kernel/tools/testing/selftests/kvm/x86, branch linux-rolling-stable

selftests: kvm: Verify TILELOADD actually #NM faults when XFD[18]=1

2026-01-10T06:17:30Z

Rework the AMX test's #NM handling to use kvm_asm_safe() to verify an #NM actually occurs. As is, a completely missing #NM could go unnoticed. Signed-off-by: Sean Christopherson Signed-off-by: Paolo Bonzini

selftests: kvm: try getting XFD and XSAVE state out of sync

2026-01-10T06:17:30Z

The host is allowed to set FPU state that includes a disabled xstate component. Check that this does not cause bad effects. Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini

selftests: kvm: replace numbered sync points with actions

2026-01-10T06:17:29Z

Rework the guest=>host syncs in the AMX test to use named actions instead of arbitrary, incrementing numbers. The "stage" of the test has no real meaning, what matters is what action the test wants the host to perform. The incrementing numbers are somewhat helpful for triaging failures, but fully debugging failures almost always requires a much deeper dive into the test (and KVM). Using named actions not only makes it easier to extend the test without having to shift all sync point numbers, it makes the code easier to read. [Commit message by Sean Christopherson] Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini

Merge tag 'kvm-x86-fixes-6.19-rc1' of https://github.com/kvm-x86/linux into HEAD

2025-12-18T17:38:45Z

KVM fixes for 6.19-rc1 - Add a missing "break" to fix param parsing in the rseq selftest. - Apply runtime updates to the _current_ CPUID when userspace is setting CPUID, e.g. as part of vCPU hotplug, to fix a false positive and to avoid dropping the pending update. - Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot, as it's not supported by KVM and leads to a use-after-free due to KVM failing to unbind the memslot from the previously-associated guest_memfd instance. - Harden against similar KVM_MEM_GUEST_MEMFD goofs, and prepare for supporting flags-only changes on KVM_MEM_GUEST_MEMFD memlslots, e.g. for dirty logging. - Set exit_code[63:32] to -1 (all 0xffs) when synthesizing a nested SVM_EXIT_ERR (a.k.a. VMEXIT_INVALID) #VMEXIT, as VMEXIT_INVALID is defined as -1ull (a 64-bit value). - Update SVI when activating APICv to fix a bug where a post-activation EOI for an in-service IRQ would effective be lost due to SVI being stale. - Immediately refresh APICv controls (if necessary) on a nested VM-Exit instead of deferring the update via KVM_REQ_APICV_UPDATE, as the request is effectively ignored because KVM thinks the vCPU already has the correct APICv settings.

KVM: selftests: Add a CPUID testcase for KVM_SET_CPUID2 with runtime updates

2025-12-02T16:49:32Z

Add a CPUID testcase to verify that KVM allows KVM_SET_CPUID2 after (or in conjunction with) runtime updates. This is a regression test for the bug introduced by commit 93da6af3ae56 ("KVM: x86: Defer runtime updates of dynamic CPUID bits until CPUID emulation"), where KVM would incorrectly reject KVM_SET_CPUID due to a not handling a pending runtime update on the current CPUID, resulting in a false mismatch between the "old" and "new" CPUID entries. Link: https://lore.kernel.org/all/20251128123202.68424a95@imammedo Link: https://patch.msgid.link/20251202015049.1167490-3-seanjc@google.com Signed-off-by: Sean Christopherson

Merge tag 'kvm-x86-selftests-6.19' of https://github.com/kvm-x86/linux into HEAD

2025-11-26T08:35:40Z

KVM selftests changes for 6.19: - Fix a math goof in mmu_stress_test when running on a single-CPU system/VM. - Forcefully override ARCH from x86_64 to x86 to play nice with specifying ARCH=x86_64 on the command line. - Extend a bunch of nested VMX to validate nested SVM as well. - Add support for LA57 in the core VM_MODE_xxx macro, and add a test to verify KVM can save/restore nested VMX state when L1 is using 5-level paging, but L2 is not. - Clean up the guest paging code in anticipation of sharing the core logic for nested EPT and nested NPT.

KVM: selftests: Stop using __virt_pg_map() directly in tests

2025-11-21T18:15:14Z

Replace __virt_pg_map() calls in tests by high-level equivalent functions, removing some loops in the process. No functional change intended. Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20251021074736.1324328-11-yosry.ahmed@linux.dev Signed-off-by: Sean Christopherson

KVM: selftests: Add a VMX test for LA57 nested state

2025-11-21T00:21:52Z

Add a selftest that verifies KVM's ability to save and restore nested state when the L1 guest is using 5-level paging and the L2 guest is using 4-level paging. Specifically, canonicality tests of the VMCS12 host-state fields should accept 57-bit virtual addresses. Signed-off-by: Jim Mattson Link: https://patch.msgid.link/20251028225827.2269128-5-jmattson@google.com [sean: rename to vmx_nested_la57_state_test to prep nested_ namespace] Signed-off-by: Sean Christopherson

KVM: selftests: Remove the unused argument to prepare_eptp()

2025-11-21T00:19:57Z

eptp_memslot is unused, remove it. No functional change intended. Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20251021074736.1324328-10-yosry.ahmed@linux.dev Signed-off-by: Sean Christopherson

KVM: selftests: Stop hardcoding PAGE_SIZE in x86 selftests

2025-11-21T00:19:56Z

Use PAGE_SIZE instead of 4096. Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20251021074736.1324328-9-yosry.ahmed@linux.dev Signed-off-by: Sean Christopherson