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This function is needed for KVM's nested virtualization. The nested TSC scaling implementation requires multiplying the signed TSC offset with the unsigned TSC multiplier. Signed-off-by: Ilias Stamatis <ilstam@amazon.com> Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Message-Id: <20210526184418.28881-2-ilstam@amazon.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>