linux-kernel - Re: [regression, bisected] x86: efi: Pass boot services variable info to runtime code

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Date:	Fri, 24 May 2013 20:11:01 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	Russ Anderson <rja@....com>
CC:	Matt Fleming <matt@...sole-pimps.org>,
	"matt.fleming@...el.com" <matt.fleming@...el.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [regression, bisected] x86: efi: Pass boot services variable
 info to runtime code

On Fri, 2013-05-24 at 15:05 -0500, Russ Anderson wrote:

> One other data point is if the query_variable_info call is hacked to
> remove one of the EFI flags (ie comment out EFI_VARIABLE_BOOTSERVICE_ACCESS)
> the efi_call_phys4() call fails with EFI_INVALID_PARAMETER and
> the system boots.  Of course it does not create /sys/firmware/efivars
> entries and complains "[Firmware Bug]: efi: Inconsistent initial sizes".
> But at least it boots.

EFI_VARIABLE_RUNTIME_ACCESS is only legal if
EFI_VARIABLE_BOOTSERVICE_ACCESS is set, so it's correct to throw
EFI_INVALID_PARAMETER there.

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