[tip: x86/pasid] mm: Add a pasid member to struct mm_struct

["tip-bot2 for Fenghua Yu" <tip-bot2@linutronix.de>]

The following commit has been merged into the x86/pasid branch of tip:

Commit-ID:     52ad9bc64c74167466e70e0df4b99ee5ccef0078
Gitweb:        https://git.kernel.org/tip/52ad9bc64c74167466e70e0df4b99ee5ccef0078
Author:        Fenghua Yu <fenghua.yu@intel.com>
AuthorDate:    Tue, 15 Sep 2020 09:30:11 -07:00
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Thu, 17 Sep 2020 20:22:15 +02:00

mm: Add a pasid member to struct mm_struct

A PASID is shared by all threads in a process. So the logical place to
keep track of it is in the mm_struct. Both ARM and x86 would use this
PASID.

 [ bp: Massage commit message. ]

Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/1600187413-163670-8-git-send-email-fenghua.yu@intel.com
---
 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 496c3ff..1ff0615 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -542,6 +542,10 @@ struct mm_struct {
 		atomic_long_t hugetlb_usage;
 #endif
 		struct work_struct async_put_work;
+
+#ifdef CONFIG_IOMMU_SUPPORT
+		u32 pasid;
+#endif
 	} __randomize_layout;
 
 	/*