Re: Etherboot problems

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Simon Kagstrom wrote:
> Hello!
>
> I'm trying to get etherboot running with KVM (version 2 from today),
> but have been unsucessful so far. It works well in plain qemu, but not
> with KVM.
>
> I'm running etherboot 5.4.2, ROM rtl8139:rtl8139 [0x10ec,0x8139] built
> as a "ISO bootable image without legacy floppy emulation (.iso)" on
> http://rom-o-matic.net/5.4.2/. When I run it I get
>
>    $ qemu-system-x86_64 -cdrom ~/eb-rtl8139.iso
>    ...
>    unhandled vm exit:  0x2
>    rax 0000000060000011 rbx 0000000000000e51 rcx 0000000000000000 rdx 0000000000000000
>    rsi 0000000000106347 rdi 0000000000016347 rsp 0000000000008fbe rbp 0000000000098fbe
>    r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 0000000000000000
>    r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 0000000000000000
>    rip 0000000000000e8a rflags 00010006
>    Aborted
>
> . From browsing the Xen sources, I think the VM exit 0x2 is a
> triple-fault. I've disassembled the .iso with hte, and the code that
> runs last is
>
>    ...
>    00000e75 660fb7ec                       movzx       ebp, sp
>    00000e79 6601c5                         add         ebp, eax            
>    00000e7c 660f01975200                   lgdt        single ptr [bx+0x52]
>    00000e82 0f20c0                         mov         eax, cr0
>    00000e85 0c01                           or          al, 0x1
>    00000e87 0f22c0                         mov         cr0, eax
>    00000e8a 66ffaf6a00                     jmp         far ptr [bx+0x6a]
>    ...
>
> I'm not an expert on Intel-syntax 16-bit assembly, but I guess the
> last instruction is something like
>
>    jmp  *0x6a(%bx)
>
> . One thing which I'm sure of is if the vm exit was caused by the move
> to %cr0 or the jump.
>
> Any takes? I can supply the .iso if someone would like to play with it
>   

I've generated the .iso (nice interface) and will try to reproduce it.

Thanks for testing -- we really need those wierd guests to test the 
corner cases.


-- 
error compiling committee.c: too many arguments to function


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