Re: [BUG] Emulation issues

["Roger Pau Monné" <roger.pau@citrix.com>]

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@lists.xen.org [mailto:xen-devel-
>>> bounces@lists.xen.org] 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@citrix.com]
>>>> 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.