[PATCH v3 18/28] hw/xen: only remove peers of PCI NICs on unplug

David Woodhouse
2023-10-25T14:51:39Z

From: David Woodhouse <dwmw@amazon.co.uk>

When the Xen guest asks to unplug *emulated* NICs, it's kind of unhelpful
also to unplug the peer of the *Xen* PV NIC.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
hw/i386/xen/xen_platform.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/i386/xen/xen_platform.c b/hw/i386/xen/xen_platform.c
index 17457ff3de..e2dd1b536a 100644
--- a/hw/i386/xen/xen_platform.c
+++ b/hw/i386/xen/xen_platform.c
@@ -140,9 +140,14 @@ static void unplug_nic(PCIBus *b, PCIDevice *d, void *o)
/* Remove the peer of the NIC device. Normally, this would be a tap device. */
static void del_nic_peer(NICState *nic, void *opaque)
{
- NetClientState *nc;
+ NetClientState *nc = qemu_get_queue(nic);
+ ObjectClass *klass = module_object_class_by_name(nc->model);
+
+ /* Only delete peers of PCI NICs that we're about to delete */
+ if (!klass || !object_class_dynamic_cast(klass, TYPE_PCI_DEVICE)) {
+ return;
+ }

- nc = qemu_get_queue(nic);
if (nc->peer)
qemu_del_net_client(nc->peer);
}
--
2.40.1