Hi Pavel, I have to apologize. After your post I study the page again and I found your descrption. Best regards, Am 14.03.2016 um 10:20 schrieb Pavel Hrdina: On Mon, Mar 14, 2016 at 09:41:36AM +0100, Holger Schranz wrote: > Hi Luo, > > the vgamem is limited inside. Myself, I use QEMU 2.5/Virgil3D to expand > the vgamem. It's not limited and can be modified inside the xml, the only limitation is that the value has to be a power of 2 and for QXL the value must be at least 1024. There is an exception, qemu can and in some cases updates the value internally, libvirt after the guest is started will get the actual value from qemu and update live XML. Pavel