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ptp_kvm: try to detect hypercall availability

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No point in registering the device if it cannot work.
The hypercall does not advertise itself, so we have to call it.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář 2017-02-15 20:27:20 +01:00 committed by Paolo Bonzini
parent 681bcea802
commit 4306f200c7
1 changed files with 7 additions and 0 deletions
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7
drivers/ptp/ptp_kvm.c
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@ -176,12 +176,19 @@ static void __exit ptp_kvm_exit(void)
static int __init ptp_kvm_init(void)
{
long ret;
clock_pair_gpa = slow_virt_to_phys(&clock_pair);
hv_clock = pvclock_pvti_cpu0_va();
if (!hv_clock)
return -ENODEV;
ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING, clock_pair_gpa,
KVM_CLOCK_PAIRING_WALLCLOCK);
if (ret == -KVM_ENOSYS || ret == -KVM_EOPNOTSUPP)
return -ENODEV;
kvm_ptp_clock.caps = ptp_kvm_caps;
kvm_ptp_clock.ptp_clock = ptp_clock_register(&kvm_ptp_clock.caps, NULL);