Let $(M,J)$ be a complex manifold. We say that $\omega\in H^2(X;\mathbb{R})$ is Kahler if and only if $\omega$ is closed, positive [i.e. $\omega(v,Jv)>0, \forall v\neq0$], and a $(1,1)$-form [i.e. $\omega(Jv,Jw)=\omega(v,w), \forall v,w$ ].

We denote by $K_M$ the set of all Kahler classes on $M$.

Now consider $(N,J')$ some complex manifold and its corresponding Kahler cone $K_N$.

What is known about $K_{M\times N}$ versus $K_M$ and $K_N$?

Feel free to add additional assumptions on $M$ and $N$. I am only curious to find out what the known theorems are.

For instance: there is a natural map from $K_{M}\times K_N$ to $K_{M\times N}$, sending $(\omega,\eta)$ to $$\omega\times 1+1\times\eta.$$

What can be said about this map? Does the cone generated by its image equal $K_{M\times N}$?