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

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

El 31/07/15 a les 13.39, Paul Durrant ha escrit:
>> -----Original Message-----
>> From: Sander Eikelenboom [mailto:linux@xxxxxxxxxxxxxx]
>> Sent: 31 July 2015 12:12
>> To: Paul Durrant
>> Cc: Andrew Cooper; Roger Pau Monne; xen-devel
>> Subject: Re: [Xen-devel] [BUG] Emulation issues
>>
>>
>> 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.
>>

Since I can reproduce this at will I will attempt to perform a
bisection. Maybe this can help narrow down the issue.

Roger.


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