[Xen-devel] Re: Crash when booting 32-bit kernel with pvgrub

[Christian Tramnitz <chris.ace@xxxxxxx>]

Not sure if this is the actual cause of the problem but since you didn't 
mention it explicitly: Did you build a separate 32bit pvgrub?
pvgrub does not support 32bit/64bit switching so if you need to change 
architectures you need to compile another version of it...
Best regards,
   Christian

Jeremy Fitzhardinge wrote:
> I'm trying to boot a 32-bit PV guest on a 64-bit xen+dom0 system, and it
> crashes as soon as I select a kernel:
>
>
>   Booting 'Fedora (2.6.27.19-170.2.35.fc10.i686.PAE)'
>
> root (hd0,0)
> Error ENOENT when reading the backend path device/vkbd/0/backend
> Page fault at linear address 0x1c, eip 0x4b6ee, regs 0xb4ff7c, sp 0xb4fff0, 
> our_sp 0xb4ff50, code 2
> Thread: kbdfront
> EIP: 4b6ee, EFLAGS 10002.
> EBX: 746f6f72 ECX: 00000013 EDX: 00000000
> ESI: 00b3fe98 EDI: 00000001 EBP: 00b4ffb0 EAX: 00000000
> DS: c2c2e021 ES: e021 orig_eax: ffffffff, eip: 0004b6ee
> CS: 1e019 EFLAGS: 00010002 esp: 00b4fff0 ss: 37eb
> base is 0xb4ffb0 caller is 0x37eb
> base is 0xb4fff0 caller is 0x31ad
>
> b4ffe0: c2 c2 c2 c2 8f 37 00 00 90 05 00 00 40 20 00 98
> b4fff0: 00 00 00 00 ad 31 00 00 94 fe b3 00 00 00 00 00
> b50000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> b50010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> b4ffa0: ff ff ff ff ee b6 04 00 19 e0 01 00 02 00 01 00
> b4ffb0: f0 ff b4 00 eb 37 00 00 00 00 00 00 01 00 00 00
> b4ffc0: c2 c2 c2 c2 c2 c2 c2 c2 c2 c2 c2 c2 c2 c2 c2 c2
> b4ffd0: c2 c2 c2 c2 c2 c2 c2 00 c2 c2 c2 c2 c2 c2 c2 c2
>
> 4b6d0: e5 8b 45 08 c7 40 1c 00 00 00 00 c7 40 20 00 00
> 4b6e0: 00 00 83 60 18 fe 5d c3 55 89 e5 8b 45 08 c7 40
> 4b6f0: 1c 00 00 00 00 c7 40 20 00 00 00 00 83 48 18 01
> 4b700: 5d c3 55 89 e5 53 83 ec 14 a1 e0 e1 94 00 8b 58
> Pagetable walk from virt 1c, base 9d7000:
>   L3 = 0000000032520027 (0x9d8000)  [offset = 0]
>    L2 = 000000003251e067 (0x9da000)  [offset = 0]
>     L1 = 0000000000000000 [offset = 0]
>
>
> Any clues?
>
> Thanks,
>         J
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