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

Kevin O'Connor kevin at koconnor.net
Tue Aug 2 16:51:12 CEST 2016

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

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


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