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xen-devel
Re: [Xen-devel] Re: 2.6.28.7 domU: 32-bit emulation seems to be broken
On 08/10/09 05:59, Christoph Egger wrote:
>> I still notice this problem with vanilla 2.6.30.4 domU under Xen 3.3.2
>> (32 bit binaries on a 64 bit domU kernel segfault, AMD CPU). vdso32=0
>> still helps.
>>
>> Any news?
>>
>
> What does Linux use w/o vdso32=0 on your box ? Does it use sysenter, syscall
> or int 0x80 ?
>
> Do you boot the DomU directly or does this happen after migration from
> an Intel box ?
>
There appears to be a bug in the 64-bit xen_sysret32, which attempts to
take the sysret environment and turn it into an iret hypercall (since
iret is the only way to do a 64-bit kernel -> 32-bit user return).
I don't have an AMD test machine on hand, so I haven't had a chance to
work out what's actually failing. I couldn't see anything wrong by
staring at the code, but that probably means I was either starting hard
at the bug, or looking right next to the bug...
Could you try looking at this?
J
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