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s390/mm: always force a load of the primary ASCE on context switch
The ASCE of an mm_struct can be modified after a task has been created,
e.g. via crst_table_downgrade for a compat process. The active_mm logic
to avoid the switch_mm call if the next task is a kernel thread can
lead to a situation where switch_mm is called where 'prev == next' is
true but 'prev->context.asce == next->context.asce' is not.
This can lead to a situation where a CPU uses the outdated ASCE to run
a task. The result can be a crash, endless loops and really subtle
problem due to TLBs being created with an invalid ASCE.
Cc: stable@kernel.org # v3.15+
Fixes: 53e857f308
("s390/mm,tlb: race of lazy TLB flush vs. recreation")
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
parent
03aa047ef2
commit
a38662084c
1 changed files with 2 additions and 3 deletions
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@ -90,8 +90,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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{
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int cpu = smp_processor_id();
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if (prev == next)
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return;
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S390_lowcore.user_asce = next->context.asce;
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cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
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/* Clear previous user-ASCE from CR1 and CR7 */
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@ -103,7 +101,8 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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__ctl_load(S390_lowcore.vdso_asce, 7, 7);
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clear_cpu_flag(CIF_ASCE_SECONDARY);
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}
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cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
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if (prev != next)
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cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
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}
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#define finish_arch_post_lock_switch finish_arch_post_lock_switch
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