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authorMichael S. Tsirkin <mst@redhat.com>2014-10-14 23:51:55 (GMT)
committerRusty Russell <rusty@rustcorp.com.au>2014-10-14 23:54:56 (GMT)
commit22b7050a024d7deb0c9ef1e14ed73e3b1e369f24 (patch)
treebe21b9a75aa1b5a95d8bb3ab7bf9470669e643bb /include
parentc6716bae52f97347e25166c6270aa98693d9212c (diff)
virtio: defer config changed notifications
Defer config changed notifications that arrive during probe/scan/freeze/restore. This will allow drivers to set DRIVER_OK earlier, without worrying about racing with config change interrupts. This change will also benefit old hypervisors (before 2009) that send interrupts without checking DRIVER_OK: previously, the callback could race with driver-specific initialization. This will also help simplify drivers. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (cosmetic changes)
Diffstat (limited to 'include')
-rw-r--r--include/linux/virtio.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 8df7ba8..65261a7 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -79,6 +79,9 @@ bool virtqueue_is_broken(struct virtqueue *vq);
* virtio_device - representation of a device using virtio
* @index: unique position on the virtio bus
* @failed: saved value for CONFIG_S_FAILED bit (for restore)
+ * @config_enabled: configuration change reporting enabled
+ * @config_change_pending: configuration change reported while disabled
+ * @config_lock: protects configuration change reporting
* @dev: underlying device.
* @id: the device type identification (used to match it with a driver).
* @config: the configuration ops for this device.
@@ -90,6 +93,9 @@ bool virtqueue_is_broken(struct virtqueue *vq);
struct virtio_device {
int index;
bool failed;
+ bool config_enabled;
+ bool config_change_pending;
+ spinlock_t config_lock;
struct device dev;
struct virtio_device_id id;
const struct virtio_config_ops *config;

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