From: Laine Stump <laine@redhat.com> When support for vhostuser devices was added, it was just blanket-prevented from making any changes to a live device with update-device. This is problematic because the link state of a network device is modified with update-device. Most all of the parameters of a vhostuser network device are individually checked within qemuDomainChangeNet() anyway, so we don't need to just do a BRS (Big Red Switch) forbidding of any change. We do need to check for modifications to the socket parameters (path, type, reconnect) though, since those are vhostuser-specific (we're not already checking for them elsewhere) and they can't be changed on a live interface. Resolves https://redhat.atlassian.net/browse/RHEL-152533 Resolves: https://bugs.passt.top/show_bug.cgi?id=198 Signed-off-by: Laine Stump <laine@redhat.com> --- src/qemu/qemu_hotplug.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 7ab28bed6d..e33ef5e1e9 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -4129,6 +4129,24 @@ qemuDomainChangeNet(virQEMUDriver *driver, break; case VIR_DOMAIN_NET_TYPE_VHOSTUSER: + /* the path the to vhostuser socket and its parameters + * can't be changed. In the case of a PASST backend using + * vhostuser, all of those parameters are internally + * generated anyway, so the user wouldn't be able to + * specify them in the updated XML. + */ + if (newdev->backend.type != VIR_DOMAIN_NET_BACKEND_PASST && + (STRNEQ_NULLABLE(olddev->data.vhostuser->data.nix.path, newdev->data.vhostuser->data.nix.path) || + olddev->data.vhostuser->data.nix.listen != newdev->data.vhostuser->data.nix.listen || + olddev->data.vhostuser->data.nix.reconnect.enabled != newdev->data.vhostuser->data.nix.reconnect.enabled || + olddev->data.vhostuser->data.nix.reconnect.timeout != newdev->data.vhostuser->data.nix.reconnect.timeout)) { + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, + _("unable to change socket config on '%1$s' network type"), + virDomainNetTypeToString(newdev->type)); + goto cleanup; + } + break; + case VIR_DOMAIN_NET_TYPE_HOSTDEV: case VIR_DOMAIN_NET_TYPE_VDPA: case VIR_DOMAIN_NET_TYPE_NULL: -- 2.53.0