting under pKVM KVM: arm64: Don't WARN on pKVM stage-2 map failures KVM: arm64: Skip pKVM stage-2 flush when FWB is enabled KVM: arm64: Top up stage-2 memcache for dirty logging faults KVM: arm64: Top up the memcache for pKVM permission faults KVM: arm64: Skip cache maintenance for non-cacheable pKVM mappings KVM: arm64: Implement lazy vCPU state sync for non-protected guests KVM: arm64: Add primitives to flush/sync the VGIC state at EL2 KVM: arm64: Minimise EL2's exposure of host VGIC state during world switch KVM: arm64: Add host and hypervisor vCPU lookup primitives KVM: arm64: Move PSCI helper functions to a shared header KVM: arm64: Factor out reusable vCPU reset helpers KVM: arm64: Make vcpu_{read,write}_sys_reg available to HYP code KVM: arm64: Extract MPIDR computation into a shared header KVM: arm64: selftests: Add a userspace watchpoint test KVM: arm64: Flush external_mdscr_el1 to the pKVM hyp vCPU ... Signed-off-by: Oliver Upton

Merge branch 'kvm-arm64/pmu-7.3' into next

2026-08-19T19:27:30+00:00

* kvm-arm64/pmu-7.3: : vPMU updates for 7.3 : : - Support for slot-based PMU events, relying on new UAPI that makes : selection of a vPMU implementation mandatory (Congkai Tan) KVM: arm64: Add KVM_ARM_VCPU_PMU_V3_STRICT vCPU feature KVM: arm64: Ignore writes to PMCR_EL0.N when using strict UAPI KVM: arm64: Advertise STALL_SLOT* in PMCEID1 under strict PMUv3 UAPI KVM: arm64: Expose PMMIR_EL1.SLOTS under strict PMUv3 UAPI Signed-off-by: Oliver Upton

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

2026-08-18T11:41:51+00:00

KVM x86 misc changes for 7.3 - Fix VPID virtualization bugs where KVM would fail to flush hardware TLBs. - Harden the SNP and TDX "populate" ioctls against bad input, and to prepare for supporting in-place private<=>shared conversion. - 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.

Merge tag 'kvm-x86-selftests2-7.3' of https://github.com/kvm-x86/linux into HEAD

2026-08-18T11:24:04+00:00

KVM selftests changes for 7.3, part 2 - Fix several issues with seeding KVM's 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.

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

2026-08-18T11:16:16+00:00

KVM selftests changes for 7.3, part 1 - 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

Merge tag 'loongarch-kvm-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD

2026-08-18T11:11:45+00:00

LoongArch KVM changes for v7.3 1. Advertise already-supported capabilities. 2. Some bug fixes about timer and MMIO. 3. Some hardening about interrupt injection. 4. Replace kvm_err() with kvm_pr_unimpl(). 5. Add FPU/LSX/LASX test cases for selftests.

Merge tag 'kvm-riscv-7.3-1' of https://github.com/kvm-riscv/linux into HEAD

2026-08-18T11:09:51+00:00

KVM/riscv changes for 7.3 - 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 for KVM RISC-V - 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

KVM: selftests: Create one VM with many vCPUs for each major PMU counters test

2026-08-10T15:04:13+00:00

To reduce the runtime of the PMU counters test by an order of magnitude, create one VM per category of test (arch events, GP PMCs, fixed PMCs), with N vCPUs per VM, where 'N' is the number of testscases to run per category. The vast majority of the test's runtime is spent creating VMs, because while creating a VM only takes a few milliseconds, the total time adds up when creating hundreds of VMs. The only reason the test creates so many VMs is because KVM disallows changing the virtual PMU model after a vCPU runs, so rather than create an entirely new VM just to get a "fresh" vCPUs, simply use a different vCPU. On an Emerald Rapids host, this reduces the runtime from 75+ seconds to less than 6 seconds. Opportunistically fix a typo in the comment about unavailable_masks pointed out by Like Xu[1]. Link: https://lore.kernel.org/all/20260625090155.6326-1-likexu@tencent.com[1] Link: https://patch.msgid.link/20260804210046.3413149-3-seanjc@google.com Signed-off-by: Sean Christopherson