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ead1dec8ed
linux_dsm_epyc7002/arch/s390/kernel
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Heiko Carstens ead1dec8ed s390/ipl: revert Load Normal semantics for LPAR CCW-type re-IPL 
This reverts the two commits

7afbeb6df2 ("s390/ipl: always use load normal for CCW-type re-IPL")
0f7451ff3a ("s390/ipl: use load normal for LPAR re-ipl")

The two commits did not take into account that behavior of standby
memory changes fundamentally if the re-IPL method is changed from
Load Clear to Load Normal.

In case of the old re-IPL clear method all memory that was initially
in standby state will be put into standby state again within the
re-IPL process. Or in other words: memory that was brought online
before a re-IPL will be offline again after a reboot.

Given that we use different re-IPL methods depending on the hypervisor
and CCW-type vs SCSI re-IPL it is not easy to tell in advance when and
why memory will stay online or will be offline after a re-IPL.
This does also have other side effects, since memory that is online
from the beginning will be in ZONE_NORMAL by default vs ZONE_MOVABLE
for memory that is offline.

Therefore, before the change, a user could online and offline memory
easily since standby memory was always in ZONE_NORMAL.  After the
change, and a re-IPL, this depended on which memory parts were online
before the re-IPL.

From a usability point of view the current behavior is more than
suboptimal. Therefore revert these changes until we have a better
solution and get back to a consistent behavior. The bad thing about
this is that the time required for a re-IPL will be significantly
increased for configurations with several 100GB or 1TB of memory.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-06-12 16:26:01 +02:00
..
vdso32 s390/time: steer clocksource on STP sync events 2016-10-28 10:09:02 +02:00
vdso64 s390/time: steer clocksource on STP sync events 2016-10-28 10:09:02 +02:00
.gitignore s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
als.c s390/sclp: don't add new lines to each printed string 2017-02-08 14:13:20 +01:00
asm-offsets.c s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
audit.c [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
audit.h [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
base.S s390/kdump: fix nosmt kernel parameter 2015-06-25 09:39:26 +02:00
cache.c s390/cpuinfo: show dynamic and static cpu mhz 2016-06-13 15:58:17 +02:00
compat_audit.c [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
compat_linux.c s390: kernel: Audit and remove any unnecessary uses of module.h 2017-02-17 07:40:31 +01:00
compat_linux.h s390: add support for vector extension 2014-10-09 09:14:13 +02:00
compat_ptrace.h [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
compat_signal.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
compat_wrapper.c s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
cpcmd.c s390: kernel: Audit and remove any unnecessary uses of module.h 2017-02-17 07:40:31 +01:00
crash_dump.c s390/kdump: Add final note 2017-03-28 16:54:31 +02:00
debug.c s390: convert debug_info.ref_count from atomic_t to refcount_t 2017-05-11 16:35:32 +02:00
diag.c s390: kernel: Audit and remove any unnecessary uses of module.h 2017-02-17 07:40:31 +01:00
dis.c s390: kernel: Audit and remove any unnecessary uses of module.h 2017-02-17 07:40:31 +01:00
dumpstack.c s390/dumpstack: remove raw stack dump 2017-06-12 16:26:01 +02:00
early_printk.c s390/sclp: make early sclp code readable 2017-02-08 14:13:19 +01:00
early.c s390/spinlock: remove compare and delay instruction 2017-04-12 08:43:33 +02:00
ebcdic.c s390: kernel: Audit and remove any unnecessary uses of module.h 2017-02-17 07:40:31 +01:00
entry.h s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
entry.S s390/kvm: do not rely on the ILC on kvm host protection fauls 2017-05-17 12:34:03 +02:00
fpu.c s390/fpu: improve kernel_fpu_[begin|end] 2016-08-29 11:05:01 +02:00
ftrace.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-05-16 09:24:44 -07:00
guarded_storage.c s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
head64.S s390/cpumf: simplify detection of guest samples 2017-04-05 10:11:38 +02:00
head_kdump.S s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
head.S s390/facilities: get rid of __ASSEMBLY__ in facility header file 2017-03-22 08:29:18 +01:00
idle.c sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h> 2017-03-02 08:42:39 +01:00
ipl.c s390/ipl: revert Load Normal semantics for LPAR CCW-type re-IPL 2017-06-12 16:26:01 +02:00
irq.c s390: kernel: Audit and remove any unnecessary uses of module.h 2017-02-17 07:40:31 +01:00
jump_label.c s390: kernel: Audit and remove any unnecessary uses of module.h 2017-02-17 07:40:31 +01:00
kdebugfs.c s390/debugfs: introduce top-level 's390' directory 2017-03-22 08:29:15 +01:00
kprobes.c s390: use set_memory.h header 2017-05-08 17:15:13 -07:00
lgr.c s390: kernel: make lgr explicitly non-modular 2016-10-31 17:55:42 +01:00
machine_kexec.c s390: use set_memory.h header 2017-05-08 17:15:13 -07:00
Makefile s390/debugfs: introduce top-level 's390' directory 2017-03-22 08:29:15 +01:00
mcount.S s390: move exports to definitions 2016-08-07 23:47:20 -04:00
module.c s390: add no-execute support 2017-02-08 14:13:25 +01:00
nmi.c s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
os_info.c s390: proper type casts for csum_partial invocations 2017-01-16 07:27:53 +01:00
perf_cpum_cf_events.c s390/cpum_cf: correct variable naming (cleanup) 2017-03-31 07:53:33 +02:00
perf_cpum_cf.c s390/cpum_cf: make hw_perf_event_update() a void function 2017-03-31 07:53:35 +02:00
perf_cpum_sf.c cpumask: make "nr_cpumask_bits" unsigned 2017-05-08 17:15:11 -07:00
perf_event.c s390/perf: fix null string in perf list pmu command 2017-06-12 16:26:00 +02:00
pgm_check.S s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
process.c s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
processor.c s390/cpuinfo: show facilities as reported by stfle 2017-03-22 08:29:02 +01:00
ptrace.c s390/ptrace: guarded storage regset for the current task 2017-06-12 16:25:59 +02:00
reipl.S s390/dump: rework CPU register dump code 2015-11-27 09:24:14 +01:00
relocate_kernel.S s390: remove "64" suffix from a couple of files 2015-03-25 11:49:34 +01:00
runtime_instr.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
setup.c s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
signal.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
smp.c s390/smp: fix false positive kmemleak of mcesa data structure 2017-06-12 16:25:58 +02:00
stacktrace.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
suspend.c PCI: Include <linux/pci.h>, not <asm/pci.h> 2015-06-08 07:55:03 -05:00
swsusp.S s390/sclp: don't add new lines to each printed string 2017-02-08 14:13:20 +01:00
sys_s390.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
syscalls.S s390: add a system call for guarded storage 2017-03-22 08:14:25 +01:00
sysinfo.c s390/sysinfo: provide remaining stsi information via debugfs 2017-03-22 08:29:17 +01:00
time.c s390/time: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:20 -07:00
topology.c s390/sysinfo,topology: provide raw stsi 15,1,x data via debugfs 2017-03-22 08:29:15 +01:00
trace.c s390/diag: avoid lockdep recursion 2016-02-11 13:05:56 +01:00
traps.c s390: add missing header includes for type checking 2017-06-12 16:25:55 +02:00
uprobes.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
vdso.c s390/vdso: use _install_special_mapping to establish vdso 2017-06-12 16:25:57 +02:00
vmlinux.lds.S s390: move _text symbol to address higher than zero 2017-05-09 10:44:38 +02:00
vtime.c s390/cputime: simplify account_system_index_scaled 2017-06-12 16:25:57 +02:00