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Introduce a new selftest for Hyper-V clocksources (MSR-based reference TSC and TSC page). As a starting point, test the following: 1) Reference TSC is 1Ghz clock. 2) Reference TSC and TSC page give the same reading. 3) TSC page gets updated upon KVM_SET_CLOCK call. 4) TSC page does not get updated when guest opted for reenlightenment. 5) Disabled TSC page doesn't get updated. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20210318140949.1065740-1-vkuznets@redhat.com> [Add a host-side test using TSC + KVM_GET_MSR too. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>