KVM: s390: base hrtimer on a monotonic clock

commit 0ac96caf0f9381088c673a16d910b1d329670edf upstream.

The hrtimer that handles the wait with enabled timer interrupts
should not be disturbed by changes of the host time.

This patch changes our hrtimer to be based on a monotonic clock.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 55aade49b6d1164f1ecd01f14f5cdb841077df6d..ced09d8738b43273055344d1358df50587e629d8 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -662,7 +662,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
                if (rc)
                        return rc;
        }
-       hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
+       hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
        get_cpu_id(&vcpu->arch.cpu_id);
        vcpu->arch.cpu_id.version = 0xff;