From d9c41dc531b0e8feb046ee3d31ce37657101b137 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 22 May 2026 10:35:26 -0700 Subject: [PATCH] KVM: selftests: Verify that KVM returns the configured APIC cycle length Add checks in the APIC bus clock test to verify that querying KVM_CAP_X86_APIC_BUS_CYCLES_NS on the VM after changing the frequency returns the VM's actual APIC cycle length, not KVM's default. For giggles, verify that KVM still returns its default frequency for the system-scoped check. Signed-off-by: Sean Christopherson Message-ID: <20260522173526.3539407-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- tools/testing/selftests/kvm/x86/apic_bus_clock_test.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/kvm/x86/apic_bus_clock_test.c b/tools/testing/selftests/kvm/x86/apic_bus_clock_test.c index 404f0028e110..0c84c27ea584 100644 --- a/tools/testing/selftests/kvm/x86/apic_bus_clock_test.c +++ b/tools/testing/selftests/kvm/x86/apic_bus_clock_test.c @@ -137,6 +137,10 @@ static void run_apic_bus_clock_test(u64 apic_hz, u64 delay_ms, vm_enable_cap(vm, KVM_CAP_X86_APIC_BUS_CYCLES_NS, NSEC_PER_SEC / apic_hz); + TEST_ASSERT_EQ(kvm_check_cap(KVM_CAP_X86_APIC_BUS_CYCLES_NS), 1); + TEST_ASSERT_EQ(vm_check_cap(vm, KVM_CAP_X86_APIC_BUS_CYCLES_NS), + NSEC_PER_SEC / apic_hz); + vcpu = vm_vcpu_add(vm, 0, apic_guest_code); vcpu_args_set(vcpu, 2, apic_hz, delay_ms);