KVM: arm64: pvtime: steal-time is only supported when configured

Don't confuse the guest by saying steal-time is supported when
it hasn't been configured by userspace and won't work.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200804170604.42662-2-drjones@redhat.com

diff --git a/arch/arm64/kvm/pvtime.c b/arch/arm64/kvm/pvtime.c
index f7b52ce..c3ef4eb 100644 (file)
--- a/arch/arm64/kvm/pvtime.c
+++ b/arch/arm64/kvm/pvtime.c
@@ -43,7 +43,8 @@ long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu)
        switch (feature) {
        case ARM_SMCCC_HV_PV_TIME_FEATURES:
        case ARM_SMCCC_HV_PV_TIME_ST:
-               val = SMCCC_RET_SUCCESS;
+               if (vcpu->arch.steal.base != GPA_INVALID)
+                       val = SMCCC_RET_SUCCESS;
                break;
        }