linux-kernel - Re: [PATCH] x86/efi: Always map boot service regions into new EFI page tables

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Message-ID: <1457888975.3884.9.camel@talk21.com>
Date:	Sun, 13 Mar 2016 17:09:35 +0000
From:	Scott Ashcroft <scott.ashcroft@...k21.com>
To:	Matt Fleming <matt@...eblueprint.co.uk>,
	Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Borislav Petkov <bp@...en8.de>,
	Ben Hutchings <ben@...adent.org.uk>,
	Raphael Hertzog <hertzog@...ian.org>,
	Roger Shimizu <rogershimizu@...il.com>,
	Alexis Murzeau <amurzeau@...il.com>
Subject: Re: [PATCH] x86/efi: Always map boot service regions into new EFI
 page tables

On Fri, 2016-03-11 at 11:19 +0000, Matt Fleming wrote:
> Some machines have EFI regions in page zero (physical address
> 0x00000000) and historically that region has been added to the e820
> map via trim_bios_range(), and ultimately mapped into the kernel page
> tables. It was not mapped via efi_map_regions() as one would expect.
> 
> Alexis reports that with the new separate EFI page tables some boot
> services regions, such as page zero, are not mapped. This triggers an
> oops during the SetVirtualAddressMap() runtime call.


I'm still seeing a failure to boot even with this patch.

http://www.qzxyz.com/IMG_20160313_164601.jpgSorry for the dodgy photo but the screen has almost a mirror finish.

Attached is the dmesg from 4.4 with efi=debug memblock=debug

Cheers,
Scott
View attachment "dmesg.txt" of type "text/plain" (77068 bytes)