Re: [Qemu-devel] Re: [PATCH] Reboot CPU on triple fault

[Kevin Wolf]

Michal Schulz schrieb:
> A software which tries to go back from protected to 
> real mode sets the warm-reset vector in BIOS memory area, sets the reboot 
> reason variable in CMOS memory and issues a CPU reset.

Oh, I see. The modification of the BIOS memory area is the piece I
missed. Now this makes much more sense.

Still the questions remains what to do with triple faults wrt logging. I
understand that in 286 PM there might be masses of faults which nobody
is interested in. On the other hand, I'd really hate to have no output
when my code crashes with a triple fault and I haven't enabled -d int.

Maybe we can check if this vector has been modified? If not, the triple
fault certainly wouldn't be an intended usage of a "feature".

Kevin