From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
"Joerg Roedel" <joro@8bytes.org>,
"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>,
"Felix Kuehling" <Felix.Kuehling@amd.com>,
"Dave Hansen" <dave.hansen@intel.com>,
"Tony Luck" <tony.luck@intel.com>,
"Jean-Philippe Brucker" <jean-philippe@linaro.org>,
"Christoph Hellwig" <hch@infradead.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>,
amd-gfx <amd-gfx@lists.freedesktop.org>
Subject: [PATCH v6 11/12] sched: Define and initialize a flag to identify valid PASID in the task
Date: Mon, 13 Jul 2020 16:48:06 -0700 [thread overview]
Message-ID: <1594684087-61184-12-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1594684087-61184-1-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 692e327d7455..042d6f5cde6a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -800,6 +800,9 @@ 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:[~2020-07-13 23:48 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-13 23:47 [PATCH v6 00/12] x86: tag application address space for devices Fenghua Yu
2020-07-13 23:47 ` [PATCH v6 01/12] iommu: Change type of pasid to u32 Fenghua Yu
2020-07-14 2:45 ` Liu, Yi L
2020-07-14 13:54 ` Fenghua Yu
2020-07-14 13:56 ` Liu, Yi L
2020-07-22 14:03 ` Joerg Roedel
2020-07-22 17:21 ` Fenghua Yu
2020-07-13 23:47 ` [PATCH v6 02/12] iommu/vt-d: Change flags type to unsigned int in binding mm Fenghua Yu
2020-07-13 23:47 ` [PATCH v6 03/12] docs: x86: Add documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2020-07-14 3:25 ` Liu, Yi L
2020-07-15 23:32 ` Fenghua Yu
2020-07-13 23:47 ` [PATCH v6 04/12] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 05/12] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 06/12] x86/msr-index: Define IA32_PASID MSR Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 07/12] mm: Define pasid in mm Fenghua Yu
2020-07-13 23:48 ` [PATCH v6 08/12] fork: Clear PASID for new mm Fenghua Yu
2021-02-24 10:19 ` Jean-Philippe Brucker
2021-02-25 22:17 ` Fenghua Yu
2021-03-01 23:00 ` Jacob Pan
2021-03-02 10:43 ` Jean-Philippe Brucker
2020-07-13 23:48 ` [PATCH v6 09/12] x86/process: Clear PASID state for a newly forked/cloned thread Fenghua Yu
2020-08-01 1:44 ` Andy Lutomirski
2020-07-13 23:48 ` [PATCH v6 10/12] x86/mmu: Allocate/free PASID Fenghua Yu
2020-07-13 23:48 ` Fenghua Yu [this message]
2020-07-13 23:48 ` [PATCH v6 12/12] x86/traps: Fix up invalid PASID Fenghua Yu
2020-07-31 23:34 ` Andy Lutomirski
2020-08-01 0:42 ` Fenghua Yu
2020-08-03 15:03 ` Dave Hansen
2020-08-03 15:12 ` Andy Lutomirski
2020-08-03 15:19 ` Raj, Ashok
2020-08-03 16:36 ` Dave Hansen
2020-08-03 17:16 ` Andy Lutomirski
2020-08-03 17:34 ` Dave Hansen
2020-08-03 19:24 ` Andy Lutomirski
2020-08-01 1:28 ` Andy Lutomirski
2020-08-03 17:19 ` Fenghua Yu
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