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Date: Thu, 6 Jun 2013 21:36:13 +0200
From: Borislav Petkov <bp@...en8.de>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Matt Fleming <matt@...sole-pimps.org>,
Linux EFI <linux-efi@...r.kernel.org>,
Matthew Garrett <mjg59@...f.ucam.org>,
Jiri Kosina <jkosina@...e.cz>, X86-ML <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH 4/4] x86, efi: Map runtime services 1:1
On Thu, Jun 06, 2013 at 12:28:20PM -0700, H. Peter Anvin wrote:
> Or we could materialize mappings for this specific PGD. However,
> adding a read of %cr3 in __do_page_fault sounds expensive.
Yes, I think we want to make sure all mappings are there when we do an
EFI runtime call so that we never #PF while it executes.
Matt mentioned on IRC that the it could be that his EFI runtime is
referencing EFI_RESERVED area which we don't map. However, we need to
confirm/disprove that first, as it is currently only a hunch.
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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