From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Peter Zijlstra" <peterz@infradead.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"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 v2 00/11] Re-enable ENQCMD and PASID MSR
Date: Fri, 17 Dec 2021 22:01:25 +0000 [thread overview]
Message-ID: <20211217220136.2762116-1-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:
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 | 58 +++++++++++++++----
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/svm.c | 9 ---
drivers/iommu/iommu-sva-lib.c | 39 ++++---------
drivers/iommu/iommu-sva-lib.h | 7 +--
include/linux/ioasid.h | 9 +++
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 +++-
18 files changed, 194 insertions(+), 73 deletions(-)
--
2.34.1
next reply other threads:[~2021-12-17 22:01 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-17 22:01 Fenghua Yu [this message]
2021-12-17 22:01 ` [PATCH v2 01/11] iommu/sva: Rename CONFIG_IOMMU_SVA_LIB to CONFIG_IOMMU_SVA Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 02/11] mm: Change CONFIG option for mm->pasid field Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 03/11] iommu/ioasid: Introduce a helper to check for valid PASIDs Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 04/11] kernel/fork: Initialize mm's PASID Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 05/11] iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit Fenghua Yu
2022-01-24 20:21 ` Thomas Gleixner
2022-01-24 20:33 ` Fenghua Yu
2022-01-24 20:36 ` Thomas Gleixner
2022-01-24 20:52 ` Fenghua Yu
2022-01-24 20:55 ` Thomas Gleixner
2022-01-25 15:18 ` Fenghua Yu
2022-01-26 14:23 ` Thomas Gleixner
2022-01-26 17:36 ` Fenghua Yu
2022-01-26 21:38 ` Thomas Gleixner
2022-01-28 2:42 ` Fenghua Yu
2022-01-28 14:53 ` Thomas Gleixner
2021-12-17 22:01 ` [PATCH v2 06/11] x86/fpu: Clear PASID when copying fpstate Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 07/11] sched: Define and initialize a flag to identify valid PASID in the task Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 08/11] x86/traps: Demand-populate PASID MSR via #GP Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 09/11] x86/cpufeatures: Re-enable ENQCMD Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 10/11] tools/objtool: Check for use of the ENQCMD instruction in the kernel Fenghua Yu
2021-12-17 22:57 ` Josh Poimboeuf
2021-12-27 17:50 ` Fenghua Yu
2021-12-17 22:01 ` [PATCH v2 11/11] docs: x86: Change documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2021-12-27 17:52 ` [PATCH v2 00/11] Re-enable ENQCMD and PASID MSR Fenghua Yu
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