On Sun, Dec 27, 2020 at 03:46:27PM +0100, Evgeni Golov wrote: > 1. qemu will happily continue booting cirros when you stop tuned *after* > starting qemu > 2. it boots fine if you use the "default" (which is not default anymore, > but a legacy fallback) or the "balanced" profiles. > 3. it hangs as you describe in the "throughput-performance", > "virtual-guest" and "virtual-host" profiles -- I didn't test any others > 4. using any of the problematic profiles on my laptop doesn't make it > freeze in the non-nested case > > Still, not a fix, but at least a direction ;-)
Digging deeper. This doesn't happen on the buster cloud images, and a few "apt install" invocations later I could bisect the issue to be the upgrade of seabios from 1.12.0-1 to 1.14.0-2. I also can't repro this in vagrant (by using the buster64 box and upgrading it fully to testing) with libvirt/qemu as a backend instead of plain qemu. So there seem to be more levels of weirdness to this.
