From: Fenghua Yu <redacted>

PASID is shared by all threads in a process. So the logical place to keep
track of it is in the "mm". Both ARM and X86 need to use the PASID in the
"mm".

Suggested-by: Christoph Hellwig <redacted>
Signed-off-by: Fenghua Yu <redacted>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
https://lore.kernel.org/linux-iommu/1592418233-17762-9-git-send-email-fenghua.yu@intel.com/ (local)
---
 include/linux/mm_types.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 64ede5f150dc5..1ad0e54ebbbaa 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h

@@ -538,6 +538,10 @@ struct mm_struct {
 		atomic_long_t hugetlb_usage;
 #endif
 		struct work_struct async_put_work;
+
+#ifdef CONFIG_IOMMU_SUPPORT
+		unsigned int pasid;
+#endif
 	} __randomize_layout;
 
 	/*

-- 
2.27.0


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