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From: "H. Peter Anvin" <hpa@zytor.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
	Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org, Rob Landley <rob@landley.net>,
	Matt Fleming <matt.fleming@intel.com>
Subject: Re: [PATCH v3 11/12] x86, boot: add fields to support load bzImage and ramdisk high
Date: Sat, 24 Nov 2012 14:32:27 -0800	[thread overview]
Message-ID: <50B14AFB.3040500@zytor.com> (raw)
In-Reply-To: <CAE9FiQWoCyuGNqHSAZU_NXwjci3BJZQmmAUnWPn_pKCzEt8h7g@mail.gmail.com>

On 11/24/2012 02:18 PM, Yinghai Lu wrote:
>>
>> Careful... consider the people who use a kexec-based solution as
>> bootloaders.
>
> yes, those may not update kexec in the flash...
>
> then, may need to use another bit in xloadflags to tell new kernel if
> need to check ext_...
>
> Field name:     xloadflags
> Type:           modify (obligatory)
> Offset/size:    0x236/2
> Protocol:       2.12+
>
>    This field is a bitmask.
>
>    Bit 0 (read): CAN_BE_LOADED_ABOVE_4G
>          - If 1, kernel/boot_params/cmdline/ramdisk can be above 4g,
>                  set by kernel.
>
>    Bit 1 (write): LOADED_ABOVE_4G
>          - If 1, kernel/boot_params/cmdline/ramdisk is loaded above 4g,
>                  set by bootloader, and kernel will check ext_ramdisk_image,
>                  ext_ramdisk_size and ext_cmd_line_ptr.
>

Well, that solves the problem for *this specific instance* but I fear 
therein lies madness in the general case.

	-hpa

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


  reply	other threads:[~2012-11-24 22:33 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-21  7:15 [PATCH v3 00/12] x86, boot, 64bit: Add support for loading ramdisk and bzImage high Yinghai Lu
2012-11-21  7:15 ` [PATCH v3 01/12] x86, boot: move verify_cpu.S after 0x200 Yinghai Lu
2012-11-21 17:23   ` H. Peter Anvin
2012-11-21 19:45     ` Yinghai Lu
2012-11-21 19:50       ` H. Peter Anvin
2012-11-21 20:15         ` Yinghai Lu
2012-11-22  5:48           ` Eric W. Biederman
     [not found]             ` <3178cb29-0e9e-44d2-b21f-45c53f38980a@email.android.com>
2012-11-22 11:27               ` Eric W. Biederman
2012-11-24  7:00                 ` Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 02/12] x86, boot: Move lldt/ltr out of 64bit code section Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 03/12] x86, 64bit: set extra ident page table for whole kernel range Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 04/12] x86, 64bit: add support for loading kernel above 512G Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 05/12] x86: Merge early_reserve_initrd for 32bit and 64bit Yinghai Lu
2012-11-21  7:40   ` Pekka Enberg
2012-11-21  7:16 ` [PATCH v3 06/12] x86: add get_ramdisk_image/size Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 07/12] x86, boot: add get_cmd_line_ptr() Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 08/12] x86, boot: Don't check if cmd_line_ptr is accessible in misc/decompressor() Yinghai Lu
2012-11-21 17:21   ` H. Peter Anvin
2012-11-21 19:18     ` Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 09/12] x86, boot: update cmd_line_ptr to unsigned long Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 10/12] x86: use io_remap to access real_mode_data Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 11/12] x86, boot: add fields to support load bzImage and ramdisk high Yinghai Lu
2012-11-21 17:17   ` H. Peter Anvin
2012-11-21 18:59     ` Yinghai Lu
2012-11-21 19:18       ` H. Peter Anvin
2012-11-22  5:56         ` Yinghai Lu
     [not found]           ` <a1ca794a-09d4-4d36-8c8c-67100cb3696e@email.android.com>
2012-11-22  6:47             ` Yinghai Lu
2012-11-22  6:58               ` Yinghai Lu
2012-11-22 15:59                 ` H. Peter Anvin
2012-11-22 18:28                   ` Yinghai Lu
2012-11-22 18:37                     ` H. Peter Anvin
2012-11-22 18:50                       ` Yinghai Lu
2012-11-22 18:51                         ` H. Peter Anvin
2012-11-22 20:18                           ` Yinghai Lu
2012-11-22 20:20                             ` H. Peter Anvin
2012-11-22 20:29                               ` Yinghai Lu
2012-11-22 20:50                             ` H. Peter Anvin
2012-11-22 21:02                               ` H. Peter Anvin
2012-11-22 22:13                                 ` Yinghai Lu
2012-11-24 12:37                       ` Eric W. Biederman
2012-11-24 17:32                         ` H. Peter Anvin
     [not found]                           ` <CAE9FiQV0Q0fi7TrNjihdsUt0ueT4LLON4o+JEmX6ry9S6AU-ug@mail.gmail.com>
2012-11-24 18:24                             ` H. Peter Anvin
2012-11-24 19:50                           ` H. Peter Anvin
2012-11-24 21:30                             ` Yinghai Lu
2012-11-24 21:38                               ` H. Peter Anvin
2012-11-24 22:18                                 ` Yinghai Lu
2012-11-24 22:32                                   ` H. Peter Anvin [this message]
2012-11-24 23:24                                     ` Yinghai Lu
2012-11-24 23:50                             ` Eric W. Biederman
2012-11-25  0:04                               ` H. Peter Anvin
2012-11-25  0:11                                 ` Yinghai Lu
2012-11-25  5:50                                   ` Yinghai Lu
2012-11-25  5:52                                     ` H. Peter Anvin
2012-11-25  6:09                                       ` Yinghai Lu
2012-11-25  0:04                               ` Yinghai Lu
2012-11-25  0:06                                 ` H. Peter Anvin
2012-11-21  7:16 ` [PATCH v3 12/12] x86: remove 1024g limitation for kexec buffer on 64bit Yinghai Lu

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