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KVM's 'gtod_is_based_on_tsc()' recognizes two clocksources: 'tsc' and 'hyperv_clocksource_tsc_page' and enables kvmclock in 'masterclock' mode when either is in use. Transform 'sys_clocksource_is_tsc()' into 'sys_clocksource_is_based_on_tsc()' to support the later. This affects two tests: kvm_clock_test and vmx_nested_tsc_scaling_test, both seem to work well when system clocksource is 'hyperv_clocksource_tsc_page'. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Link: https://lore.kernel.org/r/20240109141121.1619463-4-vkuznets@redhat.com Signed-off-by: Sean Christopherson <seanjc@google.com>