Messages in this thread Patch in this message | | | From | Fenghua Yu <> | Subject | [PATCH v3 09/13] fork: Clear PASID for new mm | Date | Wed, 17 Jun 2020 11:23:49 -0700 |
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When a new mm is created, its PASID should be cleared, i.e. the PASID is initialized to its init state 0 on both ARM and X86.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Reviewed-by: Tony Luck <tony.luck@intel.com> --- v2: - Add this patch to initialize PASID value for a new mm.
include/linux/mm_types.h | 2 ++ kernel/fork.c | 8 ++++++++ 2 files changed, 10 insertions(+)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 1ad0e54ebbba..9a209c1cf7ec 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -22,6 +22,8 @@ #endif #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) +/* Initial PASID value is 0. */ +#define INIT_PASID 0 struct address_space; struct mem_cgroup; diff --git a/kernel/fork.c b/kernel/fork.c index 142b23645d82..43b5f112604d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1007,6 +1007,13 @@ static void mm_init_owner(struct mm_struct *mm, struct task_struct *p) #endif } +static void mm_init_pasid(struct mm_struct *mm) +{ +#ifdef CONFIG_IOMMU_SUPPORT + mm->pasid = INIT_PASID; +#endif +} + static void mm_init_uprobes_state(struct mm_struct *mm) { #ifdef CONFIG_UPROBES @@ -1035,6 +1042,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, mm_init_cpumask(mm); mm_init_aio(mm); mm_init_owner(mm, p); + mm_init_pasid(mm); RCU_INIT_POINTER(mm->exe_file, NULL); mmu_notifier_subscriptions_init(mm); init_tlb_flush_pending(mm); -- 2.19.1
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