linux/tools/testing/selftests/kvm/lib, branch master

Merge tag 'kvm-s390-next-7.1-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

2026-04-13T17:01:15Z

- ESA nesting support - 4k memslots - LPSW/E fix

Merge tag 'kvm-x86-nested-7.1' of https://github.com/kvm-x86/linux into HEAD

2026-04-13T11:01:50Z

KVM nested SVM changes for 7.1 (with one common x86 fix) - To minimize the probability of corrupting guest state, defer KVM's non-architectural delivery of exception payloads (e.g. CR2 and DR6) until consumption of the payload is imminent, and force delivery of the payload in all paths where userspace saves relevant state. - Use vcpu->arch.cr2 when updating vmcb12's CR2 on nested #VMEXIT to fix a bug where L2's CR2 can get corrupted after a save/restore, e.g. if the VM is migrated while L2 is faulting in memory. - Fix a class of nSVM bugs where some fields written by the CPU are not synchronized from vmcb02 to cached vmcb12 after VMRUN, and so are not up-to-date when saved by KVM_GET_NESTED_STATE. - Fix a class of bugs where the ordering between KVM_SET_NESTED_STATE and KVM_SET_{S}REGS could cause vmcb02 to be incorrectly initialized after save+restore. - Add a variety of missing nSVM consistency checks. - Fix several bugs where KVM failed to correctly update VMCB fields on nested #VMEXIT. - Fix several bugs where KVM failed to correctly synthesize #UD or #GP for SVM-related instructions. - Add support for save+restore of virtualized LBRs (on SVM). - Refactor various helpers and macros to improve clarity and (hopefully) make the code easier to maintain. - Aggressively sanitize fields when copying from vmcb12 to guard against unintentionally allowing L1 to utilize yet-to-be-defined features. - Fix several bugs where KVM botched rAX legality checks when emulating SVM instructions. Note, KVM is still flawed in that KVM doesn't address size prefix overrides for 64-bit guests; this should probably be documented as a KVM erratum. - Fail emulation of VMRUN/VMLOAD/VMSAVE if mapping vmcb12 fails instead of somewhat arbitrarily synthesizing #GP (i.e. don't bastardize AMD's already- sketchy behavior of generating #GP if for "unsupported" addresses). - Cache all used vmcb12 fields to further harden against TOCTOU bugs.

Merge tag 'kvm-x86-selftests-7.1' of https://github.com/kvm-x86/linux into HEAD

2026-04-13T09:53:46Z

KVM selftests changes for 7.1 - Add support for Hygon CPUs in KVM selftests. - Fix a bug in the MSR test where it would get false failures on AMD/Hygon CPUs with exactly one of RDPID or RDTSCP. - Add an MADV_COLLAPSE testcase for guest_memfd as a regression test for a bug where the kernel would attempt to collapse guest_memfd folios against KVM's will.

Merge tag 'loongarch-kvm-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD

2026-04-13T09:46:11Z

LoongArch KVM changes for v7.1 1. Use CSR_CRMD_PLV in kvm_arch_vcpu_in_kernel(). 2. Let vcpu_is_preempted() a macro & some enhanments. 3. Add DMSINTC irqchip in kernel support. 4. Add KVM PMU test cases for tools/selftests.

KVM: LoongArch: selftests: Add basic PMU event counting test

2026-04-09T10:56:37Z

Introduce a basic PMU test that verifies hardware event counting for four performance counters. The test enables the events for CPU cycles, instructions retired, branch instructions, and branch misses, runs a fixed number of loops, and checks that the counter values fall within expected ranges. It also validates that the host supports PMU and that the VM feature is enabled. Signed-off-by: Song Gao Signed-off-by: Huacai Chen

KVM: LoongArch: selftests: Add cpucfg read/write helpers

2026-04-09T10:56:37Z

Add helper macros and functions to read and write CPU configuration registers (cpucfg) from the guest and from the VMM. This interface is required in upcoming selftests for querying and setting CPU features, such as PMU capabilities. Signed-off-by: Song Gao Signed-off-by: Huacai Chen

KVM: selftests: Remove 1M alignment requirement for s390

2026-04-07T15:07:27Z

Remove the 1M memslot alignment requirement for s390, since it is not needed anymore. Reviewed-by: Steffen Eiden Signed-off-by: Claudio Imbrenda

KVM: riscv: selftests: Implement kvm_arch_has_default_irqchip

2026-04-02T16:01:15Z

kvm_arch_has_default_irqchip is required for irqfd_test and returns true if an in-kernel interrupt controller is supported. Fixes: a133052666bed ("KVM: selftests: Fix irqfd_test for non-x86 architectures") Signed-off-by: Mayuresh Chitale Link: https://lore.kernel.org/r/20260402101818.2982071-1-mayuresh.chitale@oss.qualcomm.com Signed-off-by: Anup Patel

selftests: kvm: extract common functionality out of smm_test.c

2026-03-11T17:41:12Z

Signed-off-by: Paolo Bonzini

KVM: SVM: Rename vmcb->nested_ctl to vmcb->misc_ctl

2026-03-05T00:09:03Z

The 'nested_ctl' field is misnamed. Although the first bit is for nested paging, the other defined bits are for SEV/SEV-ES. Other bits in the same field according to the APM (but not defined by KVM) include "Guest Mode Execution Trap", "Enable INVLPGB/TLBSYNC", and other control bits unrelated to 'nested'. There is nothing common among these bits, so just name the field misc_ctl. Also rename the flags accordingly. Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20260303003421.2185681-19-yosry@kernel.org Signed-off-by: Sean Christopherson