If the vhost-user-scsi backend supports the VHOST_USER_F_RESET_DEVICE
protocol feature, then the device can be reset when requested.
If this feature is not supported, do not try a reset as this will send
a VHOST_USER_RESET_OWNER that the backend is not expecting,
potentially putting into an inoperable state.
Signed-off-by: David Vrabel <david.vra...@nutanix.com>
---
hw/scsi/vhost-user-scsi.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c
index 9389ed48e0..15e2dabebb 100644
--- a/hw/scsi/vhost-user-scsi.c
+++ b/hw/scsi/vhost-user-scsi.c
@@ -37,6 +37,10 @@ static const int user_feature_bits[] = {
VHOST_INVALID_FEATURE_BIT
};
+enum VhostUserProtocolFeature {
+ VHOST_USER_PROTOCOL_F_RESET_DEVICE = 8,
+};
+
static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status)
{
VHostUserSCSI *s = (VHostUserSCSI *)vdev;
@@ -60,6 +64,25 @@ static void vhost_user_scsi_set_status(VirtIODevice *vdev,
uint8_t status)
}
}
+static void vhost_user_scsi_reset(VirtIODevice *vdev)
+{
+ VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
+ struct vhost_dev *dev = &vsc->dev;
+
+ /*
+ * Historically, reset was not implemented so only reset devices
+ * that are expecting it.
+ */
+ if (!virtio_has_feature(dev->protocol_features,
+ VHOST_USER_PROTOCOL_F_RESET_DEVICE)) {
+ return;
+ }
+
+ if (dev->vhost_ops->vhost_reset_device) {
+ dev->vhost_ops->vhost_reset_device(dev);
+ }
+}
+
static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
}
@@ -172,6 +195,7 @@ static void vhost_user_scsi_class_init(ObjectClass *klass,
void *data)
vdc->get_features = vhost_user_scsi_get_features;
vdc->set_config = vhost_scsi_common_set_config;
vdc->set_status = vhost_user_scsi_set_status;
+ vdc->reset = vhost_user_scsi_reset;
fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path;
}
--
2.11.0
