On 12/10/2012 05:37 PM, Gerd Hoffmann wrote:
Hi,
For backwards compatibility, if a certain qemu version does not support one of the above video device arguments to -device or even -device itself, the -vga will still be used. That will not work. You must check the qemu version. 1.2+ is safe, IIRC 1.1 will work too.
Technical background: '-device VGA' (+variants) exists for a looooooong time, pretty much day one of the -device switch. Actually using it did not work though due to a nasty initialization order issue in qemu. The qemu memory api created by avi fixed it.
cheers, Gerd
Okay, if so, I prefer 1.2+ to ensure -device VGA work as expected. A question here, all of these four vga device (VGA, cirrus-vga, vmware-svga, qxl-vga) has existed and been supported since 1.2 QEMU version, is it right? If so, libvirt doesn't need to check for them individually. Guannan