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

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Message-ID: <20130603143010.GA20252@srcf.ucam.org>
Date:	Mon, 3 Jun 2013 15:30:10 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	Linux EFI <linux-efi@...r.kernel.org>,
	Matt Fleming <matt@...sole-pimps.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 0/4] EFI 1:1 mapping

On Mon, Jun 03, 2013 at 07:27:22AM -0700, James Bottomley wrote:

> That's correct.  I think not calling SetVirtualAddressMap() and just
> using a 1:1 mapping is far safer (having looked at what tianocore does
> for SetVirtualAddressMap()).  The chances are that all the UEFI bioses
> are only tested with windows, so the pointer chases it has to do to
> switch address maps only work with the operations windows does.

Windows calls SetVirtualAddressMap(), so the only way these systems have 
been tested is with SetVirtualAddressMap().

-- 
Matthew Garrett | mjg59@...f.ucam.org
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