[S390] Export vmcoreinfo note
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@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index e85c911..4f990a5 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -151,10 +151,11 @@
*/
__u32 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e04 */
+ __u32 vmcore_info; /* 0x0e08 */
/* 64 bit save area */
- __u64 save_area_64; /* 0x0e08 */
- __u8 pad_0x0e10[0x0f00-0x0e10]; /* 0x0e10 */
+ __u64 save_area_64; /* 0x0e0c */
+ __u8 pad_0x0e14[0x0f00-0x0e14]; /* 0x0e14 */
/* Extended facility list */
__u64 stfle_fac_list[32]; /* 0x0f00 */
@@ -290,10 +291,11 @@
*/
__u64 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e08 */
+ __u64 vmcore_info; /* 0x0e0c */
/* 64 bit save area */
- __u64 save_area_64; /* 0x0e0c */
- __u8 pad_0x0e14[0x0f00-0x0e14]; /* 0x0e14 */
+ __u64 save_area_64; /* 0x0e14 */
+ __u8 pad_0x0e1c[0x0f00-0x0e1c]; /* 0x0e1c */
/* Extended facility list */
__u64 stfle_fac_list[32]; /* 0x0f00 */
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index b5a30412..63c81de 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -558,6 +558,15 @@
copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
}
+static void __init setup_vmcoreinfo(void)
+{
+#ifdef CONFIG_KEXEC
+ unsigned long ptr = paddr_vmcoreinfo_note();
+
+ copy_to_absolute_zero(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
+#endif
+}
+
#ifdef CONFIG_CRASH_DUMP
/*
@@ -1022,6 +1031,7 @@
reserve_crashkernel();
setup_memory();
setup_resources();
+ setup_vmcoreinfo();
setup_restart_psw();
setup_lowcore();