Merge branch 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 kdump update from Ingo Molnar: "This includes two changes: - Raise the crash kernel reservation limit from from ~896MB to ~4GB. Only very old (and already known-broken) kexec-tools is supposed to be affected by this negatively. - Allow higher than 4GB crash kernel allocations when low allocations fail" * 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/kdump: Fall back to reserve high crashkernel memory x86/kdump: Have crashkernel=X reserve under 4G by default
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commit
e913c4a4c2
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@ -704,8 +704,11 @@
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upon panic. This parameter reserves the physical
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memory region [offset, offset + size] for that kernel
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image. If '@offset' is omitted, then a suitable offset
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is selected automatically. Check
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Documentation/kdump/kdump.txt for further details.
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is selected automatically.
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[KNL, x86_64] select a region under 4G first, and
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fall back to reserve region above 4G when '@offset'
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hasn't been specified.
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See Documentation/kdump/kdump.txt for further details.
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crashkernel=range1:size1[,range2:size2,...][@offset]
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[KNL] Same as above, but depends on the memory
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@ -71,6 +71,7 @@
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#include <linux/tboot.h>
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#include <linux/jiffies.h>
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#include <linux/mem_encrypt.h>
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#include <linux/sizes.h>
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#include <linux/usb/xhci-dbgp.h>
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#include <video/edid.h>
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@ -448,18 +449,17 @@ static void __init memblock_x86_reserve_range_setup_data(void)
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#ifdef CONFIG_KEXEC_CORE
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/* 16M alignment for crash kernel regions */
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#define CRASH_ALIGN (16 << 20)
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#define CRASH_ALIGN SZ_16M
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/*
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* Keep the crash kernel below this limit. On 32 bits earlier kernels
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* would limit the kernel to the low 512 MiB due to mapping restrictions.
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* On 64bit, old kexec-tools need to under 896MiB.
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*/
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#ifdef CONFIG_X86_32
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# define CRASH_ADDR_LOW_MAX (512 << 20)
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# define CRASH_ADDR_HIGH_MAX (512 << 20)
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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 (896UL << 20)
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# define CRASH_ADDR_LOW_MAX SZ_4G
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# define CRASH_ADDR_HIGH_MAX MAXMEM
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#endif
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@ -541,21 +541,27 @@ static void __init reserve_crashkernel(void)
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}
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/* 0 means: find the address automatically */
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if (crash_base <= 0) {
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if (!crash_base) {
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/*
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* Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
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* as old kexec-tools loads bzImage below that, unless
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* "crashkernel=size[KMG],high" is specified.
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* crashkernel=x,high reserves memory over 4G, also allocates
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* 256M extra low memory for DMA buffers and swiotlb.
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* But the extra memory is not required for all machines.
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* So try low memory first and fall back to high memory
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* unless "crashkernel=size[KMG],high" is specified.
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*/
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if (!high)
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crash_base = memblock_find_in_range(CRASH_ALIGN,
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high ? CRASH_ADDR_HIGH_MAX
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: CRASH_ADDR_LOW_MAX,
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CRASH_ADDR_LOW_MAX,
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crash_size, CRASH_ALIGN);
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if (!crash_base)
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crash_base = memblock_find_in_range(CRASH_ALIGN,
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CRASH_ADDR_HIGH_MAX,
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crash_size, CRASH_ALIGN);
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if (!crash_base) {
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pr_info("crashkernel reservation failed - No suitable area found.\n");
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return;
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}
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} else {
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unsigned long long start;
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