Re: [PATCH -v2 0/4] EFI 1:1 mapping

Ingo Molnar
2013-06-20T09:22:45Z

* Matthew Garrett <mjg59@srcf.ucam.org> wrote:

> On Thu, Jun 20, 2013 at 11:13:21AM +0200, Ingo Molnar wrote:
>
> > Cool - and supposedly this will work in a Mac environment as well? Would
> > be very nice to avoid fundamentally fragile system specific quirks for
> > something as fundamental as the EFI runtime memory mapping model ...
>
> Apple is the only case where I'd expect there to be an issue, since they
> only started supporting booting Windows via UEFI on very recent systems.
> However, unless they're actually sniffing the page tables on UEFI entry,
> I can't see any way that this could break things???

Agreed - I was susprised to see that the runtime was able to _break_ in
any way due to 1:1: my assumption was that it can only get better.

But I did not realize that the 1:1 boot flag also changed what was passed
down, which probably explains the breakages.

I'd even argue to not do this whole boot flag thing at all - just
standardize on the Windows compatibility model as closely as possible.

Thanks,

Ingo