mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
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
This commit is contained in:
commit
e913c4a4c2
2 changed files with 24 additions and 15 deletions
|
@ -704,8 +704,11 @@
|
|||
upon panic. This parameter reserves the physical
|
||||
memory region [offset, offset + size] for that kernel
|
||||
image. If '@offset' is omitted, then a suitable offset
|
||||
is selected automatically. Check
|
||||
Documentation/kdump/kdump.txt for further details.
|
||||
is selected automatically.
|
||||
[KNL, x86_64] select a region under 4G first, and
|
||||
fall back to reserve region above 4G when '@offset'
|
||||
hasn't been specified.
|
||||
See Documentation/kdump/kdump.txt for further details.
|
||||
|
||||
crashkernel=range1:size1[,range2:size2,...][@offset]
|
||||
[KNL] Same as above, but depends on the memory
|
||||
|
|
|
@ -71,6 +71,7 @@
|
|||
#include <linux/tboot.h>
|
||||
#include <linux/jiffies.h>
|
||||
#include <linux/mem_encrypt.h>
|
||||
#include <linux/sizes.h>
|
||||
|
||||
#include <linux/usb/xhci-dbgp.h>
|
||||
#include <video/edid.h>
|
||||
|
@ -448,18 +449,17 @@ static void __init memblock_x86_reserve_range_setup_data(void)
|
|||
#ifdef CONFIG_KEXEC_CORE
|
||||
|
||||
/* 16M alignment for crash kernel regions */
|
||||
#define CRASH_ALIGN (16 << 20)
|
||||
#define CRASH_ALIGN SZ_16M
|
||||
|
||||
/*
|
||||
* Keep the crash kernel below this limit. On 32 bits earlier kernels
|
||||
* would limit the kernel to the low 512 MiB due to mapping restrictions.
|
||||
* On 64bit, old kexec-tools need to under 896MiB.
|
||||
*/
|
||||
#ifdef CONFIG_X86_32
|
||||
# define CRASH_ADDR_LOW_MAX (512 << 20)
|
||||
# define CRASH_ADDR_HIGH_MAX (512 << 20)
|
||||
# define CRASH_ADDR_LOW_MAX SZ_512M
|
||||
# define CRASH_ADDR_HIGH_MAX SZ_512M
|
||||
#else
|
||||
# define CRASH_ADDR_LOW_MAX (896UL << 20)
|
||||
# define CRASH_ADDR_LOW_MAX SZ_4G
|
||||
# define CRASH_ADDR_HIGH_MAX MAXMEM
|
||||
#endif
|
||||
|
||||
|
@ -541,21 +541,27 @@ static void __init reserve_crashkernel(void)
|
|||
}
|
||||
|
||||
/* 0 means: find the address automatically */
|
||||
if (crash_base <= 0) {
|
||||
if (!crash_base) {
|
||||
/*
|
||||
* Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
|
||||
* as old kexec-tools loads bzImage below that, unless
|
||||
* "crashkernel=size[KMG],high" is specified.
|
||||
* crashkernel=x,high reserves memory over 4G, also allocates
|
||||
* 256M extra low memory for DMA buffers and swiotlb.
|
||||
* But the extra memory is not required for all machines.
|
||||
* So try low memory first and fall back to high memory
|
||||
* unless "crashkernel=size[KMG],high" is specified.
|
||||
*/
|
||||
crash_base = memblock_find_in_range(CRASH_ALIGN,
|
||||
high ? CRASH_ADDR_HIGH_MAX
|
||||
: CRASH_ADDR_LOW_MAX,
|
||||
crash_size, CRASH_ALIGN);
|
||||
if (!high)
|
||||
crash_base = memblock_find_in_range(CRASH_ALIGN,
|
||||
CRASH_ADDR_LOW_MAX,
|
||||
crash_size, CRASH_ALIGN);
|
||||
if (!crash_base)
|
||||
crash_base = memblock_find_in_range(CRASH_ALIGN,
|
||||
CRASH_ADDR_HIGH_MAX,
|
||||
crash_size, CRASH_ALIGN);
|
||||
if (!crash_base) {
|
||||
pr_info("crashkernel reservation failed - No suitable area found.\n");
|
||||
return;
|
||||
}
|
||||
|
||||
} else {
|
||||
unsigned long long start;
|
||||
|
||||
|
|
Loading…
Reference in a new issue