korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-16 00:34:20 +08:00
Code Issues Packages Projects Releases Wiki Activity

virtio-ccw: diag 500 may return a negative cookie

Browse Source 
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>
This commit is contained in:
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/virtual/kvm/s390-diag.txt
View File

@ -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.