KVM: s390: base hrtimer on a monotonic clock

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>
Cc: stable@vger.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 14cdf1c3b99527c319fee9567808b3ca2838acbc..37ef06c19c31cbbede3fcf0efb30ea6d71f8fa00 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -735,7 +735,7 @@ 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;