From mboxrd@z Thu Jan  1 00:00:00 1970
From: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
Subject: Re: [PATCH -v2 0/4] EFI 1:1 mapping
Date: Wed, 19 Jun 2013 19:37:21 +0200
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To: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Cc: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Linux EFI <linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Matt Fleming <matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>, Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>, X86 ML <x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Borislav Petkov <bp-l3A5Bk7waGM@public.gmane.org>
List-Id: linux-efi@vger.kernel.org

On Wed, Jun 19, 2013 at 12:25:42PM -0500, H. Peter Anvin wrote:
> On 06/19/2013 08:02 AM, Borislav Petkov wrote:
> > 
> > And yet there are the Macs which reportedly cannot stomach this.
> > 
> No, the reports are that if you use the 1:1 map as the primary address
> on Macs the drivers fail... not that you can't have a 1:1 map.

That's what I meant: ... cannot stomach when the 1:1 map is shoved down
SetVirtualAddressMap.

The thing is, if we want to have both the 1:1 map and the high map
during an EFI runtime call, we would need to *always* switch the
pagetable for an EFI runtime call and establish both mappings in
->trampoline_pgd beforehand.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--