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

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Message-ID: <20130619175005.GJ28300@pd.tnic>
Date:	Wed, 19 Jun 2013 19:50:05 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linux EFI <linux-efi@...r.kernel.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <mjg59@...f.ucam.org>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH -v2 0/4] EFI 1:1 mapping

On Wed, Jun 19, 2013 at 12:38:24PM -0500, H. Peter Anvin wrote:
> I thought that was the plan?

Well, currently if I'm booted with "efi=1:1_map" I'm creating only the
1:1 mapping in ->trampoline_pgd and switching the pagetable only then.
Otherwise, I'm using the high, ioremapped mappings - i.e., what we have
now.

I guess I can sync the kernel address space into ->trampoline_pgd after
having created the 1:1 mappings and always switch the pagetable later,
after we've done SetVirtualAddressMap.

Which should take care of the EFI boot stub issue too, as I can define
another set of efi_callX which switch the pagetable unconditionally.

Let me see how that pans out...

-- 
Regards/Gruss,
    Boris.

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