From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
"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>,
"Dave Hansen" <dave.hansen@intel.com>,
"Tony Luck" <tony.luck@intel.com>,
"Jean-Philippe Brucker" <jean-philippe@linaro.org>,
"Christoph Hellwig" <hch@infradeed.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>
Subject: [PATCH v3 12/13] sched: Define and initialize a flag to identify valid PASID in the task
Date: Wed, 17 Jun 2020 11:23:52 -0700 [thread overview]
Message-ID: <1592418233-17762-13-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1592418233-17762-1-git-send-email-fenghua.yu@intel.com>
From: Peter Zijlstra <peterz@infradead.org>
The flag is defined for the task to identify if the task has a valid
PASID. Its initial value is 0 when the task is forked/cloned. It will
be used shortly.
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>
---
v2:
- Add this patch to define the flag to identify valid PASID MSR (PeterZ)
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 b62e6aaf28f0..1b5a6e5c74ca 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -801,6 +801,9 @@ struct task_struct {
/* Stalled due to lack of memory */
unsigned in_memstall:1;
#endif
+#ifdef CONFIG_IOMMU_SUPPORT
+ unsigned has_valid_pasid:1;
+#endif
unsigned long atomic_flags; /* Flags requiring atomic access. */
diff --git a/kernel/fork.c b/kernel/fork.c
index 43b5f112604d..0a962bebdf88 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -955,6 +955,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
tsk->use_memdelay = 0;
#endif
+#ifdef CONFIG_IOMMU_SUPPORT
+ tsk->has_valid_pasid = 0;
+#endif
+
#ifdef CONFIG_MEMCG
tsk->active_memcg = NULL;
#endif
--
2.19.1
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next prev parent reply other threads:[~2020-06-17 18:24 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-17 18:23 [PATCH v3 00/13] x86: tag application address space for devices Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 01/13] iommu: Change type of pasid to unsigned int Fenghua Yu
2020-06-17 19:35 ` Andy Lutomirski
2020-06-17 19:39 ` Luck, Tony
2020-06-17 20:04 ` Andy Lutomirski
2020-06-18 7:12 ` Christoph Hellwig
2020-06-18 15:22 ` Fenghua Yu
2020-06-22 18:09 ` Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 02/13] ocxl: " Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 03/13] iommu/vt-d: Change flags type to unsigned int in binding mm Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 04/13] docs: x86: Add documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 05/13] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 06/13] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 07/13] x86/msr-index: Define IA32_PASID MSR Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 08/13] mm: Define pasid in mm Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 09/13] fork: Clear PASID for new mm Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 10/13] x86/process: Clear PASID state for a newly forked/cloned thread Fenghua Yu
2020-06-17 18:23 ` [PATCH v3 11/13] x86/mmu: Allocate/free PASID Fenghua Yu
2020-06-17 18:23 ` Fenghua Yu [this message]
2020-06-17 18:23 ` [PATCH v3 13/13] x86/traps: Fix up invalid PASID Fenghua Yu
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