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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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893f38d144
Jens found the following crash/regression:
[ 0.000000] found SMP MP-table at [ffff8800000fdd80] fdd80
[ 0.000000] Kernel panic - not syncing: Overlapping early reservations 12-f011 MP-table mpc to 0-fff BIOS data page
and
[ 0.000000] Kernel panic - not syncing: Overlapping early reservations 12-f011 MP-table mpc to 6000-7fff TRAMPOLINE
and bisected it to b24c2a9 ("x86: Move find_smp_config()
earlier and avoid bootmem usage").
It turns out the BIOS is using the first 64k for mptable,
without reserving it.
So try to find good range for the real-mode trampoline instead of
hard coding it, in case some bios tries to use that range for sth.
Reported-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Tested-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
LKML-Reference: <4B21630A.6000308@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
29 lines
728 B
C
29 lines
728 B
C
#ifndef _ASM_X86_TRAMPOLINE_H
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#define _ASM_X86_TRAMPOLINE_H
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_X86_TRAMPOLINE
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/*
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* Trampoline 80x86 program as an array.
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*/
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extern const unsigned char trampoline_data [];
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extern const unsigned char trampoline_end [];
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extern unsigned char *trampoline_base;
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extern unsigned long init_rsp;
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extern unsigned long initial_code;
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extern unsigned long initial_gs;
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#define TRAMPOLINE_SIZE roundup(trampoline_end - trampoline_data, PAGE_SIZE)
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extern unsigned long setup_trampoline(void);
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extern void __init reserve_trampoline_memory(void);
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#else
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static inline void reserve_trampoline_memory(void) {};
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#endif /* CONFIG_X86_TRAMPOLINE */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_TRAMPOLINE_H */
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