Messages in this thread Patch in this message |  | | Date | Tue, 15 Feb 2022 10:54:28 -0000 | From | "tip-bot2 for Peter Zijlstra" <> | Subject | [tip: x86/pasid] sched: Define and initialize a flag to identify valid PASID in the task |
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The following commit has been merged into the x86/pasid branch of tip:
Commit-ID: a3d29e8291b622780eb6e4e3eeaf2b24ec78fd43 Gitweb: https://git.kernel.org/tip/a3d29e8291b622780eb6e4e3eeaf2b24ec78fd43 Author: Peter Zijlstra <peterz@infradead.org> AuthorDate: Mon, 07 Feb 2022 15:02:50 -08:00 Committer: Borislav Petkov <bp@suse.de> CommitterDate: Tue, 15 Feb 2022 11:31:43 +01:00
sched: Define and initialize a flag to identify valid PASID in the task
Add a new single bit field to the task structure to track whether this task has initialized the IA32_PASID MSR to the mm's PASID.
Initialize the field to zero when creating a new task with fork/clone.
Signed-off-by: Peter Zijlstra <peterz@infradead.org> Co-developed-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20220207230254.3342514-8-fenghua.yu@intel.com --- include/linux/sched.h | 3 +++ kernel/fork.c | 4 ++++ 2 files changed, 7 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h index 75ba8aa..4e5de3a 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -938,6 +938,9 @@ struct task_struct { /* Recursion prevention for eventfd_signal() */ unsigned in_eventfd_signal:1; #endif +#ifdef CONFIG_IOMMU_SVA + unsigned pasid_activated:1; +#endif unsigned long atomic_flags; /* Flags requiring atomic access. */ diff --git a/kernel/fork.c b/kernel/fork.c index c03c668..51fd1df 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -968,6 +968,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node) tsk->use_memdelay = 0; #endif +#ifdef CONFIG_IOMMU_SVA + tsk->pasid_activated = 0; +#endif + #ifdef CONFIG_MEMCG tsk->active_memcg = NULL; #endif
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