[PULL 18/25] vfio-user: implement VFIO_USER_DEVICE_RESET

["Cédric Le Goater" <clg@redhat.com>]

From: John Levon <john.levon@nutanix.com>

Hook this call up to the legacy reset handler for vfio-user-pci.

Originally-by: John Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-13-john.levon@nutanix.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
 hw/vfio-user/device.h |  2 ++
 hw/vfio-user/device.c | 18 ++++++++++++++++++
 hw/vfio-user/pci.c    | 15 +++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/hw/vfio-user/device.h b/hw/vfio-user/device.h
index 619c0f3140650599f930eddeb6d8a4a9ebf10b97..d183a3950e26ea1defac870509265cdfe57a4026 100644
--- a/hw/vfio-user/device.h
+++ b/hw/vfio-user/device.h
@@ -17,6 +17,8 @@
 bool vfio_user_get_device_info(VFIOUserProxy *proxy,
                                struct vfio_device_info *info, Error **errp);
 
+void vfio_user_device_reset(VFIOUserProxy *proxy);
+
 extern VFIODeviceIOOps vfio_user_device_io_ops_sock;
 
 #endif /* VFIO_USER_DEVICE_H */
diff --git a/hw/vfio-user/device.c b/hw/vfio-user/device.c
index f01b3925c5a5a22cd8f55303d48b36d9dface54c..3a118e73615a40d5d455dfb379115be66726627a 100644
--- a/hw/vfio-user/device.c
+++ b/hw/vfio-user/device.c
@@ -54,6 +54,24 @@ bool vfio_user_get_device_info(VFIOUserProxy *proxy,
     return true;
 }
 
+void vfio_user_device_reset(VFIOUserProxy *proxy)
+{
+    Error *local_err = NULL;
+    VFIOUserHdr hdr;
+
+    vfio_user_request_msg(&hdr, VFIO_USER_DEVICE_RESET, sizeof(hdr), 0);
+
+    if (!vfio_user_send_wait(proxy, &hdr, NULL, 0, &local_err)) {
+        error_prepend(&local_err, "%s: ", __func__);
+        error_report_err(local_err);
+        return;
+    }
+
+    if (hdr.flags & VFIO_USER_ERROR) {
+        error_printf("reset reply error %d\n", hdr.error_reply);
+    }
+}
+
 static int vfio_user_get_region_info(VFIOUserProxy *proxy,
                                      struct vfio_region_info *info,
                                      VFIOUserFDs *fds)
diff --git a/hw/vfio-user/pci.c b/hw/vfio-user/pci.c
index c0f00f15b10a80820606ff4ef0383d59ecd91670..49d12763aba73f780ec5b202dfd4d3dc98837491 100644
--- a/hw/vfio-user/pci.c
+++ b/hw/vfio-user/pci.c
@@ -263,6 +263,20 @@ static void vfio_user_instance_finalize(Object *obj)
     }
 }
 
+static void vfio_user_pci_reset(DeviceState *dev)
+{
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(dev);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+
+    vfio_pci_pre_reset(vdev);
+
+    if (vbasedev->reset_works) {
+        vfio_user_device_reset(vbasedev->proxy);
+    }
+
+    vfio_pci_post_reset(vdev);
+}
+
 static const Property vfio_user_pci_dev_properties[] = {
     DEFINE_PROP_UINT32("x-pci-vendor-id", VFIOPCIDevice,
                        vendor_id, PCI_ANY_ID),
@@ -310,6 +324,7 @@ static void vfio_user_pci_dev_class_init(ObjectClass *klass, const void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
 
+    device_class_set_legacy_reset(dc, vfio_user_pci_reset);
     device_class_set_props(dc, vfio_user_pci_dev_properties);
 
     object_class_property_add(klass, "socket", "SocketAddress", NULL,
-- 
2.49.0