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arm64: hibernate: preserve kdump image around hibernation

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Since arch_kexec_protect_crashkres() removes a mapping for crash dump
kernel image, the loaded data won't be preserved around hibernation.

In this patch, helper functions, crash_prepare_suspend()/
crash_post_resume(), are additionally called before/after hibernation so
that the relevant memory segments will be mapped again and preserved just
as the others are.

In addition, to minimize the size of hibernation image, crash_is_nosave()
is added to pfn_is_nosave() in order to recognize only the pages that hold
loaded crash dump kernel image as saveable. Hibernation excludes any pages
that are marked as Reserved and yet "nosave."

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
AKASHI Takahiro
2017-04-03 11:24:35 +09:00
committed by Catalin Marinas
parent 98d2e1539b
commit 254a41c0ba
4 changed files with 117 additions and 1 deletions
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10
arch/arm64/include/asm/kexec.h
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@@ -43,6 +43,16 @@ static inline void crash_setup_regs(struct pt_regs *newregs,
/* Empty routine needed to avoid build errors. */
}
#if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION)
extern bool crash_is_nosave(unsigned long pfn);
extern void crash_prepare_suspend(void);
extern void crash_post_resume(void);
#else
static inline bool crash_is_nosave(unsigned long pfn) {return false; }
static inline void crash_prepare_suspend(void) {}
static inline void crash_post_resume(void) {}
#endif
#endif /* __ASSEMBLY__ */
#endif