linux-kernel - Re: [PATCH v7 00/27] x86, boot, 64bit: Add support for loading ramdisk and bzImage above 4G

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 21 Dec 2012 19:01:21 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 00/27] x86, boot, 64bit: Add support for loading ramdisk and bzImage above 4G

Earlyprintk please?

Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:

>On Mon, Dec 17, 2012 at 11:15:32PM -0800, Yinghai Lu wrote:
>> Now we have limit kdump reseved under 896M, because kexec has the
>limitation.
>> and also bzImage need to stay under 4g.
>> 
>> To make kexec/kdump could use range above 4g, we need to make bzImage
>and
>> ramdisk could be loaded above 4g.
>> During booting bzImage will be unpacked on same postion and stay
>high.
>> 
>> The patches add fields in setup_header and boot_params to
>> 1. get info about ramdisk position info above 4g from
>bootloader/kexec
>> 2. get info about cmd_line_ptr info above 4g from bootloader/kexec
>> 3. set xloadflags bit0 in header for bzImage and bootloader/kexec
>load
>>    could check that to decide if it could to put bzImage high.
>> 4. use sentinel to make sure ext_* fields in boot_params could be
>used.
>> 
>> This patches is tested with kexec tools with local changes and they
>are sent
>> to kexec list later.
>> 
>> could be found at:
>> 
>>        
>git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
>for-x86-boot
>
>Did a light test and it looks to work under Xen - thought I had not
>tested
>any various configuration of memory layouts. 
>
>More worryingly it blew up under native under an Dell T105 AMD box with
>4GB of memory.
>I can't get it even to print anything on the serial log:
>
>(this is an excerpt from pxelinux.cfg/C0A8 file)
>LABEL BAREMETAL
>   KERNEL vmlinuz
>APPEND initrd=initramfs.cpio.gz debug selinux=0  loglevel=10 apic=debug
>console=uart8250,115200n8
>
>
>PXELINUX 3.82 2009-06-09  Copyright (C) 1994-2009 H. Peter Anvin et al
>Loading
>vmlinuz.......................................................................
>Loading
>initramfs.cpio.gz...........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................!
 .........
................................................................................................................................................................................................................................................................................ready.

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/