Re: [Xen-devel] [BUG] Emulation issues

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

El 31/07/15 a les 13.11, Sander Eikelenboom ha escrit:
> 
> Friday, July 31, 2015, 12:22:16 PM, you wrote:
> 
>>> -----Original Message-----
>>> From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
>>> bounces@xxxxxxxxxxxxx] On Behalf Of Paul Durrant
>>> Sent: 30 July 2015 14:20
>>> To: Andrew Cooper; Roger Pau Monne; xen-devel
>>> Subject: Re: [Xen-devel] [BUG] Emulation issues
>>>
>>>> -----Original Message-----
>>>> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
>>>> Sent: 30 July 2015 14:19
>>>> To: Paul Durrant; Roger Pau Monne; xen-devel
>>>> Subject: Re: [BUG] Emulation issues
>>>>
>>>> On 30/07/15 14:12, Paul Durrant wrote:
>>>>>> (XEN) io.c:165:d19v0 Weird HVM ioemulation status 1.
>>>>>> (XEN) domain_crash called from io.c:166
>>>>>> (XEN) d19v0 weird emulation state 1
>>>>>> (XEN) io.c:165:d19v0 Weird HVM ioemulation status 1.
>>>>>> (XEN) domain_crash called from io.c:166
>>>>>> (XEN) d19v0 weird emulation state 1
>>>>>> (XEN) io.c:165:d19v0 Weird HVM ioemulation status 1.
>>>>>> (XEN) domain_crash called from io.c:166
>>>>>>
>>>>> Hmm. Can't understand how that's happening... handle_pio() shouldn't
>>> be
>>>> called unless the state is STATE_IORESP_READY and yet the inner function
>>> is
>>>> hitting the default case in the switch.
>>>>
>>>> Sounds like something is changing the state between the two checks.  Is
>>>> this shared memory writeable by qemu?
>>>>
>>>
>>> No, this is the internal state. I really can't see how it's being changed.
>>>
> 
>> I've tried to replicate your test on my rig (which is an old AMD box but 
>> quite a big one). Even so I only seem to get about half the VMs to start. 
>> The shutdown works fine, and I don't see any problems on the Xen console. 
>> I'm using an older build of Xen but still one with my series in. I'll try 
>> pulling up to the same commit as you and try again.
> 
>>   Paul
> 
> Hi Paul,
> 
>>From what i recall it started around when Tiejun Chen's series went in.

FWIW I've seen this on an Intel box with a Xeon W3550. I have not tried
to reproduce it on any of my other boxes, but I could give it a try if
needed.

Roger.


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