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From: Frederic Weisbecker <frederic@kernel.org>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: linux-kernel@vger.kernel.org, Nitesh Lal <nilal@redhat.com>,
	Nicolas Saenz Julienne <nsaenzju@redhat.com>,
	Christoph Lameter <cl@linux.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Alex Belits <abelits@belits.com>, Peter Xu <peterx@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Oscar Shiang <oscar0225@livemail.tw>
Subject: Re: [patch v11 10/13] KVM: x86: process isolation work from VM-entry code path
Date: Mon, 7 Feb 2022 16:47:07 +0100	[thread overview]
Message-ID: <20220207154707.GC526451@lothringen> (raw)
In-Reply-To: <20220204173554.897857855@fedora.localdomain>

On Fri, Feb 04, 2022 at 02:35:47PM -0300, Marcelo Tosatti wrote:
> VM-entry code path is an entry point similar to userspace return
> when task isolation is concerned.
> 
> Call isolation_exit_to_user_mode before VM-enter.
> 
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
> 
> ---
> v11
> - Add TIF_TASK_ISOL bit to thread info flags and use it
>   to decide whether to perform task isolation work on
>   return to userspace                                   (Frederic W. Weisbecker)
> 
>  include/linux/entry-kvm.h |    4 +++-
>  kernel/entry/kvm.c        |   18 ++++++++++++++----
>  2 files changed, 17 insertions(+), 5 deletions(-)
> 
> Index: linux-2.6/kernel/entry/kvm.c
> ===================================================================
> --- linux-2.6.orig/kernel/entry/kvm.c
> +++ linux-2.6/kernel/entry/kvm.c
> @@ -2,6 +2,7 @@
>  
>  #include <linux/entry-kvm.h>
>  #include <linux/kvm_host.h>
> +#include <linux/task_isolation.h>
>  
>  static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work)
>  {
> @@ -22,6 +23,9 @@ static int xfer_to_guest_mode_work(struc
>  		if (ti_work & _TIF_NOTIFY_RESUME)
>  			tracehook_notify_resume(NULL);
>  
> +		if (ti_work & _TIF_TASK_ISOL)
> +			task_isol_exit_to_user_mode();
> +
>  		ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work);
>  		if (ret)
>  			return ret;
> 
> 

Do you need this?

diff --git a/include/linux/entry-kvm.h b/include/linux/entry-kvm.h
index 07c878d6e323..3588d6071caf 100644
--- a/include/linux/entry-kvm.h
+++ b/include/linux/entry-kvm.h
@@ -18,7 +18,7 @@
 
 #define XFER_TO_GUEST_MODE_WORK						\
 	(_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL |	\
-	 _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK)
+	 _TIF_NOTIFY_RESUME | _TIF_TASK_ISOL | ARCH_XFER_TO_GUEST_MODE_WORK)
 
 struct kvm_vcpu;
 

  reply	other threads:[~2022-02-07 15:53 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-04 17:35 [patch v11 00/13] extensible prctl task isolation interface and vmstat sync Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 01/13] s390: add support for TIF_TASK_ISOL Marcelo Tosatti
2022-02-07 11:40   ` Sven Schnelle
2022-02-04 17:35 ` [patch v11 02/13] x86: " Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 03/13] add basic task isolation prctl interface Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 04/13] add prctl task isolation prctl docs and samples Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 05/13] task isolation: sync vmstats on return to userspace Marcelo Tosatti
2022-02-07 14:57   ` Frederic Weisbecker
2022-02-07 15:16     ` Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 06/13] procfs: add per-pid task isolation state Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 07/13] task isolation: sync vmstats conditional on changes Marcelo Tosatti
2022-02-07 15:19   ` Frederic Weisbecker
2022-03-10 16:30     ` Marcelo Tosatti
2022-02-07 15:29   ` Frederic Weisbecker
2022-02-04 17:35 ` [patch v11 08/13] task isolation: enable return to userspace processing Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 09/13] task isolation: add preempt notifier to sync per-CPU vmstat dirty info to thread info Marcelo Tosatti
2022-02-07 15:36   ` Frederic Weisbecker
2022-02-04 17:35 ` [patch v11 10/13] KVM: x86: process isolation work from VM-entry code path Marcelo Tosatti
2022-02-07 15:47   ` Frederic Weisbecker [this message]
2022-03-10 16:35     ` Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 11/13] mm: vmstat: move need_update Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 12/13] mm: vmstat_refresh: avoid queueing work item if cpu stats are clean Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 13/13] task isolation: only TIF_TASK_ISOL if task isolation is enabled Marcelo Tosatti
2022-02-07 15:38   ` Frederic Weisbecker
2022-02-19  8:02 ` [patch v11 00/13] extensible prctl task isolation interface and vmstat sync Oscar Shiang
2022-02-23 17:31   ` Marcelo Tosatti
2022-03-08  6:32     ` Oscar Shiang
2022-03-08 13:12       ` Marcelo Tosatti
2022-03-09 15:31         ` Oscar Shiang
2022-03-08  7:20 ` Oscar Shiang

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