From: Fenghua Yu <fenghua.yu@xxxxxxxxx> 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 <hch@xxxxxxxxxxxxx> Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx> Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx> --- https://lore.kernel.org/linux-iommu/1592418233-17762-9-git-send-email-fenghua.yu@xxxxxxxxx/ --- 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
