From: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
This patch defines for s390 an ABI defined pointer to the vmcoreinfo note at
a well known address. With this patch tools are able to find this information
in dumps created by stand-alone or hypervisor dump tools.
Signed-off-by: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
---
arch/s390/include/asm/lowcore.h | 3 ++-
arch/s390/kernel/setup.c | 8 ++++++++
2 files changed, 10 insertions(+), 1 deletion(-)
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -287,7 +287,8 @@ struct _lowcore {
*/
__u64 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e08 */
- __u8 pad_0x0e0c[0x0f00-0x0e0c]; /* 0x0e0c */
+ __u64 vmcore_info; /* 0x0e0c */
+ __u8 pad_0x0e14[0x0f00-0x0e14]; /* 0x0e14 */
/* Extended facility list */
__u64 stfle_fac_list[32]; /* 0x0f00 */
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -559,6 +559,13 @@ static void __init setup_restart_psw(voi
copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
}
+static void __init setup_vmcoreinfo(void)
+{
+ unsigned long ptr = paddr_vmcoreinfo_note();
+
+ copy_to_absolute_zero(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
+}
+
#ifdef CONFIG_CRASH_DUMP
/*
@@ -1019,6 +1026,7 @@ setup_arch(char **cmdline_p)
reserve_crashkernel();
setup_memory();
setup_resources();
+ setup_vmcoreinfo();
setup_restart_psw();
setup_lowcore();
--
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