linux-kernel - Re: [PATCH] Remove warning in efi_enter_virtual

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Message-ID: <517084DA.4090401@zytor.com>
Date:	Thu, 18 Apr 2013 16:42:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Bryan O'Donoghue" <bryan.odonoghue.lkml@...us-software.ie>
CC:	Matt Fleming <matt@...sole-pimps.org>, matthew.garrett@...ula.com,
	linux-efi@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, Darren Hart <darren.hart@...el.com>,
	Josh Triplett <josh@...htriplett.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Josh Boyer <jwboyer@...hat.com>
Subject: Re: [PATCH] Remove warning in efi_enter_virtual_mode

> 
> "UEI" is Celtic for "We missed DOS so we burned it into your ROMS"
> 
> I love it "maith an fear"
> 
>> There are currently only two situations where we need to map EFI Boot
>> Service regions,
>>
>>    1. To workaround the firmware bug described in 916f676f8
>>    2. To access the ACPI BGRT image
>>
>> but since we haven't seen an i386 implementation that requires either,
>> this simple fix should suffice for now. Item 2. above does still work on
>> i386 provided that the BGRT image is not in highmem.
> 
> Matt, Peter, Josh, Darren.
> 
> Given it's not possible to guarantee someone won't stuff a BGRT into
> EFI_BOOT_MEMORY >= highmem eventually (and indeed the axioms of the
> universe pretty much guarantee eventually it will be so) - I'd suggest
> version 2.
> 

Quite frankly, it is quite likely.

> A kernel parameter - rather than a probe for BGRT - since we anticipate
> BIOS bugs on the way.

Pardon?  Kernel parameter for what?

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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