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sched: Define and initialize a flag to identify valid PASID in the task

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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
This commit is contained in:
Peter Zijlstra 2022-02-07 15:02:50 -08:00 committed by Borislav Petkov
parent dc7507ddce
commit a3d29e8291
2 changed files with 7 additions and 0 deletions
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3
include/linux/sched.h
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@ -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. */

4
kernel/fork.c
View File

@ -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