diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-08-17 08:15:16 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-09-06 09:24:42 +0200 |
| commit | 60f07c8ec5fae06c23e9fd7bab67dabce92b3414 (patch) | |
| tree | 3c189bb7d158caba68c36b467603f94b243eea8f /arch/s390 | |
| parent | s390/mm: fix local TLB flushing vs. detach of an mm address space (diff) | |
| download | linux-60f07c8ec5fae06c23e9fd7bab67dabce92b3414.tar.xz linux-60f07c8ec5fae06c23e9fd7bab67dabce92b3414.zip | |
s390/mm: fix race on mm->context.flush_mm
The order in __tlb_flush_mm_lazy is to flush TLB first and then clear
the mm->context.flush_mm bit. This can lead to missed flushes as the
bit can be set anytime, the order needs to be the other way aronud.
But this leads to a different race, __tlb_flush_mm_lazy may be called
on two CPUs concurrently. If mm->context.flush_mm is cleared first then
another CPU can bypass __tlb_flush_mm_lazy although the first CPU has
not done the flush yet. In a virtualized environment the time until the
flush is finally completed can be arbitrarily long.
Add a spinlock to serialize __tlb_flush_mm_lazy and use the function
in finish_arch_post_lock_switch as well.
Cc: <stable@vger.kernel.org>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/mmu.h | 2 | ||||
| -rw-r--r-- | arch/s390/include/asm/mmu_context.h | 4 | ||||
| -rw-r--r-- | arch/s390/include/asm/tlbflush.h | 4 |
3 files changed, 7 insertions, 3 deletions
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h index bd6f30304518..3525fe6e7e4c 100644 --- a/arch/s390/include/asm/mmu.h +++ b/arch/s390/include/asm/mmu.h @@ -5,6 +5,7 @@ #include <linux/errno.h> typedef struct { + spinlock_t lock; cpumask_t cpu_attach_mask; atomic_t flush_count; unsigned int flush_mm; @@ -27,6 +28,7 @@ typedef struct { } mm_context_t; #define INIT_MM_CONTEXT(name) \ + .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock), \ .context.pgtable_lock = \ __SPIN_LOCK_UNLOCKED(name.context.pgtable_lock), \ .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \ diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h index 8823e35f69a9..484efe8f4234 100644 --- a/arch/s390/include/asm/mmu_context.h +++ b/arch/s390/include/asm/mmu_context.h @@ -17,6 +17,7 @@ static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { + spin_lock_init(&mm->context.lock); spin_lock_init(&mm->context.pgtable_lock); INIT_LIST_HEAD(&mm->context.pgtable_list); spin_lock_init(&mm->context.gmap_lock); @@ -121,8 +122,7 @@ static inline void finish_arch_post_lock_switch(void) while (atomic_read(&mm->context.flush_count)) cpu_relax(); cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); - if (mm->context.flush_mm) - __tlb_flush_mm(mm); + __tlb_flush_mm_lazy(mm); preempt_enable(); } set_fs(current->thread.mm_segment); diff --git a/arch/s390/include/asm/tlbflush.h b/arch/s390/include/asm/tlbflush.h index 16fe2a3d9a03..b08d5bc2666e 100644 --- a/arch/s390/include/asm/tlbflush.h +++ b/arch/s390/include/asm/tlbflush.h @@ -101,10 +101,12 @@ static inline void __tlb_flush_kernel(void) static inline void __tlb_flush_mm_lazy(struct mm_struct * mm) { + spin_lock(&mm->context.lock); if (mm->context.flush_mm) { - __tlb_flush_mm(mm); mm->context.flush_mm = 0; + __tlb_flush_mm(mm); } + spin_unlock(&mm->context.lock); } /* |