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virtio_ring: change host notification API

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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>
This commit is contained in:
Heinz Graalfs
2013-10-29 09:38:50 +10:30
committed by Rusty Russell
parent 630b54d334
commit 46f9c2b925
10 changed files with 32 additions and 15 deletions
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5
drivers/s390/kvm/virtio_ccw.c
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@@ -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,