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Date: Thu, 27 Aug 2020 08:06:32 -0700 From: Fenghua Yu <fenghua.yu@...el.com> To: "Thomas Gleixner" <tglx@...utronix.de>, "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>, "H Peter Anvin" <hpa@...or.com>, "Andy Lutomirski" <luto@...nel.org>, "Jean-Philippe Brucker" <jean-philippe@...aro.org>, "Christoph Hellwig" <hch@...radead.org>, "Peter Zijlstra" <peterz@...radead.org>, "David Woodhouse" <dwmw2@...radead.org>, "Lu Baolu" <baolu.lu@...ux.intel.com>, "Dave Hansen" <dave.hansen@...el.com>, "Tony Luck" <tony.luck@...el.com>, "Ashok Raj" <ashok.raj@...el.com>, "Jacob Jun Pan" <jacob.jun.pan@...el.com>, "Dave Jiang" <dave.jiang@...el.com>, "Sohil Mehta" <sohil.mehta@...el.com>, "Ravi V Shankar" <ravi.v.shankar@...el.com> Cc: "linux-kernel" <linux-kernel@...r.kernel.org>, "x86" <x86@...nel.org>, iommu@...ts.linux-foundation.org, Fenghua Yu <fenghua.yu@...el.com> Subject: [PATCH v7 7/9] mm: Define pasid in mm 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@...radead.org> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com> Reviewed-by: Tony Luck <tony.luck@...el.com> --- v4: - Change PASID type to u32 (Christoph) v3: - Change CONFIG_PCI_PASID to CONFIG_IOMMU_SUPPORT because non-PCI device can have PASID in ARM (Jean) v2: - This new patch moves "pasid" from x86 specific mm_context_t to generic struct mm_struct per Christopher's comment: https://lore.kernel.org/linux-iommu/20200414170252.714402-1-jean-philippe@linaro.org/T/#mb57110ffe1aaa24750eeea4f93b611f0d1913911 - Jean-Philippe Brucker released a virtually same patch. I still put this patch in the series for better review. The upstream kernel only needs one of the two patches eventually. https://lore.kernel.org/linux-iommu/20200519175502.2504091-2-jean-philippe@linaro.org/ - Change CONFIG_IOASID to CONFIG_PCI_PASID (Ashok) 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 496c3ff97cce..1ff0615ef19f 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; /* -- 2.19.1
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