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

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Message-ID: <51C1EC90.9030802@zytor.com>
Date:	Wed, 19 Jun 2013 12:38:24 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>
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 06/19/2013 12:37 PM, Borislav Petkov wrote:
> 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.
> 

I thought that was the plan?

	-hpa

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