Re: UVM and the NULL page

[Eduardo Horvath <eeh%NetBSD.org@localhost>]

On Mon, 1 Aug 2016, Joerg Sonnenberger wrote:

> I disagree. While it is nice to assert this property in the pmap, it is
> the wrong place. First of all, all pmaps need to be audited, at least on
> platforms with shared address space. It's not specific to x86. Second,
> part of the problem is that UVM does not handle its own constraints
> correctly. That means it is possible that some of the (then failing)
> requests could be fulfilled by correct code. In short, handling it in
> the pmap doesn't actually solve the problem completely either.

I don't understand.  If you can't enter the mapping into the TLB, who 
cares what UVM does?

Eduardo