ptp_kvm: probe for kvm guest availability

In the event of moving pvclock_pvti_cpu0_va() definition to common pvclock code, this function would return a value on non KVM guests. Later on this would fail with a GPF on ptp_kvm_init when running on a Xen guest. Therefore, ptp_kvm_init() should check whether it is running in a KVM guest. Signed-off-by: Joao Martins <[email protected]> Acked-by: Radim Krčmář <[email protected]> Signed-off-by: Boris Ostrovsky <[email protected]>
ambv · Nov 8, 2017 · 001f60e · 001f60e
1 parent 52847bb
commit 001f60e
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/ptp/ptp_kvm.c b/drivers/ptp/ptp_kvm.c
@@ -178,6 +178,9 @@ static int __init ptp_kvm_init(void)
 {
 	long ret;
 
+	if (!kvm_para_available())
+		return -ENODEV;
+
 	clock_pair_gpa = slow_virt_to_phys(&clock_pair);
 	hv_clock = pvclock_pvti_cpu0_va();