[PATCH v5] arm64: fix VTTBR_BADDR_MASK

[Joel Schopp]

> hmmm, the point is that we need to ensure that we have a properly
> aligned allocated PGD, that's what this patch currently addresses, and as
> you pointed out, the BUG_ON() just before trying to run a VM is not the
> nicest solution - we should really be dealing with this properly at
> allocation time.
>
> But, if you don't have time to look at that, then ok, I'll have to pick
> it up myself.
>
> However, you are hinting that we do not support 4 levels of page tables,
> yet you do allow the t0sz_to_vttbr_x funciton to pass even when using
> t0sz values only supported under 4 levels of page tables....  What is
> the rationale for that?
Minimizing merge conflicts. I figure both are going in within the next
month or two.