On 05/03/13 23:56, Michael S. Tsirkin wrote:
The patch f56a12475ff1b8aa61210d08522c3c8aaf0e2648 "vhost: backend
masking support" breaks virtio-net + vhost=on on PPC64 platform.
The problem command line is:
1) -netdev tap,id=tapnet,ifname=tap0,script=qemu-ifup.sh,vhost=on \
-device virtio-net-pci,netdev=tapnet,addr=0.0 \
I think the issue is irqfd in not supported on kvm ppc.
How can I make sure this is the case? Some work has been done there
recently but midnight is quite late to figure this out :)
Could you please check this:
+ /* If guest supports masking, set up irqfd now.
+ * Otherwise, delay until unmasked in the frontend.
+ */
+ if (proxy->vdev->guest_notifier_mask) {
+ ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
+ if (ret < 0) {
+ kvm_virtio_pci_vq_vector_release(proxy, vector);
+ goto undo;
+ }
+ }
Could you please add a printf before "undo" and check whether the
error path above is triggered?
Checked, it is not triggered.
--
Alexey
