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>,
"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 v4 11/12] sched: Define and initialize a flag to identify valid PASID in the task
Date: Thu, 25 Jun 2020 13:17:21 -0700 [thread overview]
Message-ID: <1593116242-31507-12-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1593116242-31507-1-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
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-06-25 20:18 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-25 20:17 [PATCH v4 00/12] x86: tag application address space for devices Fenghua Yu
2020-06-25 20:17 ` [PATCH v4 01/12] iommu: Change type of pasid to u32 Fenghua Yu
2020-06-26 1:13 ` Lu Baolu
2020-06-25 20:17 ` [PATCH v4 02/12] iommu/vt-d: Change flags type to unsigned int in binding mm Fenghua Yu
2020-06-26 1:14 ` Lu Baolu
2020-06-25 20:17 ` [PATCH v4 03/12] docs: x86: Add documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2020-06-25 20:17 ` [PATCH v4 04/12] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Fenghua Yu
2020-06-25 20:17 ` [PATCH v4 05/12] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature Fenghua Yu
2020-06-25 20:17 ` [PATCH v4 06/12] x86/msr-index: Define IA32_PASID MSR Fenghua Yu
2020-06-25 20:17 ` [PATCH v4 07/12] mm: Define pasid in mm Fenghua Yu
2020-06-25 20:17 ` [PATCH v4 08/12] fork: Clear PASID for new mm Fenghua Yu
2020-06-25 20:17 ` [PATCH v4 09/12] x86/process: Clear PASID state for a newly forked/cloned thread Fenghua Yu
2020-06-25 20:17 ` [PATCH v4 10/12] x86/mmu: Allocate/free PASID Fenghua Yu
2020-06-26 1:42 ` Lu Baolu
2020-06-25 20:17 ` Fenghua Yu [this message]
2020-06-25 20:17 ` [PATCH v4 12/12] x86/traps: Fix up invalid PASID Fenghua Yu
2020-06-26 1:46 ` Lu Baolu
2020-06-26 9:44 ` Peter Zijlstra
2020-06-26 18:10 ` Luck, Tony
2020-06-26 18:15 ` Borislav Petkov
2020-06-26 18:23 ` Dave Hansen
2020-06-26 18:35 ` Fenghua Yu
2020-06-26 18:16 ` Fenghua Yu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1593116242-31507-12-git-send-email-fenghua.yu@intel.com \
--to=fenghua.yu@intel.com \
--cc=ashok.raj@intel.com \
--cc=baolu.lu@linux.intel.com \
--cc=bp@alien8.de \
--cc=dave.hansen@intel.com \
--cc=dave.jiang@intel.com \
--cc=dwmw2@infradead.org \
--cc=hch@infradeed.org \
--cc=hpa@zytor.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jacob.jun.pan@intel.com \
--cc=jean-philippe@linaro.org \
--cc=joro@8bytes.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=ravi.v.shankar@intel.com \
--cc=sohil.mehta@intel.com \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).