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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