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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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8
drivers/s390/kvm/kvm_virtio.c
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@@ -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;
}
/*