Commit 8457fdfe authored Jan 21, 2019 by Cornelia Huck Committed by Michael S. Tsirkin Mar 06, 2019

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>

parent 59f3397c

Documentation/virtual/kvm/s390-diag.txt

+2 −1

Original line number	Diff line number	Diff line
		@@ -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.

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