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virtio-ccw: diag 500 may return a negative cookie 

If something goes wrong in the kvm io bus handling, the virtio-ccw
diagnose may return a negative error value in the cookie gpr.

Document this.

Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
hifive-unleashed-5.1
Cornelia Huck 2019-01-21 13:19:42 +01:00 committed by Michael S. Tsirkin
parent 59f3397ca7
commit 8457fdfeb1
1 changed files with 2 additions and 1 deletions
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3
Documentation/virtual/kvm/s390-diag.txt
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@ -68,7 +68,8 @@ Subcode 3 - virtio-ccw notification
identifier, it is ignored.
After completion of the DIAGNOSE call, general register 2 may contain
a 64bit identifier (in the kvm_io_bus cookie case).
a 64bit identifier (in the kvm_io_bus cookie case), or a negative
error value, if an internal error occurred.
See also the virtio standard for a discussion of this hypercall.