9c08a2a139
With the help of newly changed function parse_crashkernel() and generic reserve_crashkernel_generic(), crashkernel reservation can be simplified by steps: 1) Add a new header file <asm/crash_core.h>, and define CRASH_ALIGN, CRASH_ADDR_LOW_MAX, CRASH_ADDR_HIGH_MAX and DEFAULT_CRASH_KERNEL_LOW_SIZE in <asm/crash_core.h>; 2) Add arch_reserve_crashkernel() to call parse_crashkernel() and reserve_crashkernel_generic(), and do the ARCH specific work if needed. 3) Add ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION Kconfig in arch/x86/Kconfig. When adding DEFAULT_CRASH_KERNEL_LOW_SIZE, add crash_low_size_default() to calculate crashkernel low memory because x86_64 has special requirement. The old reserve_crashkernel_low() and reserve_crashkernel() can be removed. [bhe@redhat.com: move crash_low_size_default() code into <asm/crash_core.h>] Link: https://lkml.kernel.org/r/ZQpeAjOmuMJBFw1/@MiWiFi-R3L-srv Link: https://lkml.kernel.org/r/20230914033142.676708-7-bhe@redhat.com Signed-off-by: Baoquan He <bhe@redhat.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chen Jiahao <chenjiahao16@huawei.com> Cc: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _X86_CRASH_CORE_H
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#define _X86_CRASH_CORE_H
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/* 16M alignment for crash kernel regions */
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#define CRASH_ALIGN SZ_16M
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/*
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* Keep the crash kernel below this limit.
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*
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* Earlier 32-bits kernels would limit the kernel to the low 512 MB range
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* due to mapping restrictions.
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*
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* 64-bit kdump kernels need to be restricted to be under 64 TB, which is
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* the upper limit of system RAM in 4-level paging mode. Since the kdump
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* jump could be from 5-level paging to 4-level paging, the jump will fail if
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* the kernel is put above 64 TB, and during the 1st kernel bootup there's
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* no good way to detect the paging mode of the target kernel which will be
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* loaded for dumping.
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*/
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extern unsigned long swiotlb_size_or_default(void);
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#ifdef CONFIG_X86_32
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# define CRASH_ADDR_LOW_MAX SZ_512M
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# define CRASH_ADDR_HIGH_MAX SZ_512M
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#else
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# define CRASH_ADDR_LOW_MAX SZ_4G
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# define CRASH_ADDR_HIGH_MAX SZ_64T
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#endif
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# define DEFAULT_CRASH_KERNEL_LOW_SIZE crash_low_size_default()
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static inline unsigned long crash_low_size_default(void)
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{
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#ifdef CONFIG_X86_64
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return max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
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#else
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return 0;
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#endif
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}
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#endif /* _X86_CRASH_CORE_H */
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