Changes to a virtio network device such as <interface type="network"> <model type="virtio"/> <driver iommu="on" ats="on"/> <!-- this line added --> ... </interface> were quietly dismissed by `virsh update-device ... --live`. Signed-off-by: Tim Wiederhake <twiederh(a)redhat.com&gt; Reviewed-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- src/qemu/qemu_hotplug.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 57635cd419..6371d53871 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -3600,6 +3600,16 @@ qemuDomainChangeNet(virQEMUDriverPtr driver, goto cleanup; } + if (!!olddev->virtio != !!newdev->virtio || + (olddev->virtio && newdev->virtio && + (olddev->virtio->iommu != newdev->virtio->iommu || + olddev->virtio->ats != newdev->virtio->ats || + olddev->virtio->packed != newdev->virtio->packed))) { + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s", + _("cannot modify virtio network device driver options")); + goto cleanup; + } + /* data: this union will be examined later, after allocating new actualdev */ /* virtPortProfile: will be examined later, after allocating new actualdev */ -- 2.26.2