From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Haren Myneni <hbabu@us.ibm.com>,
Simon Horman <horms@verge.net.au>,
Yinghai Lu <yinghai@kernel.org>,
kexec@lists.infradead.org, Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH 3/8] add mem64_min/max control
Date: Sat, 17 Nov 2012 21:14:40 -0800 [thread overview]
Message-ID: <50A86EC0.2030304@zytor.com> (raw)
In-Reply-To: <87haonqzdz.fsf@xmission.com>
On 11/17/2012 09:00 PM, Eric W. Biederman wrote:
>>
>> The easy way to fix that is to do what we do on 32 bits: we copy it
>> into the bss before we turn paging on (the 64-bit equivalent is before
>> we switch to the new page tables.) That way we know where it is, at
>> least for the bounded-size data items.
>
> Whatever works. It sounds like six of one half a dozen of the other to
> me. Last I looked early_ioremap works as soon as paging is enabled on
> x86_64.
>
Well, x86-64 means paging is enabled. Presumably you mean "as son as we
are onl our own page tables". I'm fine either way, *as long as* we
don't touch *any* memory outside text/data/bss/brk before we recover
this content.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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next prev parent reply other threads:[~2012-11-18 5:14 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-16 23:04 [PATCH 0/8] kexec: put bzImage and ramdisk above 4G for x86 64bit Yinghai Lu
2012-11-16 23:04 ` [PATCH 1/8] Add min/max macro Yinghai Lu
2012-11-16 23:04 ` [PATCH 2/8] x86: add boot header member for version 2.12 Yinghai Lu
2012-11-16 23:04 ` [PATCH 3/8] add mem64_min/max control Yinghai Lu
2012-11-17 6:18 ` Eric W. Biederman
2012-11-17 7:06 ` Yinghai Lu
2012-11-17 8:25 ` Eric W. Biederman
2012-11-17 20:04 ` Yinghai Lu
2012-11-17 20:41 ` H. Peter Anvin
2012-11-17 20:51 ` Yinghai Lu
2012-11-17 20:54 ` H. Peter Anvin
2012-11-18 0:44 ` Yinghai Lu
2012-11-18 4:34 ` H. Peter Anvin
2012-11-18 4:47 ` Eric W. Biederman
2012-11-18 4:55 ` H. Peter Anvin
2012-11-18 5:00 ` Eric W. Biederman
2012-11-18 5:14 ` H. Peter Anvin [this message]
2012-11-18 4:56 ` Yinghai Lu
2012-11-18 5:20 ` Eric W. Biederman
2012-11-18 5:35 ` Yinghai Lu
2012-11-18 5:39 ` Yinghai Lu
2012-11-18 5:58 ` Yinghai Lu
2012-11-18 6:11 ` Eric W. Biederman
2012-11-18 6:32 ` Yinghai Lu
2012-11-18 6:38 ` Yinghai Lu
2012-11-18 6:50 ` Eric W. Biederman
2012-11-18 6:53 ` Yinghai Lu
2012-11-18 7:18 ` Yinghai Lu
2012-11-18 10:38 ` Eric W. Biederman
2012-11-19 3:02 ` [PATCH 0/6] kexec: put bzImage and ramdisk above 4G for x86 64bit Yinghai Lu
2012-11-19 3:02 ` [PATCH 1/6] kexec, x86: add boot header member for version 2.12 Yinghai Lu
2012-11-19 3:02 ` [PATCH 2/6] kexec: don't die during buffer finding Yinghai Lu
2012-11-19 3:02 ` [PATCH 3/6] kexec, x86: put ramdisk high for 64bit bzImage Yinghai Lu
2012-11-19 3:02 ` [PATCH 4/6] kexec, x86: set ext_cmd_line_ptr when boot_param is put high Yinghai Lu
2012-11-19 3:02 ` [PATCH 5/6] kexec, x86: Make x64_64 purgatory relocatable above 4G Yinghai Lu
2012-11-19 3:02 ` [PATCH 6/6] kexec, x86_64: put 64bit bzImage high Yinghai Lu
2012-11-19 3:04 ` [PATCH v2 0/6] kexec: put bzImage and ramdisk above 4G for x86 64bit Yinghai Lu
2012-11-19 3:04 ` [PATCH v2 1/6] kexec, x86: add boot header member for version 2.12 Yinghai Lu
2012-11-19 3:04 ` [PATCH v2 2/6] kexec: don't die during buffer finding Yinghai Lu
2012-11-19 17:05 ` Eric W. Biederman
2012-11-19 3:04 ` [PATCH v2 3/6] kexec, x86: put ramdisk high for 64bit bzImage Yinghai Lu
2012-11-19 17:20 ` Eric W. Biederman
2012-11-19 3:04 ` [PATCH v2 4/6] kexec, x86: set ext_cmd_line_ptr when boot_param is put high Yinghai Lu
2012-11-19 17:22 ` Eric W. Biederman
2012-11-19 3:04 ` [PATCH v2 5/6] kexec, x86: Make x64_64 purgatory relocatable above 4G Yinghai Lu
2012-11-19 3:04 ` [PATCH v2 6/6] kexec, x86_64: put 64bit bzImage high Yinghai Lu
2012-11-19 17:28 ` Eric W. Biederman
2012-11-19 17:04 ` [PATCH v2 0/6] kexec: put bzImage and ramdisk above 4G for x86 64bit Eric W. Biederman
2012-11-18 6:24 ` [PATCH 3/8] add mem64_min/max control H. Peter Anvin
2012-11-18 6:23 ` H. Peter Anvin
2012-11-18 6:44 ` Eric W. Biederman
2012-11-16 23:04 ` [PATCH 4/8] Move out mem_min/max checking in locate_hole Yinghai Lu
2012-11-16 23:04 ` [PATCH 5/8] seperate checking 64bit mem range Yinghai Lu
2012-11-16 23:04 ` [PATCH 6/8] debug print out for add_buf Yinghai Lu
2012-11-16 23:04 ` [PATCH 7/8] x86: put ramdisk high for 64bit bzImage Yinghai Lu
2012-11-16 23:04 ` [PATCH 8/8] x86: put 64bit bzImage high Yinghai Lu
2012-11-17 6:33 ` Eric W. Biederman
[not found] ` <CAE9FiQWJaT9yfdV0rgV-5rM=BR4eX8sr+a99g8Ggf-+YkD8qgQ@mail.gmail.com>
2012-11-17 8:43 ` Eric W. Biederman
2012-11-19 21:00 ` [PATCH 0/8] kexec: put bzImage and ramdisk above 4G for x86 64bit Vivek Goyal
2012-11-19 22:34 ` Yinghai Lu
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