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

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Roger Pau Monné [mailto:roger.pau@xxxxxxxxxx]
> Sent: 31 July 2015 12:42
> To: Paul Durrant; Sander Eikelenboom
> Cc: Andrew Cooper; xen-devel
> Subject: Re: [Xen-devel] [BUG] Emulation issues
> 
> 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.
> 

Thanks. That would be very helpful. I will continue to try to repro.

  Paul

> Roger.


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