On 14 August 2012 19:53, Anthony Liguori [off-list ref] wrote:

Forget about !x86 platforms.  They have their own way to do this sort of
thing.  Think of this feature like a status LED on a motherboard.  These
are very common and usually controlled by IO ports.

Please don't forget !x86 platforms, we are cute and loveable really :-)

We're simply reserving a "status LED" for the guest to indicate that it
has paniced.  Let's not over engineer this.

...not that QEMU actually has any kind of "front panel lights and switches"
interface at all, it might be nice to have one. I bet a lot of the embedded
boards have function DIP switches, heartbeat LEDs, etc etc...

-- PMM