[SeaBIOS] [QUESTION]stuck in SeaBIOS and vm can not be reset any more

[Kevin O'Connor]

On Tue, Aug 02, 2016 at 04:18:30AM +0000, Xulei (Stone) wrote:
> >On Fri, Jul 29, 2016 at 04:04:59AM +0000, Xulei (Stone) wrote:
> >> After one day, the vm is stuck. Looking from the following seabios log,
> >> it seems seabios stops at "PCI: Using 00:02.0 for primary VGA", and can
> >> not execute handle_smp() any more.
> >> What may be the reason?
> >
> >More debugging info would be necessary to find this problem.  You
> >could try reproducing and attaching gdb (
> >http://www.seabios.org/Debugging#Debugging_with_gdb_on_QEMU ).
> >Alternatively, a kvm trace log may help.
> >
> kvm trace (seems useful) indicates that cpu 0 keeps always to access 0x00b3 ioport.
> 0x00b3 is PORT_SMI_STATUS, so i guess my bios is stuck in the function
> smm_relocate_and_restore
> { 
> 	...
> 	/* wait until SMM code executed */
>     while (inb(PORT_SMI_STATUS) != 0x00)
> 	...
> }

I'd try adding dprintf() statements around all the code at the top of
smm_relocate_and_restore() and enable the dprintf() at the top of
handle_smi().

It would also be useful if you can extract the log from the last
two working reboots to compare it to the failed case.

-Kevin