[PULL 5/9] pc-bios/s390-ccw/virtio: Add a function to reset a virtio device

[Thomas Huth <thuth@redhat.com>]

To be able to properly silence a virtio device after using it,
we need a global function to reset the device.

Reviewed-by: Jared Rossi <jrossi@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Tested-by: Jared Rossi <jrossi@linux.ibm.com>
Message-ID: <20250116115826.192047-2-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 pc-bios/s390-ccw/virtio.h | 1 +
 pc-bios/s390-ccw/virtio.c | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h
index 9faf3986b1..f13fa6f5fe 100644
--- a/pc-bios/s390-ccw/virtio.h
+++ b/pc-bios/s390-ccw/virtio.h
@@ -274,6 +274,7 @@ void vring_send_buf(VRing *vr, void *p, int len, int flags);
 int vr_poll(VRing *vr);
 int vring_wait_reply(void);
 int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd);
+int virtio_reset(VDev *vdev);
 int virtio_setup_ccw(VDev *vdev);
 
 int virtio_net_init(void *mac_addr);
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 8b5a370bb3..cd6c99c7e3 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -217,6 +217,11 @@ int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd)
     return 0;
 }
 
+int virtio_reset(VDev *vdev)
+{
+    return run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false);
+}
+
 int virtio_setup_ccw(VDev *vdev)
 {
     int i, cfg_size = 0;
@@ -235,7 +240,7 @@ int virtio_setup_ccw(VDev *vdev)
     vdev->config.blk.blk_size = 0; /* mark "illegal" - setup started... */
     vdev->guessed_disk_nature = VIRTIO_GDN_NONE;
 
-    run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false);
+    virtio_reset(vdev);
 
     status = VIRTIO_CONFIG_S_ACKNOWLEDGE;
     if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false)) {
-- 
2.48.1