On Wed, Mar 19, 2025 at 02:03:09PM +0100, Gerd Hoffmann wrote: > Hi, > > > > > > There is 'stateless' already for 'firmware image in r/o flash'. > > > > > > > > What's the behaviour of UEFI if build with JSON vars support, but > > > > without > > > > QEMU providing any JSON vars backend ? > > > > > > It will panic. > > > > In that case, we must not reuse 'stateless' with such builds, as that's > > quite different semantics & incompatible with current usage. > > > > We would need a new 'uefi-vars' mode, or just declare that we must > > always use 'memory' not 'flash' for such builds. > > I don't see how 'flash.stateless' is any different than 'memory' (or > 'kernel', or maybe 'igvm' some day). If the 'host-uefi-vars' feature > is present '-device uefi-vars-$kind' is required, no matter how you > load the firmware. > > What exactly will an old libvirt which does not know the > 'host-uefi-vars' feature do in case it finds a firmware.json file with > that feature? Play safe and ignore the file?
No, unknown features are simply ignored. With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
