From: Fenghua Yu <fenghua.yu@intel.com> To: "Thomas Gleixner" <tglx@linutronix.de>, "Joerg Roedel" <joro@8bytes.org>, "Ingo Molnar" <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>, "Peter Zijlstra" <peterz@infradead.org>, "H Peter Anvin" <hpa@zytor.com>, "David Woodhouse" <dwmw2@infradead.org>, "Lu Baolu" <baolu.lu@linux.intel.com>, "Felix Kuehling" <Felix.Kuehling@amd.com>, "Dave Hansen" <dave.hansen@intel.com>, "Tony Luck" <tony.luck@intel.com>, "Jean-Philippe Brucker" <jean-philippe@linaro.org>, "Christoph Hellwig" <hch@infradead.org>, "Ashok Raj" <ashok.raj@intel.com>, "Jacob Jun Pan" <jacob.jun.pan@intel.com>, "Dave Jiang" <dave.jiang@intel.com>, "Sohil Mehta" <sohil.mehta@intel.com>, "Ravi V Shankar" <ravi.v.shankar@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com>, iommu@lists.linux-foundation.org, x86 <x86@kernel.org>, linux-kernel <linux-kernel@vger.kernel.org>, amd-gfx <amd-gfx@lists.freedesktop.org> Subject: [PATCH v5 08/12] fork: Clear PASID for new mm Date: Tue, 30 Jun 2020 16:44:38 -0700 [thread overview] Message-ID: <1593560682-40814-9-git-send-email-fenghua.yu@intel.com> (raw) In-Reply-To: <1593560682-40814-1-git-send-email-fenghua.yu@intel.com> When a new mm is created, its PASID should be cleared, i.e. the PASID is initialized to its init state 0 on both ARM and X86. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Reviewed-by: Tony Luck <tony.luck@intel.com> --- v2: - Add this patch to initialize PASID value for a new mm. include/linux/mm_types.h | 2 ++ kernel/fork.c | 8 ++++++++ 2 files changed, 10 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index d61285cfe027..d60d2ec10881 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -22,6 +22,8 @@ #endif #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) +/* Initial PASID value is 0. */ +#define INIT_PASID 0 struct address_space; struct mem_cgroup; diff --git a/kernel/fork.c b/kernel/fork.c index 142b23645d82..43b5f112604d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1007,6 +1007,13 @@ static void mm_init_owner(struct mm_struct *mm, struct task_struct *p) #endif } +static void mm_init_pasid(struct mm_struct *mm) +{ +#ifdef CONFIG_IOMMU_SUPPORT + mm->pasid = INIT_PASID; +#endif +} + static void mm_init_uprobes_state(struct mm_struct *mm) { #ifdef CONFIG_UPROBES @@ -1035,6 +1042,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, mm_init_cpumask(mm); mm_init_aio(mm); mm_init_owner(mm, p); + mm_init_pasid(mm); RCU_INIT_POINTER(mm->exe_file, NULL); mmu_notifier_subscriptions_init(mm); init_tlb_flush_pending(mm); -- 2.19.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-06-30 23:45 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-06-30 23:44 [PATCH v5 00/12] x86: tag application address space for devices Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 01/12] iommu: Change type of pasid to u32 Fenghua Yu 2020-07-01 2:12 ` Felix Kuehling 2020-07-02 19:10 ` Fenghua Yu 2020-07-03 5:32 ` Felix Kuehling 2020-06-30 23:44 ` [PATCH v5 02/12] iommu/vt-d: Change flags type to unsigned int in binding mm Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 03/12] docs: x86: Add documentation for SVA (Shared Virtual Addressing) Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 04/12] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 05/12] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 06/12] x86/msr-index: Define IA32_PASID MSR Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 07/12] mm: Define pasid in mm Fenghua Yu 2020-06-30 23:44 ` Fenghua Yu [this message] 2020-06-30 23:44 ` [PATCH v5 09/12] x86/process: Clear PASID state for a newly forked/cloned thread Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 10/12] x86/mmu: Allocate/free PASID Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 11/12] sched: Define and initialize a flag to identify valid PASID in the task Fenghua Yu 2020-06-30 23:44 ` [PATCH v5 12/12] x86/traps: Fix up invalid PASID Fenghua Yu 2020-07-07 21:30 ` [PATCH v5 00/12] x86: tag application address space for devices Fenghua Yu
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