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[RFC 6/8] virtio-ccw: Lock ioeventfd state with VIRTIO_F_NOTIFICATION_DATA

Jonah Palmer posted 8 patches 8 months, 4 weeks ago
Maintainers: Raphael Norwitz <raphael@enfabrica.net>, "Michael S. Tsirkin" <mst@redhat.com>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Jason Wang <jasowang@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Fam Zheng <fam@euphon.net>, Stefan Hajnoczi <stefanha@redhat.com>
There is a newer version of this series
[RFC 6/8] virtio-ccw: Lock ioeventfd state with VIRTIO_F_NOTIFICATION_DATA
Posted by Jonah Palmer 8 months, 4 weeks ago 
Prevent ioeventfd from being enabled/disabled when a virtio-ccw device
has negotiated the VIRTIO_F_NOTIFICATION_DATA transport feature.

Due to the ioeventfd not being able to carry the extra data associated
with this feature, the ioeventfd should be left in a disabled state for
emulated virtio-ccw devices using this feature.

Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
---
 hw/s390x/virtio-ccw.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index b4676909dd..936ba78fda 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -530,14 +530,16 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             if (ret) {
                 break;
             }
-            if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+            if (!(status & VIRTIO_CONFIG_S_DRIVER_OK) &&
+                !virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
                 virtio_ccw_stop_ioeventfd(dev);
             }
             if (virtio_set_status(vdev, status) == 0) {
                 if (vdev->status == 0) {
                     virtio_ccw_reset_virtio(dev);
                 }
-                if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
+                if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
+                    !virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
                     virtio_ccw_start_ioeventfd(dev);
                 }
                 sch->curr_status.scsw.count = ccw.count - sizeof(status);
-- 
2.39.3
Re: [RFC 6/8] virtio-ccw: Lock ioeventfd state with VIRTIO_F_NOTIFICATION_DATA
Posted by Thomas Huth 8 months, 4 weeks ago 
On 01/03/2024 14.43, Jonah Palmer wrote:
> Prevent ioeventfd from being enabled/disabled when a virtio-ccw device
> has negotiated the VIRTIO_F_NOTIFICATION_DATA transport feature.
> 
> Due to the ioeventfd not being able to carry the extra data associated
> with this feature, the ioeventfd should be left in a disabled state for
> emulated virtio-ccw devices using this feature.
> 
> Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
> ---
>   hw/s390x/virtio-ccw.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> index b4676909dd..936ba78fda 100644
> --- a/hw/s390x/virtio-ccw.c
> +++ b/hw/s390x/virtio-ccw.c
> @@ -530,14 +530,16 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
>               if (ret) {
>                   break;
>               }
> -            if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
> +            if (!(status & VIRTIO_CONFIG_S_DRIVER_OK) &&
> +                !virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
>                   virtio_ccw_stop_ioeventfd(dev);
>               }
>               if (virtio_set_status(vdev, status) == 0) {
>                   if (vdev->status == 0) {
>                       virtio_ccw_reset_virtio(dev);
>                   }
> -                if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
> +                if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
> +                    !virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
>                       virtio_ccw_start_ioeventfd(dev);
>                   }
>                   sch->curr_status.scsw.count = ccw.count - sizeof(status);

Acked-by: Thomas Huth <thuth@redhat.com>

Patchew 2.1-devel-b67e4c2

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