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authorMichael S. Tsirkin <mst@redhat.com>2012-09-05 20:47:45 +0200
committerRusty Russell <rusty@rustcorp.com.au>2012-09-28 07:35:15 +0200
commit6457f126c888b3481fdae6f702e616cd0c79646e (patch)
treeeae794db0b3983d2a901ecf6471eda6e3f9ff26f /drivers/s390/kvm
parentvirtio: introduce an API to set affinity for a virtqueue (diff)
downloadlinux-6457f126c888b3481fdae6f702e616cd0c79646e.tar.xz
linux-6457f126c888b3481fdae6f702e616cd0c79646e.zip
virtio: support reserved vqs
virtio network device multiqueue support reserves vq 3 for future use (useful both for future extensions and to make it pretty - this way receive vqs have even and transmit - odd numbers). Make it possible to skip initialization for specific vq numbers by specifying NULL for name. Document this usage as well as (existing) NULL callback. Drivers using this not coded up yet, so I simply tested with virtio-pci and verified that this patch does not break existing drivers. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/s390/kvm')
-rw-r--r--drivers/s390/kvm/kvm_virtio.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 5565af20592f..7dabef624da3 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -190,6 +190,9 @@ static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
if (index >= kdev->desc->num_vq)
return ERR_PTR(-ENOENT);
+ if (!name)
+ return NULL;
+
config = kvm_vq_config(kdev->desc)+index;
err = vmem_add_mapping(config->address,