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mm/fork: clear PASID for new mm
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. This patch was part of the series introducing mm->pasid, but got lost along the way [1]. It still makes sense to have it, because each address space has a different PASID. And the IOMMU code in iommu_sva_alloc_pasid() expects the pasid field of a new mm struct to be cleared. [1] https://lore.kernel.org/linux-iommu/YDgh53AcQHT+T3L0@otcwcpicx3.sc.intel.com/ Link: https://lkml.kernel.org/r/20210302103837.2562625-1-jean-philippe@linaro.org Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: Jacob Pan <jacob.jun.pan@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -23,6 +23,7 @@
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#endif
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#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
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#define INIT_PASID 0
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struct address_space;
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struct mem_cgroup;
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@ -994,6 +994,13 @@ static void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
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#endif
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}
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static void mm_init_pasid(struct mm_struct *mm)
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{
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#ifdef CONFIG_IOMMU_SUPPORT
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mm->pasid = INIT_PASID;
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#endif
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}
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static void mm_init_uprobes_state(struct mm_struct *mm)
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{
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#ifdef CONFIG_UPROBES
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@ -1024,6 +1031,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
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mm_init_cpumask(mm);
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mm_init_aio(mm);
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mm_init_owner(mm, p);
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mm_init_pasid(mm);
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RCU_INIT_POINTER(mm->exe_file, NULL);
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mmu_notifier_subscriptions_init(mm);
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init_tlb_flush_pending(mm);
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