Diffstat (limited to 'Documentation/kdump/kdump.txt')
1 files changed, 32 insertions, 3 deletions
diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
index 7a9e0b4b2903..506c7390c2b9 100644
@@ -17,8 +17,8 @@ You can use common commands, such as cp and scp, to copy the
memory image to a dump file on the local disk, or across the network to
a remote system.
-Kdump and kexec are currently supported on the x86, x86_64, ppc64 and ia64
+Kdump and kexec are currently supported on the x86, x86_64, ppc64, ia64,
+and s390x architectures.
When the system kernel boots, it reserves a small section of memory for
the dump-capture kernel. This ensures that ongoing Direct Memory Access
@@ -34,11 +34,18 @@ Similarly on PPC64 machines first 32KB of physical memory is needed for
booting regardless of where the kernel is loaded and to support 64K page
size kexec backs up the first 64KB memory.
+For s390x, when kdump is triggered, the crashkernel region is exchanged
+with the region [0, crashkernel region size] and then the kdump kernel
+runs in [0, crashkernel region size]. Therefore no relocatable kernel is
+needed for s390x.
All of the necessary information about the system kernel's core image is
encoded in the ELF format, and stored in a reserved area of memory
before a crash. The physical address of the start of the ELF header is
passed to the dump-capture kernel through the elfcorehdr= boot
+parameter. Optionally the size of the ELF header can also be passed
+when using the elfcorehdr=[size[KMG]@]offset[KMG] syntax.
With the dump-capture kernel, you can access the memory image, or "old
memory," in two ways:
@@ -291,6 +298,10 @@ Boot into System Kernel
The region may be automatically placed on ia64, see the
dump-capture kernel config option notes above.
+ On s390x, typically use "crashkernel=xxM". The value of xx is dependent
+ on the memory consumption of the kdump system. In general this is not
+ dependent on the memory size of the production system.
Load the Dump-capture Kernel
@@ -308,6 +319,8 @@ For ppc64:
- Use vmlinux
- Use vmlinux or vmlinuz.gz
+ - Use image or bzImage
If you are using a uncompressed vmlinux image then use following command
@@ -337,6 +350,8 @@ For i386, x86_64 and ia64:
"1 maxcpus=1 noirqdistrib reset_devices"
+ "1 maxcpus=1 cgroup_disable=memory"
Notes on loading the dump-capture kernel:
@@ -362,6 +377,20 @@ Notes on loading the dump-capture kernel:
dump. Hence generally it is useful either to build a UP dump-capture
kernel or specify maxcpus=1 option while loading dump-capture kernel.
+* For s390x there are two kdump modes: If a ELF header is specified with
+ the elfcorehdr= kernel parameter, it is used by the kdump kernel as it
+ is done on all other architectures. If no elfcorehdr= kernel parameter is
+ specified, the s390x kdump kernel dynamically creates the header. The
+ second mode has the advantage that for CPU and memory hotplug, kdump has
+ not to be reloaded with kexec_load().
+* For s390x systems with many attached devices the "cio_ignore" kernel
+ parameter should be used for the kdump kernel in order to prevent allocation
+ of kernel memory for devices that are not relevant for kdump. The same
+ applies to systems that use SCSI/FCP devices. In that case the
+ "allow_lun_scan" zfcp module parameter should be set to zero before
+ setting FCP devices online.