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authorAlexander Gordeev <agordeev@linux.ibm.com>2022-07-20 07:24:03 +0200
committerAlexander Gordeev <agordeev@linux.ibm.com>2022-07-28 18:05:23 +0200
commit6f5c672d17f583b081e283927f5040f726c54598 (patch)
treee2d8a6ff6d31cffecf5866496897ccf6156ee78f /arch/s390/kernel
parentfc7fab3f9156df73cd5f2705f001451265453d34 (diff)
s390/smp: enforce lowcore protection on CPU restart
As result of commit 915fea04f932 ("s390/smp: enable DAT before CPU restart callback is called") the low-address protection bit gets mistakenly unset in control register 0 save area of the absolute zero memory. That area is used when manual PSW restart happened to hit an offline CPU. In this case the low-address protection for that CPU will be dropped. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Fixes: 915fea04f932 ("s390/smp: enable DAT before CPU restart callback is called") Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/setup.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 8d91eccc0963..792ba69032d5 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -508,8 +508,8 @@ static void __init setup_lowcore_dat_on(void)
S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
- __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
__ctl_set_bit(0, 28);
+ __ctl_store(S390_lowcore.cregs_save_area, 0, 15);
put_abs_lowcore(restart_flags, RESTART_FLAG_CTLREGS);
put_abs_lowcore(program_new_psw, lc->program_new_psw);
for (cr = 0; cr < ARRAY_SIZE(lc->cregs_save_area); cr++)