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authorHeinz Graalfs <graalfs@linux.vnet.ibm.com>2013-10-29 09:38:50 +1030
committerRusty Russell <rusty@rustcorp.com.au>2013-10-29 11:28:11 +1030
commit46f9c2b925ac12e5ad8b8b7c90c71dacc9d5db37 (patch)
tree39b9bd752cb3cb43a5e11d4f0fc35f425f1d02e2 /drivers/s390/kvm
parent630b54d33493d1f67e79b148b5e361c5bbd3f29d (diff)
downloadop-kernel-dev-46f9c2b925ac12e5ad8b8b7c90c71dacc9d5db37.zip
op-kernel-dev-46f9c2b925ac12e5ad8b8b7c90c71dacc9d5db37.tar.gz
virtio_ring: change host notification API
Currently a host kick error is silently ignored and not reflected in the virtqueue of a particular virtio device. Changing the notify API for guest->host notification seems to be one prerequisite in order to be able to handle such errors in the context where the kick is triggered. This patch changes the notify API. The notify function must return a bool return value. It returns false if the host notification failed. Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/s390/kvm')
-rw-r--r--drivers/s390/kvm/kvm_virtio.c8
-rw-r--r--drivers/s390/kvm/virtio_ccw.c5
2 files changed, 10 insertions, 3 deletions
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index af2166f..1abd0db 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -166,11 +166,15 @@ static void kvm_reset(struct virtio_device *vdev)
* make a hypercall. We hand the address of the virtqueue so the Host
* knows which virtqueue we're talking about.
*/
-static void kvm_notify(struct virtqueue *vq)
+static bool kvm_notify(struct virtqueue *vq)
{
+ long rc;
struct kvm_vqconfig *config = vq->priv;
- kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, config->address);
+ rc = kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, config->address);
+ if (rc < 0)
+ return false;
+ return true;
}
/*
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index 779dc51..d629717 100644
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -162,7 +162,7 @@ static inline long do_kvm_notify(struct subchannel_id schid,
return __rc;
}
-static void virtio_ccw_kvm_notify(struct virtqueue *vq)
+static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
{
struct virtio_ccw_vq_info *info = vq->priv;
struct virtio_ccw_device *vcdev;
@@ -171,6 +171,9 @@ static void virtio_ccw_kvm_notify(struct virtqueue *vq)
vcdev = to_vc_device(info->vq->vdev);
ccw_device_get_schid(vcdev->cdev, &schid);
info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
+ if (info->cookie < 0)
+ return false;
+ return true;
}
static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
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