diff mbox series

[v10,01/13] mm: Define pasid in mm

Message ID 20200918101852.582559-2-jean-philippe@linaro.org (mailing list archive)
State New, archived
Headers show
Series iommu: Shared Virtual Addressing for SMMUv3 (PT sharing part) | expand

Commit Message

Jean-Philippe Brucker Sept. 18, 2020, 10:18 a.m. UTC 
From: Fenghua Yu <fenghua.yu@intel.com>

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@infradead.org>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
https://lore.kernel.org/linux-iommu/1600187413-163670-8-git-send-email-fenghua.yu@intel.com/
---
 include/linux/mm_types.h | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Will Deacon Sept. 28, 2020, 10:22 p.m. UTC | #1 
On Fri, Sep 18, 2020 at 12:18:41PM +0200, Jean-Philippe Brucker wrote:
> From: Fenghua Yu <fenghua.yu@intel.com>
> 
> 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@infradead.org>
> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
> Reviewed-by: Tony Luck <tony.luck@intel.com>
> ---
> https://lore.kernel.org/linux-iommu/1600187413-163670-8-git-send-email-fenghua.yu@intel.com/
> ---
>  include/linux/mm_types.h | 4 ++++
>  1 file changed, 4 insertions(+)

Acked-by: Will Deacon <will@kernel.org>

Will
Fenghua Yu Sept. 28, 2020, 10:43 p.m. UTC | #2 
Hi, Will and Jean,

On Mon, Sep 28, 2020 at 11:22:51PM +0100, Will Deacon wrote:
> On Fri, Sep 18, 2020 at 12:18:41PM +0200, Jean-Philippe Brucker wrote:
> > From: Fenghua Yu <fenghua.yu@intel.com>
> > 
> > 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@infradead.org>
> > Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
> > Reviewed-by: Tony Luck <tony.luck@intel.com>
> > ---
> > https://lore.kernel.org/linux-iommu/1600187413-163670-8-git-send-email-fenghua.yu@intel.com/
> > ---
> >  include/linux/mm_types.h | 4 ++++
> >  1 file changed, 4 insertions(+)
> 
> Acked-by: Will Deacon <will@kernel.org>

FYI. This patch is in x86 maintainers tree tip:x86/pasid now as part of
the x86 PASID MSR series.

Thanks.

-Fenghua
Jean-Philippe Brucker Sept. 30, 2020, 9:13 a.m. UTC | #3 
On Mon, Sep 28, 2020 at 10:43:26PM +0000, Fenghua Yu wrote:
> Hi, Will and Jean,
> 
> On Mon, Sep 28, 2020 at 11:22:51PM +0100, Will Deacon wrote:
> > On Fri, Sep 18, 2020 at 12:18:41PM +0200, Jean-Philippe Brucker wrote:
> > > From: Fenghua Yu <fenghua.yu@intel.com>
> > > 
> > > 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@infradead.org>
> > > Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
> > > Reviewed-by: Tony Luck <tony.luck@intel.com>
> > > ---
> > > https://lore.kernel.org/linux-iommu/1600187413-163670-8-git-send-email-fenghua.yu@intel.com/
> > > ---
> > >  include/linux/mm_types.h | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > 
> > Acked-by: Will Deacon <will@kernel.org>
> 
> FYI. This patch is in x86 maintainers tree tip:x86/pasid now as part of
> the x86 PASID MSR series.

Ah I missed that, glad to see it in v5.10

Thanks,
Jean
diff mbox series

Patch

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;
 
 	/*