kvm_guest_time_update unconditionally clears hv_clock.flags field,
so the notification never reaches the guest.
Fix it by allowing PVCLOCK_GUEST_STOPPED to passthrough.
Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3a53bcc..e8ce10f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1217,7 +1217,9 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
vcpu->last_kernel_ns = kernel_ns;
vcpu->last_guest_tsc = tsc_timestamp;
- vcpu->hv_clock.flags = 0;
+ /* only support PVCLOCK_GUEST_STOPPED flag ATM */
+ if (vcpu->hv_clock.flags != PVCLOCK_GUEST_STOPPED)
+ vcpu->hv_clock.flags = 0;
/*
* The interface expects us to write an even number signaling that the
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