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

Ingo Molnar
2013-06-19T13:04:39Z

* Borislav Petkov <bp@alien8.de> wrote:

> On Wed, Jun 19, 2013 at 02:52:43PM +0200, Ingo Molnar wrote:
> > I hope making it a weird boot option is not the end plan, there's
> > little point in _not_ enabling 1:1 mappings by default eventually:
> > the 1:1 mapping is supposed to emulate a "Windows compatible" EFI
> > environment better and is expected to work around certain EFI runtime
> > crashes.
>
> And yet there are the Macs which reportedly cannot stomach this.

Do we know why?

> And then there's the issue where some boxes cannot boot through the EFI
> stub with those patches even without "efi=1:1_map" on the command line.
> The issue has something to do with the "cmpb $0, efi_use_11_map" in the
> efi_callX stubs.

A bug I suspect?

> And then again, other boxes have no problem with it and boot perfectly
> fine.
>
> So I don't know - it all looks like a weird boot, opt-in option for now.

But once it works reliably we can enable it, right?

Thanks,

Ingo