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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2019-04-24 09:34:46 +0200
committerPaul E. McKenney <paulmck@linux.ibm.com>2019-05-28 09:06:09 -0700
commita6fda6dab93c2c06ef4b8cb4b9258df6674d2438 (patch)
tree1238c20bbf61424d72bce2e0dd5144b198ba967c /tools/testing/selftests/rcutorture/configs
parentc682db558e6eec10a711b0a6bcb8c35fd15f6a39 (diff)
rcutorture: Tweak kvm options
In one of my rcutorture tests the TSC clocksource got marked unstable due to a large difference in the TSC value. I'm not sure if the guest run for a long time with disabled interrupts or if the host was very busy and didn't schedule the guest for some time. I took a look on the qemu/KVM options and decided to update the options: - Use kvm{32|64} as CPU. We could probably use `host' (like ARM does) for maximum available features but since we don't run any userland I'm not sure if it makes any difference. - Drop the "noapic" option. There is no history why the APIC was disabled, I see no reason for it. Once old qemu versions fade away, we can add "x2apic=on,tsc-deadline=on,hypervisor=on,tsc_adjust=on". - Additional config options. It ensures that the kernel knowns that it runs as a kvm guest and can use virt devices like the kvm-clock as clocksource. The kvm-clock was the main motivation here. - I didn't add a random HW device. It would make the random device ready earlier (not it doesn't complete the initialisation at all) but I doubt that there is any need for this. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> [ paulmck: The world is not quite ready for CONFIG_PARAVIRT_SPINLOCKS=y and x2apic, so they are omitted for the time being. ] Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'tools/testing/selftests/rcutorture/configs')
-rw-r--r--tools/testing/selftests/rcutorture/configs/rcu/CFcommon3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/CFcommon b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon
index d2d2a86139db..e19a444a0684 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/CFcommon
+++ b/tools/testing/selftests/rcutorture/configs/rcu/CFcommon
@@ -1,2 +1,5 @@
CONFIG_RCU_TORTURE_TEST=y
CONFIG_PRINTK_TIME=y
+CONFIG_HYPERVISOR_GUEST=y
+CONFIG_PARAVIRT=y
+CONFIG_KVM_GUEST=y