[SeaBIOS] Real mode kexec failure with non-IDE disk

David Woodhouse dwmw2 at infradead.org
Wed May 1 13:16:03 PDT 2019


On Tue, 2019-04-30 at 22:56 -0400, Kevin O'Connor wrote:
> Hi David,
> 
> That call trace certainly looks odd.  The SeaBIOS debugging info would
> help - try compiling SeaBIOS with debug level 8 and grab the log (as
> described at: https://www.seabios.org/Debugging#Diagnostic_information
> ).

Choosing Xen because it actually succeeds, while Linux real-mode boot
then dies a bit later even if I use IDE disks...

This SeaBIOS git master (f4c6e4c1) with an IDE disk, from the moment of
kexec:

unimplemented handle_15XX:330:
   a=0000ec00  b=00000002  c=00000000  d=00000000 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000000 bp=00000000 sp=0000fe8e cs=8f00 ip=0060  f=0246
enter handle_12:
   a=534d3c00  b=0000befe  c=00003c00  d=002ffb80 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000af1 bp=00000000 sp=0000fe8e cs=8f00 ip=0143  f=0202
invalid handle_legacy_disk:729:
   a=534d4139  b=000055aa  c=0000fe03  d=002ffb81 ds=8f00 es=8f00 ss=d980
  si=00001539 di=00000000 bp=00000000 sp=0000fe8e cs=8f00 ip=015b  f=0293
invalid handle_legacy_disk:729:
   a=534d0201  b=00000000  c=889f0001  d=002f0081 ds=8f00 es=8ee0 ss=d980
  si=0000aa55 di=00000000 bp=00000000 sp=0000fe8e cs=8f00 ip=0202  f=0247
 Xen 4.11.2-pre
(XEN) Xen version 4.11.2-pre (dwmw at ant.amazon.com) (gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0) debug=n  Wed May  1 22:08:39 IDT 2019
(XEN) Latest ChangeSet: Wed May 1 13:37:09 2019 +0300 git:7c281700a8
(XEN) Bootloader: kexec 2.0.19.git
(XEN) Command line: console=vga,com1
(XEN) Xen image load base address: 0
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN) Disc information:
(XEN)  Found 1 MBR signatures
(XEN)  Found 1 EDD information structures

And this is all I see when the disk is virtio:

unimplemented handle_15XX:330:
   a=0000ec00  b=00000002  c=00000000  d=00000000 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000000 bp=00000000 sp=0000fe8e cs=8f00 ip=0060  f=0246
enter handle_12:
   a=534d3c00  b=0000befd  c=00003c00  d=002ffb40 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000af1 bp=00000000 sp=0000fe8e cs=8f00 ip=0143  f=0202
invalid handle_legacy_disk:729:
   a=534d4139  b=000055aa  c=0000fe03  d=002ffb81 ds=8f00 es=8f00 ss=d980
  si=00001539 di=00000000 bp=00000000 sp=0000fe8e cs=8f00 ip=015b  f=0293

Increasing debug to 9, I see:

enter handle_15:
   a=0000ec00  b=00000002  c=00000000  d=00000000 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000000 bp=00000000 sp=0000f96e cs=8f00 ip=0060  f=0246
unimplemented handle_15XX:330:
   a=0000ec00  b=00000002  c=00000000  d=00000000 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000000 bp=00000000 sp=0000f96e cs=8f00 ip=0060  f=0246
enter handle_15:
   a=0000e820  b=00000000  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000a51 bp=00000000 sp=0000f96e cs=8f00 ip=00ec  f=0246
enter handle_15:
   a=0000e820  b=00000001  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000a65 bp=00000000 sp=0000f96e cs=8f00 ip=00ec  f=0202
enter handle_15:
   a=0000e820  b=00000002  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000a79 bp=00000000 sp=0000f96e cs=8f00 ip=00ec  f=0202
enter handle_15:
   a=0000e820  b=00000003  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000a8d bp=00000000 sp=0000f96e cs=8f00 ip=00ec  f=0206
enter handle_15:
   a=0000e820  b=00000004  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000aa1 bp=00000000 sp=0000f96e cs=8f00 ip=00ec  f=0202
enter handle_15:
   a=0000e820  b=00000005  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000ab5 bp=00000000 sp=0000f96e cs=8f00 ip=00ec  f=0206
enter handle_15:
   a=0000e820  b=00000006  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000ac9 bp=00000000 sp=0000f96e cs=8f00 ip=00ec  f=0206
enter handle_15:
   a=0000e820  b=00000007  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000add bp=00000000 sp=0000f96e cs=8f00 ip=00ec  f=0202
enter handle_15:
   a=534d88f1  b=00000000  c=00000014  d=534d4150 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000af1 bp=00000000 sp=0000f96e cs=8f00 ip=0112  f=0246
enter handle_15:
   a=534de801  b=00000000  c=00000000  d=534d0000 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000af1 bp=00000000 sp=0000f96e cs=8f00 ip=011f  f=0246
enter handle_12:
   a=534d3c00  b=0000befd  c=00003c00  d=002ffb40 ds=8f00 es=8f00 ss=d980
  si=00000000 di=00000af1 bp=00000000 sp=0000f96e cs=8f00 ip=0143  f=0202
invalid handle_legacy_disk:729:
   a=534d4139  b=000055aa  c=0000fe03  d=002ffb81 ds=8f00 es=8f00 ss=d980
  si=00001539 di=00000000 bp=00000000 sp=0000f96e cs=8f00 ip=015b  f=0293
call32_smm 0x000ed91a e9120
handle_smi cmd=b5 smbase=0x000a0000
vp notify fe003000 (2) -- 0x0
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
handle_smi cmd=b5 smbase=0x000a0000
handle_smi cmd=b5 smbase=0x000a0000
call16_smm 0x00007a79 0 0
... 

That just goes on for ever. The full log from boot (including the boot
of the first kernel) is at http://david.woodhou.se/smi-wtf.txt


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