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[PATCH v9 0/5] Share sva domains with all devices bound to a mm

Tina Zhang posted 5 patches 2 years, 2 months ago
There is a newer version of this series
arch/x86/kernel/traps.c                       |  2 +-
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 14 +--
drivers/iommu/intel/svm.c                     | 14 +--
drivers/iommu/iommu-sva.c                     | 94 +++++++++++--------
include/linux/iommu.h                         | 38 +++++++-
include/linux/mm_types.h                      |  3 +-
mm/init-mm.c                                  |  3 -
7 files changed, 108 insertions(+), 60 deletions(-)
[PATCH v9 0/5] Share sva domains with all devices bound to a mm
Posted by Tina Zhang 2 years, 2 months ago 
This series is to share sva(shared virtual addressing) domains with all
devices bound to one mm.

Problem
-------
In the current iommu core code, sva domain is allocated per IOMMU group,
when device driver is binding a process address space to a device (which is
handled in iommu_sva_bind_device()). If one than more device is bound to
the same process address space, there must be more than one sva domain
instance, with each device having one. In other words, the sva domain
doesn't share between those devices bound to the same process address
space, and that leads to two problems:
1) device driver has to duplicate sva domains with enqcmd, as those sva
domains have the same PASID and are relevant to one virtual address space.
This makes the sva domain handling complex in device drivers.
2) IOMMU driver cannot get sufficient info of the IOMMUs that have
devices behind them bound to the same virtual address space, when handling
mmu_notifier_ops callbacks. As a result, IOMMU IOTLB invalidation is
performed per device instead of per IOMMU, and that may lead to
superfluous IOTLB invalidation issue, especially in a virtualization
environment where all devices may be behind one virtual IOMMU.

Solution
--------
This patch-set tries to fix those two problems by allowing sharing sva
domains with all devices bound to a mm. To achieve this, a new structure
pointer is introduced to mm to replace the old PASID field, which can keep
the info of PASID as well as the corresponding shared sva domains.
Besides, function iommu_sva_bind_device() is updated to ensure a new sva
domain can only be allocated when the old ones cannot work for the IOMMU.
With these changes, a device driver can expect one sva domain could work
for per PASID instance(e.g., enqcmd PASID instance), and therefore may get
rid of handling sva domain duplication. Besides, IOMMU driver (e.g., intel
vt-d driver) can get sufficient info (e.g., the info of the IOMMUs having
their devices bound to one virtual address space) when handling
mmu_notifier_ops callbacks, to remove the redundant IOTLB invalidations.

Arguably there shouldn't be more than one sva_domain with the same PASID,
and in any sane configuration there should be only 1 type of IOMMU driver
that needs only 1 SVA domain. However, in reality, IOMMUs on one platform
may not be identical to each other. Thus, attaching a sva domain that has
been successfully bound to device A behind a IOMMU A, to device B behind
IOMMU B may get failed due to the difference between IOMMU A and IOMMU
B. In this case, a new sva domain with the same PASID needs to be
allocated to work with IOMMU B. That's why we need a list to keep sva
domains of one PASID. For the platform where IOMMUs are compatible to each
other, there should be one sva domain in the list.

v8:
 - CC more people
 - CC iommu@lists.linux.dev mailing list.
   When sending version 7, some issue happened in my CC list and that caused
   version 7 wasn't sent to iommu@lists.linux.dev.
 - Rebase to v6.6-rc6 and make a few format changes.

v7: https://lore.kernel.org/lkml/20231012030112.82270-1-tina.zhang@intel.com/
 - Add mm_pasid_init() back and do zeroing mm->iommu_mm pointer in
   mm_pasid_init() to avoid the use-after-free/double-free problem.
 - Update the commit message of patch "iommu: Add mm_get_enqcmd_pasid()
   helper function".

v6: https://lore.kernel.org/linux-iommu/20231011065132.102676-1-tina.zhang@intel.com/
 - Rename iommu_sva_alloc_pasid() to iommu_alloc_mm_data().
 - Hold the iommu_sva_lock before invoking iommu_alloc_mm_data().
 - Remove "iommu: Introduce mm_get_pasid() helper function" patch, because
   SMMUv3 decides to use mm_get_enqcmd_pasid() instead and other users are
   using iommu_sva_get_pasid() to get the pasid value. Besides, the iommu
   core accesses iommu_mm_data in the critical section protected by
   iommu_sva_lock. So no need to add another helper to retrieve PASID
   atomically.

v5: https://lore.kernel.org/linux-iommu/20230925023813.575016-1-tina.zhang@intel.com/
 - Order patch "iommu/vt-d: Remove mm->pasid in intel_sva_bind_mm()"
   first in this series.
 - Update commit message of patch "iommu: Introduce mm_get_pasid()
   helper function"
 - Use smp_store_release() & READ_ONCE() in storing and loading mm's
   pasid value.

v4: https://lore.kernel.org/linux-iommu/20230912125936.722348-1-tina.zhang@intel.com/
 - Rebase to v6.6-rc1.

v3: https://lore.kernel.org/linux-iommu/20230905000930.24515-1-tina.zhang@intel.com/
 - Add a comment describing domain->next.
 - Expand explanation of why PASID isn't released in
   iommu_sva_unbind_device().
 - Add a patch to remove mm->pasid in intel_sva_bind_mm()

v2: https://lore.kernel.org/linux-iommu/20230827084401.819852-1-tina.zhang@intel.com/
 - Add mm_get_enqcmd_pasid().
 - Update commit message.

v1: https://lore.kernel.org/linux-iommu/20230808074944.7825-1-tina.zhang@intel.com/

RFC: https://lore.kernel.org/linux-iommu/20230707013441.365583-1-tina.zhang@intel.com/

Tina Zhang (5):
  iommu/vt-d: Remove mm->pasid in intel_sva_bind_mm()
  iommu: Add mm_get_enqcmd_pasid() helper function
  mm: Add structure to keep sva information
  iommu: Support mm PASID 1:n with sva domains
  mm: Deprecate pasid field

 arch/x86/kernel/traps.c                       |  2 +-
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 14 +--
 drivers/iommu/intel/svm.c                     | 14 +--
 drivers/iommu/iommu-sva.c                     | 94 +++++++++++--------
 include/linux/iommu.h                         | 38 +++++++-
 include/linux/mm_types.h                      |  3 +-
 mm/init-mm.c                                  |  3 -
 7 files changed, 108 insertions(+), 60 deletions(-)

-- 
2.39.3
Re: [PATCH v9 0/5] Share sva domains with all devices bound to a mm
Posted by Jason Gunthorpe 2 years, 2 months ago 
On Wed, Oct 18, 2023 at 01:06:35PM +0800, Tina Zhang wrote:

> Tina Zhang (5):
>   iommu/vt-d: Remove mm->pasid in intel_sva_bind_mm()
>   iommu: Add mm_get_enqcmd_pasid() helper function
>   mm: Add structure to keep sva information
>   iommu: Support mm PASID 1:n with sva domains
>   mm: Deprecate pasid field

I don't know where Joerg has gone, he hasn't been able to answer three
emails about this series in the last week. I'll take it through the
iommufd tree so we can have an orderly next cycle for the three driver
series already posted. If it reaches Joerg's tree before Sunday I'll
drop it.

We should have a discussion about process at LPC.

Regards,
Jason
Re: [PATCH v9 0/5] Share sva domains with all devices bound to a mm
Posted by Joerg Roedel 2 years, 2 months ago 
Hi Tina,

On Wed, Oct 18, 2023 at 01:06:35PM +0800, Tina Zhang wrote:
> Tina Zhang (5):
>   iommu/vt-d: Remove mm->pasid in intel_sva_bind_mm()
>   iommu: Add mm_get_enqcmd_pasid() helper function
>   mm: Add structure to keep sva information
>   iommu: Support mm PASID 1:n with sva domains
>   mm: Deprecate pasid field

Thanks for doing this, it all looks reasonable to me. But there is one
thing missing which needs to be done before we can move forward with
this.

There was a discussion about the Kconfig symbol naming used in
mm_struct. Please see the discussion here:

	https://lore.kernel.org/all/CAHk-=wgUiAtiszwseM1p2fCJ+sC4XWQ+YN4TanFhUgvUqjr9Xw@mail.gmail.com/

Please update this patch-set to solve this and I will take the series.

Regards,

	Joerg
Re: [PATCH v9 0/5] Share sva domains with all devices bound to a mm
Posted by Jason Gunthorpe 2 years, 2 months ago 
On Thu, Oct 26, 2023 at 09:24:40AM +0200, Joerg Roedel wrote:
> Hi Tina,
> 
> On Wed, Oct 18, 2023 at 01:06:35PM +0800, Tina Zhang wrote:
> > Tina Zhang (5):
> >   iommu/vt-d: Remove mm->pasid in intel_sva_bind_mm()
> >   iommu: Add mm_get_enqcmd_pasid() helper function
> >   mm: Add structure to keep sva information
> >   iommu: Support mm PASID 1:n with sva domains
> >   mm: Deprecate pasid field
> 
> Thanks for doing this, it all looks reasonable to me. But there is one
> thing missing which needs to be done before we can move forward with
> this.
> 
> There was a discussion about the Kconfig symbol naming used in
> mm_struct. Please see the discussion here:
> 
> 	https://lore.kernel.org/all/CAHk-=wgUiAtiszwseM1p2fCJ+sC4XWQ+YN4TanFhUgvUqjr9Xw@mail.gmail.com/
>
> Please update this patch-set to solve this and I will take the series.

Lets call it CONFIG_IOMMU_MM_DATA then. It is still pretty nonsensical
but it speaks to what it does after this series

Thanks,
Jason
Re: [PATCH v9 0/5] Share sva domains with all devices bound to a mm
Posted by Jason Gunthorpe 2 years, 2 months ago 
On Thu, Oct 26, 2023 at 09:20:16AM -0300, Jason Gunthorpe wrote:
> On Thu, Oct 26, 2023 at 09:24:40AM +0200, Joerg Roedel wrote:
> > Hi Tina,
> > 
> > On Wed, Oct 18, 2023 at 01:06:35PM +0800, Tina Zhang wrote:
> > > Tina Zhang (5):
> > >   iommu/vt-d: Remove mm->pasid in intel_sva_bind_mm()
> > >   iommu: Add mm_get_enqcmd_pasid() helper function
> > >   mm: Add structure to keep sva information
> > >   iommu: Support mm PASID 1:n with sva domains
> > >   mm: Deprecate pasid field
> > 
> > Thanks for doing this, it all looks reasonable to me. But there is one
> > thing missing which needs to be done before we can move forward with
> > this.
> > 
> > There was a discussion about the Kconfig symbol naming used in
> > mm_struct. Please see the discussion here:
> > 
> > 	https://lore.kernel.org/all/CAHk-=wgUiAtiszwseM1p2fCJ+sC4XWQ+YN4TanFhUgvUqjr9Xw@mail.gmail.com/
> >
> > Please update this patch-set to solve this and I will take the series.
> 
> Lets call it CONFIG_IOMMU_MM_DATA then. It is still pretty nonsensical
> but it speaks to what it does after this series

This is what I came up with:

From ca97b6cb94eadc4066d762aa4c54e7ba9789f3f4 Mon Sep 17 00:00:00 2001
From: Jason Gunthorpe <jgg@nvidia.com>
Date: Thu, 26 Oct 2023 10:43:12 -0300
Subject: [PATCH] iommu: Change kconfig around IOMMU_SVA

Linus suggested that the kconfig here is confusing:

https://lore.kernel.org/all/CAHk-=wgUiAtiszwseM1p2fCJ+sC4XWQ+YN4TanFhUgvUqjr9Xw@mail.gmail.com/

Let's break it into three kconfigs controlling distinct things:

 - CONFIG_IOMMU_MM_DATA controls if the mm_struct has the additional
   fields for the IOMMU. Currently only PASID, but later patches store
   a struct iommu_mm_data *

 - CONFIG_ARCH_HAS_CPU_PASID controls if the arch needs the scheduling bit
   for keeping track of the ENQCMD instruction. x86 will select this if
   IOMMU_SVA is enabled

 - IOMMU_SVA controls if the IOMMU core compiles in the SVA support code
   for iommu driver use and the IOMMU exported API

This way ARM will not enable CONFIG_ARCH_HAS_CPU_PASID

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 arch/Kconfig             | 5 +++++
 arch/x86/Kconfig         | 1 +
 arch/x86/kernel/traps.c  | 2 +-
 drivers/iommu/Kconfig    | 1 +
 include/linux/iommu.h    | 2 +-
 include/linux/mm_types.h | 2 +-
 include/linux/sched.h    | 2 +-
 kernel/fork.c            | 2 +-
 mm/Kconfig               | 3 +++
 mm/init-mm.c             | 2 +-
 10 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 12d51495caec18..35b9fd559bb697 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -301,6 +301,11 @@ config ARCH_HAS_DMA_CLEAR_UNCACHED
 config ARCH_HAS_CPU_FINALIZE_INIT
 	bool
 
+# The architecture has a per-task state that includes the mm's PASID
+config ARCH_HAS_CPU_PASID
+	bool
+	select IOMMU_MM_DATA
+
 # Select if arch init_task must go in the __init_task_data section
 config ARCH_TASK_STRUCT_ON_STACK
 	bool
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 66bfabae881491..afd9c2dc228bdf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -72,6 +72,7 @@ config X86
 	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
 	select ARCH_HAS_CPU_FINALIZE_INIT
+	select ARCH_HAS_CPU_PASID		if IOMMU_SVA
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DEBUG_VIRTUAL
 	select ARCH_HAS_DEBUG_VM_PGTABLE	if !X86_PAE
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index c876f1d36a81a7..2b62dbb3396add 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -565,7 +565,7 @@ static bool fixup_iopl_exception(struct pt_regs *regs)
  */
 static bool try_fixup_enqcmd_gp(void)
 {
-#ifdef CONFIG_IOMMU_SVA
+#ifdef CONFIG_ARCH_HAS_CPU_PASID
 	u32 pasid;
 
 	/*
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 5cc869db1b79fc..0f9c3f6ae8d32d 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -160,6 +160,7 @@ config IOMMU_DMA
 
 # Shared Virtual Addressing
 config IOMMU_SVA
+	select IOMMU_MM_DATA
 	bool
 
 config FSL_PAMU
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 8fb1b41b4d1580..0d2e01404c3e50 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -1324,7 +1324,7 @@ static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream
 	return false;
 }
 
-#ifdef CONFIG_IOMMU_SVA
+#ifdef CONFIG_IOMMU_MM_DATA
 static inline void mm_pasid_init(struct mm_struct *mm)
 {
 	mm->pasid = IOMMU_PASID_INVALID;
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 36c5b43999e608..330f3cd8d5ad97 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -881,7 +881,7 @@ struct mm_struct {
 #endif
 		struct work_struct async_put_work;
 
-#ifdef CONFIG_IOMMU_SVA
+#ifdef CONFIG_IOMMU_MM_DATA
 		u32 pasid;
 #endif
 #ifdef CONFIG_KSM
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 77f01ac385f7a5..3ac8e8556c3d93 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -949,7 +949,7 @@ struct task_struct {
 	/* Recursion prevention for eventfd_signal() */
 	unsigned			in_eventfd:1;
 #endif
-#ifdef CONFIG_IOMMU_SVA
+#ifdef CONFIG_ARCH_HAS_CPU_PASID
 	unsigned			pasid_activated:1;
 #endif
 #ifdef	CONFIG_CPU_SUP_INTEL
diff --git a/kernel/fork.c b/kernel/fork.c
index 3b6d20dfb9a85e..d28f0d4582dcc1 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1179,7 +1179,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
 	tsk->use_memdelay = 0;
 #endif
 
-#ifdef CONFIG_IOMMU_SVA
+#ifdef CONFIG_ARCH_HAS_CPU_PASID
 	tsk->pasid_activated = 0;
 #endif
 
diff --git a/mm/Kconfig b/mm/Kconfig
index 264a2df5ecf5b9..fee4a15e444b74 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1258,6 +1258,9 @@ config LOCK_MM_AND_FIND_VMA
 	bool
 	depends on !STACK_GROWSUP
 
+config IOMMU_MM_DATA
+	bool
+
 source "mm/damon/Kconfig"
 
 endmenu
diff --git a/mm/init-mm.c b/mm/init-mm.c
index cfd367822cdd2e..c52dc2740a3de2 100644
--- a/mm/init-mm.c
+++ b/mm/init-mm.c
@@ -44,7 +44,7 @@ struct mm_struct init_mm = {
 #endif
 	.user_ns	= &init_user_ns,
 	.cpu_bitmap	= CPU_BITS_NONE,
-#ifdef CONFIG_IOMMU_SVA
+#ifdef CONFIG_IOMMU_MM_DATA
 	.pasid		= IOMMU_PASID_INVALID,
 #endif
 	INIT_MM_CONTEXT(init_mm)
-- 
2.42.0
RE: [PATCH v9 0/5] Share sva domains with all devices bound to a mm
Posted by Zhang, Tina 2 years, 2 months ago 
Hi Jason and Joerg,

Thanks for this commit. Version 10 of this patch-set has been submitted and this patch is added.

Regards,
-Tina

> -----Original Message-----
> From: Jason Gunthorpe <jgg@ziepe.ca>
> Sent: Thursday, October 26, 2023 9:51 PM
> To: Joerg Roedel <joro@8bytes.org>
> Cc: Zhang, Tina <tina.zhang@intel.com>; iommu@lists.linux.dev; linux-
> kernel@vger.kernel.org; David Woodhouse <dwmw2@infradead.org>; Lu Baolu
> <baolu.lu@linux.intel.com>; Will Deacon <will@kernel.org>; Robin Murphy
> <robin.murphy@arm.com>; Tian, Kevin <kevin.tian@intel.com>; Nicolin Chen
> <nicolinc@nvidia.com>; Michael Shavit <mshavit@google.com>; Vasant Hegde
> <vasant.hegde@amd.com>
> Subject: Re: [PATCH v9 0/5] Share sva domains with all devices bound to a mm
> 
> On Thu, Oct 26, 2023 at 09:20:16AM -0300, Jason Gunthorpe wrote:
> > On Thu, Oct 26, 2023 at 09:24:40AM +0200, Joerg Roedel wrote:
> > > Hi Tina,
> > >
> > > On Wed, Oct 18, 2023 at 01:06:35PM +0800, Tina Zhang wrote:
> > > > Tina Zhang (5):
> > > >   iommu/vt-d: Remove mm->pasid in intel_sva_bind_mm()
> > > >   iommu: Add mm_get_enqcmd_pasid() helper function
> > > >   mm: Add structure to keep sva information
> > > >   iommu: Support mm PASID 1:n with sva domains
> > > >   mm: Deprecate pasid field
> > >
> > > Thanks for doing this, it all looks reasonable to me. But there is
> > > one thing missing which needs to be done before we can move forward
> > > with this.
> > >
> > > There was a discussion about the Kconfig symbol naming used in
> > > mm_struct. Please see the discussion here:
> > >
> > >
> > > https://lore.kernel.org/all/CAHk-=wgUiAtiszwseM1p2fCJ+sC4XWQ+YN4TanF
> > > hUgvUqjr9Xw@mail.gmail.com/
> > >
> > > Please update this patch-set to solve this and I will take the series.
> >
> > Lets call it CONFIG_IOMMU_MM_DATA then. It is still pretty nonsensical
> > but it speaks to what it does after this series
> 
> This is what I came up with:
> 
> From ca97b6cb94eadc4066d762aa4c54e7ba9789f3f4 Mon Sep 17 00:00:00
> 2001
> From: Jason Gunthorpe <jgg@nvidia.com>
> Date: Thu, 26 Oct 2023 10:43:12 -0300
> Subject: [PATCH] iommu: Change kconfig around IOMMU_SVA
> 
> Linus suggested that the kconfig here is confusing:
> 
> https://lore.kernel.org/all/CAHk-
> =wgUiAtiszwseM1p2fCJ+sC4XWQ+YN4TanFhUgvUqjr9Xw@mail.gmail.com/
> 
> Let's break it into three kconfigs controlling distinct things:
> 
>  - CONFIG_IOMMU_MM_DATA controls if the mm_struct has the additional
>    fields for the IOMMU. Currently only PASID, but later patches store
>    a struct iommu_mm_data *
> 
>  - CONFIG_ARCH_HAS_CPU_PASID controls if the arch needs the scheduling bit
>    for keeping track of the ENQCMD instruction. x86 will select this if
>    IOMMU_SVA is enabled
> 
>  - IOMMU_SVA controls if the IOMMU core compiles in the SVA support code
>    for iommu driver use and the IOMMU exported API
> 
> This way ARM will not enable CONFIG_ARCH_HAS_CPU_PASID
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>  arch/Kconfig             | 5 +++++
>  arch/x86/Kconfig         | 1 +
>  arch/x86/kernel/traps.c  | 2 +-
>  drivers/iommu/Kconfig    | 1 +
>  include/linux/iommu.h    | 2 +-
>  include/linux/mm_types.h | 2 +-
>  include/linux/sched.h    | 2 +-
>  kernel/fork.c            | 2 +-
>  mm/Kconfig               | 3 +++
>  mm/init-mm.c             | 2 +-
>  10 files changed, 16 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/Kconfig b/arch/Kconfig index
> 12d51495caec18..35b9fd559bb697 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -301,6 +301,11 @@ config ARCH_HAS_DMA_CLEAR_UNCACHED  config
> ARCH_HAS_CPU_FINALIZE_INIT
>  	bool
> 
> +# The architecture has a per-task state that includes the mm's PASID
> +config ARCH_HAS_CPU_PASID
> +	bool
> +	select IOMMU_MM_DATA
> +
>  # Select if arch init_task must go in the __init_task_data section  config
> ARCH_TASK_STRUCT_ON_STACK
>  	bool
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index
> 66bfabae881491..afd9c2dc228bdf 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -72,6 +72,7 @@ config X86
>  	select ARCH_HAS_CACHE_LINE_SIZE
>  	select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
>  	select ARCH_HAS_CPU_FINALIZE_INIT
> +	select ARCH_HAS_CPU_PASID		if IOMMU_SVA
>  	select ARCH_HAS_CURRENT_STACK_POINTER
>  	select ARCH_HAS_DEBUG_VIRTUAL
>  	select ARCH_HAS_DEBUG_VM_PGTABLE	if !X86_PAE
> diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index
> c876f1d36a81a7..2b62dbb3396add 100644
> --- a/arch/x86/kernel/traps.c
> +++ b/arch/x86/kernel/traps.c
> @@ -565,7 +565,7 @@ static bool fixup_iopl_exception(struct pt_regs *regs)
>   */
>  static bool try_fixup_enqcmd_gp(void)
>  {
> -#ifdef CONFIG_IOMMU_SVA
> +#ifdef CONFIG_ARCH_HAS_CPU_PASID
>  	u32 pasid;
> 
>  	/*
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index
> 5cc869db1b79fc..0f9c3f6ae8d32d 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -160,6 +160,7 @@ config IOMMU_DMA
> 
>  # Shared Virtual Addressing
>  config IOMMU_SVA
> +	select IOMMU_MM_DATA
>  	bool
> 
>  config FSL_PAMU
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h index
> 8fb1b41b4d1580..0d2e01404c3e50 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -1324,7 +1324,7 @@ static inline bool
> tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream
>  	return false;
>  }
> 
> -#ifdef CONFIG_IOMMU_SVA
> +#ifdef CONFIG_IOMMU_MM_DATA
>  static inline void mm_pasid_init(struct mm_struct *mm)  {
>  	mm->pasid = IOMMU_PASID_INVALID;
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index
> 36c5b43999e608..330f3cd8d5ad97 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -881,7 +881,7 @@ struct mm_struct {
>  #endif
>  		struct work_struct async_put_work;
> 
> -#ifdef CONFIG_IOMMU_SVA
> +#ifdef CONFIG_IOMMU_MM_DATA
>  		u32 pasid;
>  #endif
>  #ifdef CONFIG_KSM
> diff --git a/include/linux/sched.h b/include/linux/sched.h index
> 77f01ac385f7a5..3ac8e8556c3d93 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -949,7 +949,7 @@ struct task_struct {
>  	/* Recursion prevention for eventfd_signal() */
>  	unsigned			in_eventfd:1;
>  #endif
> -#ifdef CONFIG_IOMMU_SVA
> +#ifdef CONFIG_ARCH_HAS_CPU_PASID
>  	unsigned			pasid_activated:1;
>  #endif
>  #ifdef	CONFIG_CPU_SUP_INTEL
> diff --git a/kernel/fork.c b/kernel/fork.c index
> 3b6d20dfb9a85e..d28f0d4582dcc1 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -1179,7 +1179,7 @@ static struct task_struct *dup_task_struct(struct
> task_struct *orig, int node)
>  	tsk->use_memdelay = 0;
>  #endif
> 
> -#ifdef CONFIG_IOMMU_SVA
> +#ifdef CONFIG_ARCH_HAS_CPU_PASID
>  	tsk->pasid_activated = 0;
>  #endif
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 264a2df5ecf5b9..fee4a15e444b74 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -1258,6 +1258,9 @@ config LOCK_MM_AND_FIND_VMA
>  	bool
>  	depends on !STACK_GROWSUP
> 
> +config IOMMU_MM_DATA
> +	bool
> +
>  source "mm/damon/Kconfig"
> 
>  endmenu
> diff --git a/mm/init-mm.c b/mm/init-mm.c index
> cfd367822cdd2e..c52dc2740a3de2 100644
> --- a/mm/init-mm.c
> +++ b/mm/init-mm.c
> @@ -44,7 +44,7 @@ struct mm_struct init_mm = {  #endif
>  	.user_ns	= &init_user_ns,
>  	.cpu_bitmap	= CPU_BITS_NONE,
> -#ifdef CONFIG_IOMMU_SVA
> +#ifdef CONFIG_IOMMU_MM_DATA
>  	.pasid		= IOMMU_PASID_INVALID,
>  #endif
>  	INIT_MM_CONTEXT(init_mm)
> --
> 2.42.0

Patchew 2.1-devel-b67e4c2

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