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From: Chen Yu <yu.c.chen@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	"Rafael J. Wysocki" <rafael@kernel.org>
Cc: Pavel Machek <pavel@ucw.cz>, Len Brown <len.brown@intel.com>,
	Zhimin Gu <kookoo.gu@intel.com>, Chen Yu <yu.c.chen@intel.com>,
	x86@kernel.org, linux-pm@vger.kernel.org,
	linux-kernel@vger.kernel.org, stable@kernel.org
Subject: [PATCH 01/12][v4] x86, hibernate: Fix nosave_regions setup for hibernation
Date: Fri, 21 Sep 2018 14:26:24 +0800	[thread overview]
Message-ID: <9b373ca69c3a1b872874487ad235161314f1172c.1537448058.git.yu.c.chen@intel.com> (raw)
In-Reply-To: <cover.1537448058.git.yu.c.chen@intel.com>

From: Zhimin Gu <kookoo.gu@intel.com>

On 32bit systems, nosave_regions(non RAM areas) located between
max_low_pfn and max_pfn are not excluded from hibernation snapshot
currently, which may result in a machine check exception when
trying to access these unsafe regions during hibernation:

[  612.800453] Disabling lock debugging due to kernel taint
[  612.805786] mce: [Hardware Error]: CPU 0: Machine Check Exception: 5 Bank 6: fe00000000801136
[  612.814344] mce: [Hardware Error]: RIP !INEXACT! 60:<00000000d90be566> {swsusp_save+0x436/0x560}
[  612.823167] mce: [Hardware Error]: TSC 1f5939fe276 ADDR dd000000 MISC 30e0000086
[  612.830677] mce: [Hardware Error]: PROCESSOR 0:306c3 TIME 1529487426 SOCKET 0 APIC 0 microcode 24
[  612.839581] mce: [Hardware Error]: Run the above through 'mcelog --ascii'
[  612.846394] mce: [Hardware Error]: Machine check: Processor context corrupt
[  612.853380] Kernel panic - not syncing: Fatal machine check
[  612.858978] Kernel Offset: 0x18000000 from 0xc1000000 (relocation range: 0xc0000000-0xf7ffdfff)

This is because on 32bit systems, pages above max_low_pfn are regarded
as high memeory, and accessing unsafe pages might cause expected MCE.
On the problematic 32bit system, there are reserved memory above low
memory, which triggered the MCE:

e820 memory mapping:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009d7ff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009d800-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000d160cfff] usable
[    0.000000] BIOS-e820: [mem 0x00000000d160d000-0x00000000d1613fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000d1614000-0x00000000d1a44fff] usable
[    0.000000] BIOS-e820: [mem 0x00000000d1a45000-0x00000000d1ecffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000d1ed0000-0x00000000d7eeafff] usable
[    0.000000] BIOS-e820: [mem 0x00000000d7eeb000-0x00000000d7ffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000d8000000-0x00000000d875ffff] usable
[    0.000000] BIOS-e820: [mem 0x00000000d8760000-0x00000000d87fffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000d8800000-0x00000000d8fadfff] usable
[    0.000000] BIOS-e820: [mem 0x00000000d8fae000-0x00000000d8ffffff] ACPI data
[    0.000000] BIOS-e820: [mem 0x00000000d9000000-0x00000000da71bfff] usable
[    0.000000] BIOS-e820: [mem 0x00000000da71c000-0x00000000da7fffff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000da800000-0x00000000dbb8bfff] usable
[    0.000000] BIOS-e820: [mem 0x00000000dbb8c000-0x00000000dbffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000dd000000-0x00000000df1fffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed00000-0x00000000fed03fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000041edfffff] usable

Fix this problem by changing pfn limit from max_low_pfn to max_pfn.
This fix does not impact 64bit system because on 64bit max_low_pfn
is the same as max_pfn.

Signed-off-by: Zhimin Gu <kookoo.gu@intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@kernel.org
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
---
 arch/x86/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b4866badb235..90ecc108bc8a 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1251,7 +1251,7 @@ void __init setup_arch(char **cmdline_p)
 	x86_init.hyper.guest_late_init();
 
 	e820__reserve_resources();
-	e820__register_nosave_regions(max_low_pfn);
+	e820__register_nosave_regions(max_pfn);
 
 	x86_init.resources.reserve_resources();
 
-- 
2.17.1


  reply	other threads:[~2018-09-21  6:19 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-21  6:24 [PATCH 00/12][v4] Backport several fixes from 64bits to 32bits hibernation Chen Yu
2018-09-21  6:26 ` Chen Yu [this message]
2018-09-21  6:26 ` [PATCH 02/12][v4] PM / hibernate: Check the success of generating md5 digest before hibernation Chen Yu
2018-09-21  6:26 ` [PATCH 03/12][v4] x86-32/asm/power: Create stack frames in hibernate_asm_32.S Chen Yu
2018-09-21  6:26 ` [PATCH 04/12][v4] x86, hibernate: Extract the common code of 64/32 bit system Chen Yu
2018-09-21  6:27 ` [PATCH 05/12][v4] x86-32, hibernate: Enable CONFIG_ARCH_HIBERNATION_HEADER on 32bit system Chen Yu
2018-09-21  6:27 ` [PATCH 06/12][v4] x86, hibernate: Rename temp_level4_pgt to temp_pgt Chen Yu
2018-09-21  6:27 ` [PATCH 07/12][v4] x86-32, hibernate: Use temp_pgt as the temporary page table Chen Yu
2018-09-21 11:21   ` Pavel Machek
2018-09-21  6:28 ` [PATCH 08/12][v4] x86-32, hibernate: Use the page size macro instead of constant value Chen Yu
2018-09-21  6:28 ` [PATCH 09/12][v4] x86-32, hibernate: Switch to original page table after resumed Chen Yu
2018-09-21  6:28 ` [PATCH 10/12][v4] x86-32, hibernate: Switch to relocated restore code during resume on 32bit system Chen Yu
2018-09-21  6:28 ` [PATCH 11/12][v4] x86-32, hibernate: Set up temporary text mapping for " Chen Yu
2018-09-21  6:28 ` [PATCH 12/12][v4] x86-32, hibernate: Adjust in_suspend after resumed on " Chen Yu
2018-10-02  9:20 ` [PATCH 00/12][v4] Backport several fixes from 64bits to 32bits hibernation Thomas Gleixner
2018-10-05  9:49   ` Rafael J. Wysocki

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