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Subject[patch 9/9] kexec-tools: Add s390 kdump support
From: Michael Holzheu <holzheu@linux.vnet.ibm.com>

This patch adds kdump support for s390 to the kexec tool and enables the
"--load-panic" option. When loading the kdump kernel and ramdisk we add the
address of the crashkernel memory to the normal load address.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
kexec/arch/s390/kexec-image.c | 16 +++++++++++++---
kexec/arch/s390/kexec-s390.c | 24 +++++++++++++++++++++---
2 files changed, 34 insertions(+), 6 deletions(-)
--- a/kexec/arch/s390/kexec-image.c
+++ b/kexec/arch/s390/kexec-image.c
@@ -18,6 +18,7 @@
#include <unistd.h>
#include <getopt.h>
#include "../../kexec.h"
+#include "../../kexec-syscall.h"
#include "kexec-s390.h"
#include <arch/options.h>

@@ -32,6 +33,7 @@ image_s390_load(int argc, char **argv, c
int command_line_len;
off_t ramdisk_len;
unsigned int ramdisk_origin;
+ uint64_t crash_base, crash_end;
int opt;

static const struct option options[] =
@@ -47,6 +49,7 @@ image_s390_load(int argc, char **argv, c
command_line = NULL;
ramdisk_len = 0;
ramdisk_origin = 0;
+ crash_base = 0;

while ((opt = getopt_long(argc,argv,short_options,options,0)) != -1) {
switch(opt) {
@@ -71,10 +74,16 @@ image_s390_load(int argc, char **argv, c
return -1;
}
}
+ if (info->kexec_flags & KEXEC_ON_CRASH) {
+ if (parse_iomem_single("Crash kernel\n", &crash_base,
+ &crash_end))
+ return -1;
+ }

/* Add kernel segment */
add_segment(info, kernel_buf + IMAGE_READ_OFFSET,
- kernel_size - IMAGE_READ_OFFSET, IMAGE_READ_OFFSET,
+ kernel_size - IMAGE_READ_OFFSET,
+ crash_base + IMAGE_READ_OFFSET,
kernel_size - IMAGE_READ_OFFSET);

/* We do want to change the kernel image */
@@ -88,7 +97,8 @@ image_s390_load(int argc, char **argv, c
return -1;
}
ramdisk_origin = RAMDISK_ORIGIN_ADDR;
- add_segment(info, rd_buffer, ramdisk_len, RAMDISK_ORIGIN_ADDR, ramdisk_len);
+ add_segment(info, rd_buffer, ramdisk_len,
+ crash_base + RAMDISK_ORIGIN_ADDR, ramdisk_len);
}

/* Register the ramdisk in the kernel. */
@@ -111,7 +121,7 @@ image_s390_load(int argc, char **argv, c
memcpy(krnl_buffer + COMMAND_LINE_OFFS, command_line, strlen(command_line));
}

- info->entry = (void *) IMAGE_READ_OFFSET;
+ info->entry = (void *) crash_base + IMAGE_READ_OFFSET;

return 0;
}
--- a/kexec/arch/s390/kexec-s390.c
+++ b/kexec/arch/s390/kexec-s390.c
@@ -37,8 +37,9 @@ static struct memory_range memory_range[
*/

int get_memory_ranges(struct memory_range **range, int *ranges,
- unsigned long UNUSED(flags))
+ unsigned long flags)
{
+ char crash_kernel[] = "Crash kernel\n";
char sys_ram[] = "System RAM\n";
const char *iomem = proc_iomem();
FILE *fp;
@@ -62,7 +63,9 @@ int get_memory_ranges(struct memory_rang

sscanf(line,"%Lx-%Lx : %n", &start, &end, &cons);
str = line+cons;
- if(memcmp(str,sys_ram,strlen(sys_ram)) == 0) {
+ if((memcmp(str,sys_ram,strlen(sys_ram)) == 0) ||
+ ((flags & KEXEC_ON_CRASH) &&
+ memcmp(str,crash_kernel,strlen(crash_kernel)) == 0)) {
memory_range[current_range].start = start;
memory_range[current_range].end = end;
memory_range[current_range].type = RANGE_RAM;
@@ -76,6 +79,18 @@ int get_memory_ranges(struct memory_rang
*range = memory_range;
*ranges = current_range;

+ if ((flags & KEXEC_ON_CRASH) && !(flags & KEXEC_PRESERVE_CONTEXT)) {
+ uint64_t start, end;
+
+ if (parse_iomem_single("Crash kernel\n", &start, &end)) {
+ fprintf(stderr, "parse_iomem_single failed.\n");
+ return -1;
+ }
+ if (start > mem_min)
+ mem_min = start;
+ if (end < mem_max)
+ mem_max = end;
+ }
return 0;
}

@@ -112,5 +127,8 @@ void arch_update_purgatory(struct kexec_

int is_crashkernel_mem_reserved(void)
{
- return 0; /* kdump is not supported on this platform (yet) */
+ uint64_t start, end;
+
+ return parse_iomem_single("Crash kernel\n", &start, &end) == 0 ?
+ (start != end) : 0;
}


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