selftests: KVM: Add test for KVM_{GET,SET}_CLOCK
Add a selftest for the new KVM clock UAPI that was introduced. Ensure that the KVM clock is consistent between userspace and the guest, and that the difference in realtime will only ever cause the KVM clock to advance forward. Cc: Andrew Jones <drjones@redhat.com> Signed-off-by: Oliver Upton <oupton@google.com> Message-Id: <20210916181555.973085-3-oupton@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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