linux-kernel - Re: [PATCH 1/4] Documentation: arm: [U]EFI runtime services

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Message-ID: <20130627143801.GB12900@srcf.ucam.org>
Date:	Thu, 27 Jun 2013 15:38:01 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Leif Lindholm <leif.lindholm@...aro.org>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-efi@...r.kernel.org,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>, matt.fleming@...el.com
Subject: Re: [PATCH 1/4] Documentation: arm: [U]EFI runtime services

On Thu, Jun 27, 2013 at 11:00:50AM +0200, Leif Lindholm wrote:
> On Thu, Jun 27, 2013 at 02:32:19AM +0100, Matthew Garrett wrote:
> > We can probably get away with that now, but it does risk us ending up 
> > with some firmware that expects to run in physical mode (boards designed 
> > for Linux) and some firmware that expects to run in virtual mode (boards 
> > designed for Windows). The degree of lockdown in the Windows ecosystem 
> > at present means it's not a real problem at the moment, but if that ever 
> > changes we're going to risk incompatibility.
> 
> Is there anything preventing calling SetVirtualAddressMap() with a
> 1:1 map?

No, but we've seen bugs as a result on some x86 systems. As far as the 
spec, though, you're fine.

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