From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Peter Zijlstra" <peterz@infradead.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Tony Luck" <tony.luck@intel.com>,
"Lu Baolu" <baolu.lu@linux.intel.com>,
"Joerg Roedel" <joro@8bytes.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
"Jacob Pan" <jacob.jun.pan@linux.intel.com>,
"Ashok Raj" <ashok.raj@intel.com>,
"Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: iommu@lists.linux-foundation.org, "x86" <x86@kernel.org>,
"linux-kernel" <linux-kernel@vger.kernel.org>,
Fenghua Yu <fenghua.yu@intel.com>
Subject: [PATCH v4 00/11] Re-enable ENQCMD and PASID MSR
Date: Mon, 7 Feb 2022 15:02:43 -0800 [thread overview]
Message-ID: <20220207230254.3342514-1-fenghua.yu@intel.com> (raw)
Problems in the old code to manage SVM (Shared Virtual Memory) devices
and the PASID (Process Address Space ID) led to that code being
disabled.
Subsequent discussions resulted in a far simpler approach:
1) PASID life cycle is from first allocation by a process until that
process exits.
2) All tasks begin with PASID disabled
3) The #GP fault handler tries to fix faulting ENQCMD instructions very
early (thus avoiding complexities of the XSAVE infrastructure)
Change Log:
v4:
- Update commit message in patch #4 (Thomas).
- Update commit message in patch #5 (Thomas).
- Add "Reviewed-by: Thomas Gleixner <tglx@linutronix.de>" in patch #1-#3
and patch #6-#9 (Thomas).
- Rebased to 5.17-rc3.
v3 can be found at https://lore.kernel.org/lkml/20220128202905.2274672-7-fenghua.yu@intel.com/T/#m039e1a201e9894d99b117fa6005bc05724a5a4bb
v3:
- Rename mm_pasid_get() to mm_pasid_set() in patch #5 (Thomas).
- Remove ioasid_get() because it's not used any more when the IOASID
is freed on mm exit in patch #5 (Thomas).
- Remove PASID's refcount exercise in ioasid_put() and rename
ioasid_put() to ioasid_free() in patch #5 and #11 (Thomas).
- Add Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> in patch #10.
v2 can be found at https://lore.kernel.org/lkml/20211217220136.2762116-1-fenghua.yu@intel.com/
v2:
- Free PASID on mm exit instead of in exit(2) or unbind() (Thomas, AndyL,
PeterZ)
- Directly write IA32_PASID MSR in fixup while local IRQ is still disabled
(Thomas)
- Simplify handling ENQCMD in objtool (PeterZ and Josh)
- Define mm_pasid_get(), mm_pasid_drop(), and mm_pasid_init() in mm and
call the functions from IOMMU (Dave Hansen).
- A few changes in the #GP fixup function (Dave Hansen, Tony Luck).
- Initial PASID value is changed to INVALID_PASID (Ashok Raj and
Jacob Pan).
- Add mm_pasid_init(), mm_pasid_get(), and mm_pasid_drop() functions in mm.
So the mm's PASID operations are generic for both X86 and ARM
(Dave Hansen).
- Rename CONFIG_IOMMU_SVA_LIB to more useful and accurate
CONFIG_IOMMU_SVA
- Use CONFIG_IOMMU_SVA for PASID processing condition (Jacob)
- The patch that cleans up old update_pasid() function is in upstream
now (commit: 00ecd5401349 "iommu/vt-d: Clean up unused PASID updating
functions") and therefore it's removed from this version.
v1 can be found at https://lore.kernel.org/lkml/20210920192349.2602141-1-fenghua.yu@intel.com/T/#md6d542091da1d1159eda0a44a16e57d0c0dfb209
Fenghua Yu (10):
iommu/sva: Rename CONFIG_IOMMU_SVA_LIB to CONFIG_IOMMU_SVA
mm: Change CONFIG option for mm->pasid field
iommu/ioasid: Introduce a helper to check for valid PASIDs
kernel/fork: Initialize mm's PASID
iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm
exit
x86/fpu: Clear PASID when copying fpstate
x86/traps: Demand-populate PASID MSR via #GP
x86/cpufeatures: Re-enable ENQCMD
tools/objtool: Check for use of the ENQCMD instruction in the kernel
docs: x86: Change documentation for SVA (Shared Virtual Addressing)
Peter Zijlstra (1):
sched: Define and initialize a flag to identify valid PASID in the
task
Documentation/x86/sva.rst | 53 ++++++++++++++----
arch/x86/include/asm/disabled-features.h | 7 ++-
arch/x86/kernel/fpu/core.c | 7 +++
arch/x86/kernel/traps.c | 55 +++++++++++++++++++
drivers/iommu/Kconfig | 6 +-
drivers/iommu/Makefile | 2 +-
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 5 +-
drivers/iommu/intel/Kconfig | 2 +-
drivers/iommu/intel/iommu.c | 4 +-
drivers/iommu/intel/svm.c | 9 ---
drivers/iommu/ioasid.c | 39 ++-----------
drivers/iommu/iommu-sva-lib.c | 39 ++++---------
drivers/iommu/iommu-sva-lib.h | 7 +--
include/linux/ioasid.h | 21 +++----
include/linux/mm_types.h | 2 +-
include/linux/sched.h | 3 +
include/linux/sched/mm.h | 26 +++++++++
kernel/fork.c | 15 +++--
mm/init-mm.c | 4 ++
tools/objtool/arch/x86/decode.c | 11 +++-
20 files changed, 197 insertions(+), 120 deletions(-)
--
2.35.1
next reply other threads:[~2022-02-08 1:05 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-07 23:02 Fenghua Yu [this message]
2022-02-07 23:02 ` [PATCH v4 01/11] iommu/sva: Rename CONFIG_IOMMU_SVA_LIB to CONFIG_IOMMU_SVA Fenghua Yu
2022-02-08 2:39 ` Lu Baolu
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 02/11] mm: Change CONFIG option for mm->pasid field Fenghua Yu
2022-02-08 2:40 ` Lu Baolu
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 03/11] iommu/ioasid: Introduce a helper to check for valid PASIDs Fenghua Yu
2022-02-08 2:40 ` Lu Baolu
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 04/11] kernel/fork: Initialize mm's PASID Fenghua Yu
2022-02-14 17:23 ` Thomas Gleixner
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit Fenghua Yu
2022-02-08 2:41 ` Lu Baolu
2022-02-08 15:01 ` Fenghua Yu
2022-02-10 3:16 ` Jacob Pan
2022-02-10 16:27 ` Fenghua Yu
2022-02-10 17:24 ` Luck, Tony
2022-02-10 18:31 ` Fenghua Yu
2022-02-10 23:52 ` Fenghua Yu
2022-02-10 18:49 ` Jacob Pan
2022-02-10 23:15 ` Fenghua Yu
2022-02-11 22:00 ` Dave Hansen
2022-02-14 17:24 ` Thomas Gleixner
2022-02-15 9:55 ` Joerg Roedel
[not found] ` <tencent_F6830A1196DB4C6A904D7C691F0D961D1108@qq.com>
2022-04-11 14:10 ` Dave Hansen
2022-04-11 14:20 ` zhangfei.gao
2022-04-11 14:36 ` Dave Hansen
2022-04-11 14:44 ` zhangfei.gao
2022-04-11 14:52 ` Dave Hansen
2022-04-11 15:13 ` zhangfei.gao
2022-04-12 7:04 ` zhangfei.gao
2022-04-12 13:41 ` Fenghua Yu
2022-04-12 14:39 ` Dave Hansen
2022-04-15 9:59 ` Fenghua Yu
2022-04-12 15:35 ` zhangfei.gao
2022-04-14 10:08 ` zhangfei.gao
2022-04-15 9:51 ` Fenghua Yu
[not found] ` <99bcb9f5-4776-9c40-a776-cdecfa9e1010@foxmail.com>
2022-04-15 10:14 ` zhangfei.gao
2022-04-15 10:50 ` Fenghua Yu
2022-04-15 11:52 ` zhangfei.gao
2022-04-15 12:37 ` Fenghua Yu
2022-04-16 1:30 ` zhangfei.gao
2022-04-15 19:07 ` Fenghua Yu
2022-04-15 21:00 ` Jacob Pan
2022-04-16 1:43 ` zhangfei.gao
2022-04-18 18:14 ` Jacob Pan
2022-04-19 1:02 ` zhangfei.gao
2022-04-18 6:34 ` Tian, Kevin
2022-04-18 18:11 ` Jacob Pan
2022-04-20 16:45 ` Jean-Philippe Brucker
2022-04-21 6:47 ` zhangfei.gao
2022-04-22 9:03 ` zhangfei.gao
2022-04-22 10:11 ` Jean-Philippe Brucker
2022-04-22 13:15 ` zhangfei.gao
2022-04-22 15:50 ` Jean-Philippe Brucker
2022-04-23 11:13 ` zhangfei.gao
2022-04-24 2:58 ` Zhangfei Gao
2022-04-24 9:52 ` Zhangfei Gao
2022-04-25 13:53 ` Jean-Philippe Brucker
2022-04-25 14:18 ` Dave Hansen
2022-04-25 14:26 ` Jean-Philippe Brucker
2022-04-25 15:34 ` Jacob Pan
2022-04-25 16:13 ` Jean-Philippe Brucker
2022-04-25 22:32 ` Jacob Pan
2022-04-26 4:20 ` Fenghua Yu
2022-04-26 5:04 ` Zhangfei Gao
2022-04-28 0:54 ` Fenghua Yu
2022-04-28 8:43 ` Jean-Philippe Brucker
2022-04-28 15:09 ` Dave Hansen
2022-04-28 15:28 ` Fenghua Yu
2022-04-28 15:42 ` Dave Hansen
2022-04-28 16:01 ` Jean-Philippe Brucker
2022-04-28 16:35 ` Dave Hansen
2022-04-26 4:28 ` Zhangfei Gao
2022-04-26 4:36 ` Fenghua Yu
2022-04-26 5:19 ` Zhangfei Gao
2022-04-25 15:55 ` Dave Hansen
2022-04-25 16:40 ` Jean-Philippe Brucker
2022-04-26 15:27 ` Dave Hansen
2022-04-26 16:48 ` Jean-Philippe Brucker
2022-04-26 23:31 ` Dave Hansen
2022-04-28 8:39 ` Jean-Philippe Brucker
2022-04-29 7:53 ` Baolu Lu
2022-04-29 13:51 ` Fenghua Yu
2022-04-29 14:34 ` Jean-Philippe Brucker
2022-04-29 22:19 ` Fenghua Yu
2022-04-30 7:33 ` Baolu Lu
2022-05-03 7:49 ` Jean-Philippe Brucker
2022-05-06 5:36 ` Baolu Lu
2022-04-12 14:36 ` Dave Hansen
2022-04-12 15:10 ` Jean-Philippe Brucker
2022-04-12 15:35 ` Dave Hansen
2022-04-13 11:14 ` Lu Baolu
2022-04-25 2:57 ` zhangfei.gao
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 06/11] x86/fpu: Clear PASID when copying fpstate Fenghua Yu
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 07/11] sched: Define and initialize a flag to identify valid PASID in the task Fenghua Yu
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Peter Zijlstra
2022-02-07 23:02 ` [PATCH v4 08/11] x86/traps: Demand-populate PASID MSR via #GP Fenghua Yu
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 09/11] x86/cpufeatures: Re-enable ENQCMD Fenghua Yu
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 10/11] tools/objtool: Check for use of the ENQCMD instruction in the kernel Fenghua Yu
2022-02-15 10:54 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu
2022-03-09 7:55 ` [tip: x86/core] " tip-bot2 for Fenghua Yu
2022-03-15 10:44 ` tip-bot2 for Fenghua Yu
2022-02-07 23:02 ` [PATCH v4 11/11] docs: x86: Change documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2022-02-14 17:25 ` Thomas Gleixner
2022-02-15 10:54 ` [tip: x86/pasid] Documentation/x86: Update " tip-bot2 for Fenghua Yu
2022-02-11 20:04 ` [PATCH v4 00/11] Re-enable ENQCMD and PASID MSR Fenghua Yu
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