On Wed, Sep 08, 2021 at 06:28:01PM +0200, Paolo Bonzini wrote: > On 08/09/21 18:08, Daniel P. Berrangé wrote: > > Despite this difference, I was able migrate from a x86 guest using SGA > > to a guest using graphics=off without errors being reported. So it > > doesn't seem to change the migration data sections sent on the wire > > at least. > > It would probably break with Windows XP/2003 guests on AMD processors, as > those are the ones that use kvmvapic. On other guests and processors, it's > a no-op.
After running an incoming migrate, the target QEMU's 'info mtree' changed to reflect what the src QEMU originally reported. So whatever difference 'graphics=off' causes compared to -device sga initially, appears to have been eliminated by running the migrate. Not sure if that's true in the general case or not - I'm just testing with a minimalist CLI and no real OS running qemu-system-x86_64 -nodefaults -display sdl -device VGA -serial stdio -device sga vs qemu-system-x86_64 -nodefaults -display sdl -device VGA -serial stdio -machine graphics=off 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 :|
