Re: [libvirt] [PATCH] qemuDomainChangeGraphics: Check listen address change by listen type

Currently, we have a bug when updating a graphics device. A graphics device can have a listen address set. This address is either defined by user (in which case it's type is VIR_DOMAIN_GRAPHICS_LISTEN_TYPE_ADDRESS) or it can be inherited from a network (in which case it's type is VIR_DOMAIN_GRAPHICS_LISTEN_TYPE_NETWORK). However, in both cases we have a listen address to process (e.g. during migration, as I've tried to fix in 7f15ebc7). Later, when an user tries to update the graphics device (e.g. set a password), we check if listen addresses match the original as qemu doesn't know how to change listen address yet. Hence, users are required to not change the listen address. The implementation then just dumps listen addresses and compare them. Previously, while dumping the listen addresses, NULL was returned for NETWORK. After my patch, this is no longer true, and we get a listen address for olddev even if it is a type of NETWORK. So we have a real string on one side, the NULL from user's XML on the other side and hence we think user wants to change the listen address and we refuse it. Therefore, we must take the type of listen address into account as well. --- src/qemu/qemu_hotplug.c | 71 +++++++++++++++++++++++++++++++------------------ 1 file changed, 45 insertions(+), 26 deletions(-) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 6c07af5..8563457 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -1971,10 +1970,50 @@ qemuDomainChangeGraphics(virQEMUDriverPtr driver,

+ switch (listen->type) { + case VIR_DOMAIN_GRAPHICS_LISTEN_TYPE_ADDRESS: + if (STRNEQ_NULLABLE(listen->address, oldlisten->address)) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + dev->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC ? + _("cannot change listen address setting on vnc graphics") : + _("cannot change listen address setting on spice graphics")); + goto cleanup; + } + break; + + case VIR_DOMAIN_GRAPHICS_LISTEN_TYPE_NETWORK: + if (STRNEQ_NULLABLE(listen->network, oldlisten->network)) { + virReportError(VIR_ERR_INVALID_ARG, "%s", + dev->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC ? + _("cannot change listen network setting on vnc graphics") : + _("cannot change listen network setting on spice graphics")); + goto cleanup; + } + break; + + default: + virReportError(VIR_ERR_INTERNAL_ERROR, + _("listen of type %d not handled yet"), + listen->type); + goto cleanup;