Re: [PATCH] Re: [Xen-ia64-devel] Re: console output in xen.gz

[Alex Williamson <alex.williamson@xxxxxx>]

On Tue, 2007-02-06 at 23:31 +0100, Tristan Gingold wrote:
> On Tue, Feb 06, 2007 at 11:48:00AM -0700, Alex Williamson wrote:
> > On Tue, 2007-02-06 at 06:27 +0100, Tristan Gingold wrote:
> > 
> > > > >(XEN) lookup_domain_mpa: d 0xf000000007af4080 id 1 current 
> > > > >0xf000000007ac8000 i0
> > > > >(XEN) lookup_domain_mpa: bad mpa 0xffffc09e279 (=> 0x1fff4000)
> > > > >(XEN) Warning: UC to WB for mpaddr=ffffc09e279
> > > > >(XEN) lookup_domain_mpa: d 0xf000000007af4080 id 1 current 
> > > > >0xf000000007ac8000 i0
> > > DomU was trying to access lpt2.
> > 
> >    Perhaps we should be less verbose about I/O port space accesses.
> > Unfortunately it's pretty normal for an OS to do some poking in port
> > space.  Something like the patch below would help reduce the noise.
> Just a comment:
> IMHO, domain and vcpu addresses are almost useless.  Message with only
> domain_id=XXX vcpu=YYY will be better.  Also the current IP may be 
> interesting.

   Good idea.  Done.  I also decoded the I/O port address to make things
easier.  The only I/O port access I was seeing on a domU bootup was and
access to 0x64 from i8042_flush(), which is pretty innocuous.

   However, I still get lots of non-I/O port badness if I save and then
restore a domain.  Anyone know where these others are coming from:

(XEN) mm.c:714:d2 vcpu 1 iip 0xa000000100145e50: bad mpa 0x1001f7380 (=> 
0xffff4000)
(XEN) mm.c:714:d2 vcpu 1 iip 0xa000000100145e50: bad mpa 0x10000a960 (=> 
0xffff4000)
(XEN) mm.c:714:d2 vcpu 0 iip 0xe000000000000810: bad mpa 0x1001f3ff8 (=> 
0xffff4000)
(XEN) mm.c:714:d2 vcpu 0 iip 0xe000000000000810: bad mpa 0x1001f6ed0 (=> 
0xffff4000)
(XEN) mm.c:714:d2 vcpu 0 iip 0x20000000000246a0: bad mpa 0x10000a948 (=> 
0xffff4000)
...

The first couple are from fs/exec.c:count().  You have to actually
execute programs in the domain to trigger them.  Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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