Fix a NULL pointer deref due to exposing Hyper-V enlightments to a guest without an in-kernel local APIC (found by syzkaller, highly unlikely to affect any "real" VMMs). Expand the Hyper-V CPUID test to verify that KVM doesn't incorrectly advertise support. v2 - Fix the stable@ email. Hilariously, I was _this_ close to sending this with stable@vger.kernel@xxxxxxxxxx instead of stable@xxxxxxxxxxxxxxx, *after* I wrote this exact blurb about fat-fingering the email a second time. Thankfully, git send-email told me I was being stupid :-) - Don't free the system-scoped CPUID entries object. [Vitaly] - Collect reviews. [Vitaly] v1: https://lore.kernel.org/all/20250113222740.1481934-1-seanjc@xxxxxxxxxx Sean Christopherson (4): KVM: x86: Reject Hyper-V's SEND_IPI hypercalls if local APIC isn't in-kernel KVM: selftests: Mark test_hv_cpuid_e2big() static in Hyper-V CPUID test KVM: selftests: Manage CPUID array in Hyper-V CPUID test's core helper KVM: selftests: Add CPUID tests for Hyper-V features that need in-kernel APIC arch/x86/kvm/hyperv.c | 6 ++- .../selftests/kvm/x86_64/hyperv_cpuid.c | 47 +++++++++++++------ 2 files changed, 37 insertions(+), 16 deletions(-) base-commit: a5546c2f0dc4f84727a4bb8a91633917929735f5 -- 2.48.0.rc2.279.g1de40edade-goog
