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KVM: selftests: Verify that KVM returns the configured APIC cycle length

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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 <seanjc@google.com>
Message-ID: <20260522173526.3539407-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2026-05-22 10:35:26 -07:00 committed by Paolo Bonzini
parent 86e2de10eb
commit d9c41dc531
1 changed files with 4 additions and 0 deletions
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4
tools/testing/selftests/kvm/x86/apic_bus_clock_test.c
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@ -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);