Re: [Qemu-devel] [PATCH 11/13] tests/vm: netbsd autoinstall, using serial console

[Richard Henderson]

On 5/8/19 11:47 PM, Gerd Hoffmann wrote:
> So, from looking at the patch it seems you need two mappings of the same
> page, one writable and one executable.
> 
> Or, maybe it is also possible with one mapping which is writable first
> when you fill it with code, then gets flipped over to executable when
> you are done with the initialization and want use it.
> 
> Is that correct?

That's certainly the way I read that patch.

> I suspect supporting that in tcg isn't exactly trivial.

It shouldn't be too hard, if required.  All of the writing to the buffer is
isolated to a couple of inline functions.

I do wonder if using paxctl -m as a part of the build process for affected *BSD
isn't just as easy?


r~