Re: [Xen-devel] PTE Write access is not set

[Keir Fraser <keir@xxxxxxx>]

On 14/12/2011 09:36, "Ian Campbell" <Ian.Campbell@xxxxxxxxxx> wrote:

> On Wed, 2011-12-14 at 08:05 +0000, Liwei wrote:
>> Hello list,
>>     Using the 3.1.5 kernel and 4.1.3-rc1-pre xen (Latest ChangeSet:
>> Tue Dec 06 10:53:12 2011 +0000 23199:d9f8316a8291), these crashes
>> occur after about a day or so of running a HVM:
>> =================8<=================
>> (XEN) realmode.c:115:d9 Failed to emulate insn.
>> (XEN) realmode.c:165:d9 Real-mode emulation failed @ e40a:00005f6c: d9
>> 33 01 fc 30 34
> 
> I think this is FNSTENV/FSTENV which doesn't seem to be emulated by
> Xen :-( xen/arch/x86/x86_emulate/x86_emulate.c has:
>                  /* case 6: fstenv - TODO */

I wonder why a long-running HVM guest would be in real mode executing FP
code. That seems a bit fishy.

 -- Keir



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