On Fri, May 31, 2024 at 11:53:47PM +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.x86
>
> [1] https://lore.kernel.org/all/20240427005626.1365935-1-zhouzhouyi@xxxxxxxxx/
> [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.
>
> Signed-off-by: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
> ---
> Hi Paul,
>
> I tried very hard to find in Linux kernel on how to dig out
> the x86 specific kernel option CONFIG_HYPERVISOR_GUEST before configcheck.sh
> generates ConfigFragment.diags.
>
> I can only find this functionality in scripts/kconfig/conf which travels
> the Kconfig hierarchy.
>
> But the output of scripts/kconfig/conf, which is .config
> is also one of the input of configcheck.sh:
> ```
> kvm-recheck.sh: configcheck.sh $i/.config $i/ConfigFragment > $i/ConfigFragment.diags 2>&1
> ```
>
> I feel some logic paradox in it ;-)
At least now we can say that you looked.
> So, I pick the simplest way.
Very good, thank you!
> One more thing, recent change in include/linux/bitmap.h cause the make
> of allmodconfig fail because of warning on both x86 platforms, I am
> going to do research on it.
Thank you, looking forward to seeing what you come up with.
One question below.
> Thank your for your guidance
> Zhouyi
> --
> tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh | 9 +++++++++
> tools/testing/selftests/rcutorture/configs/rcu/CFcommon | 1 -
> .../selftests/rcutorture/configs/rcu/CFcommon.x86 | 1 +
> 3 files changed, 10 insertions(+), 1 deletion(-)
> create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/CFcommon.x86
>
> 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 b33cd8753689..5332224238ba 100755
> --- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
> +++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
> @@ -62,6 +62,15 @@ config_override_param () {
> }
>
> echo > $T/KcList
> +if uname -m | grep -q 86
Why not just use "uname -m" output itself for the filename extension?
That way, we wouldn't need this "if" statement. Or are you looking to
map both "i686" and "x86_64" to "x86"?
> +# TODO: add other architecture-specific common configuration when needed
> +then
> + if test -f $config_dir/CFcommon.x86
Do we really need this inner "if"? The config_override_param() bash
function already checks for ran empty-string third argument. Or does
this cause some other problem?
> + then
> + config_override_param "$config_dir/CFcommon.x86" KcList\
> + "`cat $config_dir/CFcommon.x86 2> /dev/null`"
> + fi
> +fi
> config_override_param "$config_dir/CFcommon" KcList "`cat $config_dir/CFcommon 2> /dev/null`"
Also, the CFcommon.x86 check shouild follow the CFcommon check. This
allows architecture-specific values to override the global ones.
Thanx, Paul
> config_override_param "$config_template" KcList "`cat $config_template 2> /dev/null`"
> config_override_param "--gdb options" KcList "$TORTURE_KCONFIG_GDB_ARG"
> diff --git a/tools/testing/selftests/rcutorture/configs/rcu/CFcommon b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon
> index 0e92d85313aa..cf0387ae5358 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.x86 b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon.x86
> new file mode 100644
> index 000000000000..2770560d56a0
> --- /dev/null
> +++ b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon.x86
> @@ -0,0 +1 @@
> +CONFIG_HYPERVISOR_GUEST=y
> --
> 2.25.1
>
