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Message-Id: <20220207230254.3342514-8-fenghua.yu@intel.com>
Date: Mon, 7 Feb 2022 15:02:50 -0800
From: Fenghua Yu <fenghua.yu@...el.com>
To: "Thomas Gleixner" <tglx@...utronix.de>,
"Dave Hansen" <dave.hansen@...ux.intel.com>,
"Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
"Peter Zijlstra" <peterz@...radead.org>,
"Andy Lutomirski" <luto@...nel.org>,
"Tony Luck" <tony.luck@...el.com>,
"Lu Baolu" <baolu.lu@...ux.intel.com>,
"Joerg Roedel" <joro@...tes.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
"Jacob Pan" <jacob.jun.pan@...ux.intel.com>,
"Ashok Raj" <ashok.raj@...el.com>,
"Ravi V Shankar" <ravi.v.shankar@...el.com>
Cc: iommu@...ts.linux-foundation.org, "x86" <x86@...nel.org>,
"linux-kernel" <linux-kernel@...r.kernel.org>,
Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v4 07/11] sched: Define and initialize a flag to identify valid PASID in the task
From: Peter Zijlstra <peterz@...radead.org>
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@...radead.org>
Co-developed-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
---
v4:
- Add "Reviewed-by: Thomas Gleixner <tglx@...utronix.de>" (Thomas).
v2:
- Change condition to more accurate CONFIG_IOMMU_SVA (Jacob)
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 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
--
2.35.1
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