Re: [PATCH 06/12] hw/xen: add get_frontend_path() method to XenDeviceClass

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On 16/10/2023 16:19, David Woodhouse wrote:
From: David Woodhouse <dwmw@xxxxxxxxxxxx>

The primary Xen console is special. The guest's side is set up for it by
the toolstack automatically and not by the standard PV init sequence.

Accordingly, its *frontend* doesn't appear in …/device/console/0 either;
instead it appears under …/console in the guest's XenStore node.

To allow the Xen console driver to override the frontend path for the
primary console, add a method to the XenDeviceClass which can be used
instead of the standard xen_device_get_frontend_path()

Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
  hw/xen/xen-bus.c         | 10 +++++++++-
  include/hw/xen/xen-bus.h |  2 ++
  2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c
index ece8ec40cd..cc524ed92c 100644
--- a/hw/xen/xen-bus.c
+++ b/hw/xen/xen-bus.c
@@ -711,8 +711,16 @@ static void xen_device_frontend_create(XenDevice *xendev, Error **errp)
  {
      ERRP_GUARD();
      XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
+    XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
- xendev->frontend_path = xen_device_get_frontend_path(xendev);
+    if (xendev_class->get_frontend_path) {
+        xendev->frontend_path = xendev_class->get_frontend_path(xendev, errp);
+        if (!xendev->frontend_path) {
+            return;

I think you need to update errp here to note that you are failing to create the frontend.

  Paul





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