rcutorture: Add CFcommon.arch for arch-specific Kconfig options

Add CFcommon.arch for arch-specific Kconfig options.

In accordance with [1], [2] and [3], move the x86-specific kernel option
CONFIG_HYPERVISOR_GUEST to CFcommon.i686 and CFcommon.x86_64, and also
move the x86/PowerPC CONFIG_KVM_GUEST Kconfig option to CFcommon.i686,
CFcommon.x86_64, and CFcommon.ppc64le.

The "arch" in CFcommon.arch is taken from the "uname -m" command.

[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/all/ZnBkHosMDhsh4H8g@J2N7QTR9R3/

Tested in x86_64 and PPC VM of Open Source Lab of Oregon State University.

Fixes: a6fda6da ("rcutorture: Tweak kvm options")
Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>

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 $resdir | sed -e 's/\.[0-9]\+$//'`

tools/testing/selftests/rcutorture/configs/rcu/CFcommon

 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
 CONFIG_KCSAN_REPORT_VALUE_CHANGE_ONLY=n

tools/testing/selftests/rcutorture/configs/rcu/CFcommon.i686

+CONFIG_HYPERVISOR_GUEST=y
+CONFIG_KVM_GUEST=y

tools/testing/selftests/rcutorture/configs/rcu/CFcommon.ppc64le

+CONFIG_KVM_GUEST=y

tools/testing/selftests/rcutorture/configs/rcu/CFcommon.x86_64

+CONFIG_HYPERVISOR_GUEST=y
+CONFIG_KVM_GUEST=y