diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2022-02-08 02:02:50 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-02-15 13:31:43 +0300 |
| commit | a3d29e8291b622780eb6e4e3eeaf2b24ec78fd43 (patch) | |
| tree | 3f0f57f936a5e8bfce5debfb0902168cf37c5a5e | |
| parent | dc7507ddce593cbd9c93330024a5658db6f8ef73 (diff) | |
| download | linux-a3d29e8291b622780eb6e4e3eeaf2b24ec78fd43.tar.xz | |
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
| -rw-r--r-- | include/linux/sched.h | 3 | ||||
| -rw-r--r-- | kernel/fork.c | 4 |
2 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 75ba8aa60248..4e5de3aed410 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 c03c6682464c..51fd1df994b7 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 |