[Xen-devel] [PATCH v8 1/5] ptp_kvm: probe for kvm guest availability

[Joao Martins <joao.m.martins@xxxxxxxxxx>]

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 <joao.m.martins@xxxxxxxxxx>
Acked-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
---
Changes since v7:
 * Add Radim's Acked-by
---
 drivers/ptp/ptp_kvm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ptp/ptp_kvm.c b/drivers/ptp/ptp_kvm.c
index 2b1b212c219e..e04d7b2ecb3a 100644
--- 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();
 
-- 
2.11.0


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