From: Cornelia Huck <cohuck@redhat.com>
To: "Michael S . Tsirkin" <mst@redhat.com>
Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org,
Cornelia Huck <cohuck@redhat.com>,
virtualization@lists.linux-foundation.org,
Halil Pasic <pasic@linux.ibm.com>
Subject: [PULL 1/1] virtio-ccw: diag 500 may return a negative cookie
Date: Wed, 19 Dec 2018 11:14:14 +0100 [thread overview]
Message-ID: <20181219101414.13901-2-cohuck@redhat.com> (raw)
In-Reply-To: <20181219101414.13901-1-cohuck@redhat.com>
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>
---
Documentation/virtual/kvm/s390-diag.txt | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Documentation/virtual/kvm/s390-diag.txt b/Documentation/virtual/kvm/s390-diag.txt
index 48c4921794ed..7c52e5f8b210 100644
--- a/Documentation/virtual/kvm/s390-diag.txt
+++ b/Documentation/virtual/kvm/s390-diag.txt
@@ -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.
--
2.17.2
next prev parent reply other threads:[~2018-12-19 10:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-19 10:14 [PULL 0/1] virtio-ccw: one more patch for 4.21 Cornelia Huck
2018-12-19 10:14 ` Cornelia Huck [this message]
2019-01-03 8:55 ` Cornelia Huck
2019-01-03 16:50 ` Michael S. Tsirkin
2019-01-03 16:51 ` Michael S. Tsirkin
2019-01-04 9:56 ` Cornelia Huck
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