linux-kernel - Re: [PATCH V3] rcutorture: Add CFcommon.arch for the various arch's need

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Message-ID: <7150e2fa-c627-435c-97d2-80065d1f1920@paulmck-laptop>
Date: Tue, 18 Jun 2024 07:30:00 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Zhouyi Zhou <zhouzhouyi@...il.com>
Cc: Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org,
	rcu@...r.kernel.org, linux-kselftest@...r.kernel.org,
	lance@...osl.org
Subject: Re: [PATCH V3] rcutorture: Add CFcommon.arch for the various arch's
 need

On Tue, Jun 18, 2024 at 06:41:22AM +0800, Zhouyi Zhou wrote:
> On Tue, Jun 18, 2024 at 12:47 AM Paul E. McKenney <paulmck@...nel.org> wrote:
> >
> > On Mon, Jun 17, 2024 at 05:28:14PM +0100, Mark Rutland wrote:
> > > On Tue, Jun 11, 2024 at 07:57:29PM -0700, Paul E. McKenney wrote:
> > > > On Wed, Jun 12, 2024 at 01:35:27AM +0000, Zhouyi Zhou wrote:
> > > > > Add CFcommon.arch for the various arch's need for rcutorture.
> > > > >
> > > > > According to [1] and [2], this patch
> > > > > Fixes: a6fda6dab93c ("rcutorture: Tweak kvm options") by moving
> > > > > x86 specific kernel option CONFIG_HYPERVISOR_GUEST to CFcommon.arch
> > > > >
> > > > > The patch has been revised and improved under
> > > > > Paul E. McKenney's guidance [3].
> > > > >
> > > > > [1] https://lore.kernel.org/all/20240427005626.1365935-1-zhouzhouyi@gmail.com/
> > > > > [2] https://lore.kernel.org/all/059d36ce-6453-42be-a31e-895abd35d590@paulmck-laptop/
> > > > > [3] https://lore.kernel.org/lkml/cd3709dc-2c08-4ac2-a19b-d8edb66195e3@paulmck-laptop/T/
> > > > >
> > > > > Tested in x86_64 and PPC VM of Open Source Lab of Oregon State University.
> > > > >
> > > > > Signed-off-by: Zhouyi Zhou <zhouzhouyi@...il.com>
> > > >
> > > > Much better, thank you!
> > > >
> > > > I queued and pushed for review and testing with the usual editing,
> > > > so please let me know if I messed anything up.
> > > >
> > > > I added Mark on CC in case he has thoughts from an ARM perspective.
> > >
> > > Ah, thanks!
> > >
> > > >From a quick scan, the only thing I spot is that CONFIG_KVM_GUEST is
> > > also not an arm64 thing, and only exists on x86 & powerpc, so pulling
> > > that out too would be nice.
> yes, CONFIG_KVM_GUEST exists in powerpc & x86, which makes me think it
> is global.
> >
> > Thank you for looking this over!
> >
> > Zhouyi, would you be willing to add this change, either as a new version
> > of this patch or as a new patch on top of it?  (Your choice.)
> Thanks to Paul and Mark's guidance, I achieved a lot during this process ;-)
> 
> I am going to create a new version of the patch, and test is both on
> X86 and PowerPC

Very good, looking forward to it!

							Thanx, Paul

> Cheers
> Zhouyi
> >
> > > That aside, this looks good to me; having the infrastructure to do this
> > > per-arch is nice!
> >
> > Glad you like it!  May we have your ack?
> Very happy that Mark likes it ;-)
> >
> >                                                         Thanx, Paul
> >
> > > Mark.
> > >
> > > >
> > > >                                                     Thanx, Paul
> > > >
> > > > ------------------------------------------------------------------------
> > > >
> > > > commit 29cf4c63d04b9752a32e33d46a57717121353ef7
> > > > Author: Zhouyi Zhou <zhouzhouyi@...il.com>
> > > > Date:   Wed Jun 12 01:35:27 2024 +0000
> > > >
> > > >     rcutorture: Add CFcommon.arch for the various arch's need
> > > >
> > > >     Add CFcommon.arch for the various arch's need for rcutorture.
> > > >
> > > >     In accordance with [1] and [2], this patch moves x86 specific kernel
> > > >     option CONFIG_HYPERVISOR_GUEST to CFcommon.arch
> > > >
> > > >     [1] https://lore.kernel.org/all/20240427005626.1365935-1-zhouzhouyi@gmail.com/
> > > >     [2] https://lore.kernel.org/all/059d36ce-6453-42be-a31e-895abd35d590@paulmck-laptop/
> > > >
> > > >     Tested in x86_64 and PPC VM of Open Source Lab of Oregon State University.
> > > >
> > > >     Link: https://lore.kernel.org/lkml/cd3709dc-2c08-4ac2-a19b-d8edb66195e3@paulmck-laptop/T/
> > > >
> > > >     Fixes: a6fda6dab93c ("rcutorture: Tweak kvm options")
> > > >     Suggested-by: Paul E. McKenney <paulmck@...nel.org>
> > > >     Signed-off-by: Zhouyi Zhou <zhouzhouyi@...il.com>
> > > >     Cc: Mark Rutland <mark.rutland@....com>
> > > >     Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> > > >
> > > > diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
> > > > index b33cd87536899..ad79784e552d2 100755
> > > > --- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
> > > > +++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
> > > > @@ -68,6 +68,8 @@ config_override_param "--gdb options" KcList "$TORTURE_KCONFIG_GDB_ARG"
> > > >  config_override_param "--kasan options" KcList "$TORTURE_KCONFIG_KASAN_ARG"
> > > >  config_override_param "--kcsan options" KcList "$TORTURE_KCONFIG_KCSAN_ARG"
> > > >  config_override_param "--kconfig argument" KcList "$TORTURE_KCONFIG_ARG"
> > > > +config_override_param "$config_dir/CFcommon.$(uname -m)" KcList \
> > > > +                 "`cat $config_dir/CFcommon.$(uname -m) 2> /dev/null`"
> > > >  cp $T/KcList $resdir/ConfigFragment
> > > >
> > > >  base_resdir=`echo $resdir | sed -e 's/\.[0-9]\+$//'`
> > > > diff --git a/tools/testing/selftests/rcutorture/configs/rcu/CFcommon b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon
> > > > index 0e92d85313aa7..cf0387ae53584 100644
> > > > --- a/tools/testing/selftests/rcutorture/configs/rcu/CFcommon
> > > > +++ b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon
> > > > @@ -1,6 +1,5 @@
> > > >  CONFIG_RCU_TORTURE_TEST=y
> > > >  CONFIG_PRINTK_TIME=y
> > > > -CONFIG_HYPERVISOR_GUEST=y
> > > >  CONFIG_PARAVIRT=y
> > > >  CONFIG_KVM_GUEST=y
> > > >  CONFIG_KCSAN_ASSUME_PLAIN_WRITES_ATOMIC=n
> > > > diff --git a/tools/testing/selftests/rcutorture/configs/rcu/CFcommon.i686 b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon.i686
> > > > new file mode 100644
> > > > index 0000000000000..2770560d56a0c
> > > > --- /dev/null
> > > > +++ b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon.i686
> > > > @@ -0,0 +1 @@
> > > > +CONFIG_HYPERVISOR_GUEST=y
> > > > diff --git a/tools/testing/selftests/rcutorture/configs/rcu/CFcommon.x86_64 b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon.x86_64
> > > > new file mode 100644
> > > > index 0000000000000..2770560d56a0c
> > > > --- /dev/null
> > > > +++ b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon.x86_64
> > > > @@ -0,0 +1 @@
> > > > +CONFIG_HYPERVISOR_GUEST=y