virtio_ccw: pass a cookie value to kvm hypercall

Lookups by channel/vq pair on host during virtio notifications might be
expensive.  Interpret hypercall return value as a cookie which host can
use to do device lookups for the next notification more efficiently.

[CH: Fix line > 80 chars]
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index 2029b6c..3d65752 100644 (file)
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -77,6 +77,7 @@ struct virtio_ccw_vq_info {
        void *queue;
        struct vq_info_block *info_block;
        struct list_head node;
+       long cookie;
 };
 
 #define KVM_VIRTIO_CCW_RING_ALIGN 4096
@@ -145,15 +146,18 @@ static int ccw_io_helper(struct virtio_ccw_device *vcdev,
 }
 
 static inline long do_kvm_notify(struct subchannel_id schid,
-                                unsigned long queue_index)
+                                unsigned long queue_index,
+                                long cookie)
 {
        register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
        register struct subchannel_id __schid asm("2") = schid;
        register unsigned long __index asm("3") = queue_index;
        register long __rc asm("2");
+       register long __cookie asm("4") = cookie;
 
        asm volatile ("diag 2,4,0x500\n"
-                     : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index)
+                     : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
+                     "d"(__cookie)
                      : "memory", "cc");
        return __rc;
 }
@@ -166,7 +170,8 @@ static void virtio_ccw_kvm_notify(struct virtqueue *vq)
 
        vcdev = to_vc_device(info->vq->vdev);
        ccw_device_get_schid(vcdev->cdev, &schid);
-       do_kvm_notify(schid, virtqueue_get_queue_index(vq));
+       info->cookie = do_kvm_notify(schid, virtqueue_get_queue_index(vq),
+                                    info->cookie);
 }
 
 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,