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From: James Morse <james.morse@arm.com>
To: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: mark.rutland@arm.com, geoff@infradead.org,
	catalin.marinas@arm.com, will.deacon@arm.com,
	bauerman@linux.vnet.ibm.com, dyoung@redhat.com,
	kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v32 07/13] arm64: hibernate: preserve kdump image around hibernation
Date: Wed, 15 Feb 2017 12:12:35 +0000	[thread overview]
Message-ID: <58A445B3.4080608@arm.com> (raw)
In-Reply-To: <20170207080904.5974-5-takahiro.akashi@linaro.org>

Hi Akashi,

On 07/02/17 08:08, AKASHI Takahiro wrote:
> Since arch_kexec_protect_crashkres() removes a mapping for crash dump
> kernel memory, the loaded contents won't be preserved around hibernation.
> 
> In this patch, arch_kexec_(un)protect_crashkres() are additionally called
> before/after hibernation so that the relevant region will be mapped again
> and restored just as the other memory regions are.

Reviewed-by: James Morse <james.morse@arm.com>

A quick test of this took longer than expected (writing to a slow usb device), I
suspect it is save/restoring the whole crash region (which I don't think is a
problem). If someone turns out to use this combination of features I will look
at improving this, (almost certainly requires core-code changes).


Thanks,

James

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kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

WARNING: multiple messages have this Message-ID (diff)
From: james.morse@arm.com (James Morse)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v32 07/13] arm64: hibernate: preserve kdump image around hibernation
Date: Wed, 15 Feb 2017 12:12:35 +0000	[thread overview]
Message-ID: <58A445B3.4080608@arm.com> (raw)
In-Reply-To: <20170207080904.5974-5-takahiro.akashi@linaro.org>

Hi Akashi,

On 07/02/17 08:08, AKASHI Takahiro wrote:
> Since arch_kexec_protect_crashkres() removes a mapping for crash dump
> kernel memory, the loaded contents won't be preserved around hibernation.
> 
> In this patch, arch_kexec_(un)protect_crashkres() are additionally called
> before/after hibernation so that the relevant region will be mapped again
> and restored just as the other memory regions are.

Reviewed-by: James Morse <james.morse@arm.com>

A quick test of this took longer than expected (writing to a slow usb device), I
suspect it is save/restoring the whole crash region (which I don't think is a
problem). If someone turns out to use this combination of features I will look
at improving this, (almost certainly requires core-code changes).


Thanks,

James

  reply	other threads:[~2017-02-15 12:12 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-07  8:06 [PATCH v32 00/13] arm64: add kdump support AKASHI Takahiro
2017-02-07  8:06 ` AKASHI Takahiro
2017-02-07  8:08 ` [PATCH v32 01/13] memblock: add memblock_clear_nomap() AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-07  8:08 ` [PATCH v32 02/13] memblock: add memblock_cap_memory_range() AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-07  8:08 ` [PATCH v32 03/13] arm64: limit memory regions based on DT property, usable-memory-range AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-07  8:08 ` [PATCH v32 04/13] arm64: kdump: reserve memory for crash dump kernel AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-07  8:08 ` [PATCH v32 05/13] arm64: mm: allow for unmapping part of kernel mapping AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-07  8:08 ` [PATCH v32 06/13] arm64: kdump: protect crash dump kernel memory AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-17 16:08   ` James Morse
2017-02-17 16:08     ` James Morse
2017-02-07  8:08 ` [PATCH v32 07/13] arm64: hibernate: preserve kdump image around hibernation AKASHI Takahiro
2017-02-07  8:08   ` AKASHI Takahiro
2017-02-15 12:12   ` James Morse [this message]
2017-02-15 12:12     ` James Morse
2017-02-16  9:52     ` AKASHI Takahiro
2017-02-16  9:52       ` AKASHI Takahiro
2017-02-07  8:09 ` [PATCH v32 08/13] arm64: kdump: implement machine_crash_shutdown() AKASHI Takahiro
2017-02-07  8:09   ` AKASHI Takahiro
2017-02-07  8:09 ` [PATCH v32 09/13] arm64: kdump: add VMCOREINFO's for user-space tools AKASHI Takahiro
2017-02-07  8:09   ` AKASHI Takahiro
2017-02-07  8:09 ` [PATCH v32 10/13] arm64: kdump: provide /proc/vmcore file AKASHI Takahiro
2017-02-07  8:09   ` AKASHI Takahiro
2017-02-07  8:09 ` [PATCH v32 11/13] arm64: kdump: enable kdump in defconfig AKASHI Takahiro
2017-02-07  8:09   ` AKASHI Takahiro
2017-02-07  8:09 ` [PATCH v32 12/13] Documentation: kdump: describe arm64 port AKASHI Takahiro
2017-02-07  8:09   ` AKASHI Takahiro
2017-02-07  8:10 ` [PATCH v32 13/13] Documentation: dt: chosen properties for arm64 kdump AKASHI Takahiro
2017-02-07  8:10   ` AKASHI Takahiro
2017-02-07  8:10   ` AKASHI Takahiro
2017-02-08  5:39 ` [PATCH v32 00/13] arm64: add kdump support Pratyush Anand
2017-02-08  5:39   ` Pratyush Anand
2017-03-02  0:51 ` Goel, Sameer
2017-03-02  0:51   ` Goel, Sameer
2017-03-02 10:34   ` AKASHI Takahiro
2017-03-02 10:34     ` AKASHI Takahiro

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