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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 <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
This commit is contained in:
Heinz Graalfs 2013-10-29 09:38:50 +10:30 • committed by Rusty Russell
commit 46f9c2b925
10 changed files with 32 additions and 15 deletions
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3
drivers/lguest/lguest_device.c
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@ -229,7 +229,7 @@ struct lguest_vq_info {
* make a hypercall. We hand the physical address of the virtqueue so the Host
* knows which virtqueue we're talking about.
*/
static void lg_notify(struct virtqueue *vq)
static bool lg_notify(struct virtqueue *vq)
{
/*
* We store our virtqueue information in the "priv" pointer of the
@ -238,6 +238,7 @@ static void lg_notify(struct virtqueue *vq)
struct lguest_vq_info *lvq = vq->priv;
hcall(LHCALL_NOTIFY, lvq->config.pfn << PAGE_SHIFT, 0, 0, 0);
return true;
}
/* An extern declaration inside a C file is bad form. Don't do it. */