Re: [Xen-devel] I cannot get any message from domU by console / pv_ops domU kernel crashes with xen_create_contiguous_region failed

[Michael D Labriola <mlabriol@xxxxxxxx>]

xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 12/22/2009 11:44:23 AM:

> > Maybe Xen 3.4.2 logic is much different than 4.0 when it comes to 
> > exchanging MFNs
> > and Ian's is right. Under 4.0 it I've no trouble exchanging the MFNs
> > even without
> > any PCI devices being passed in.
> > 
> > Can you try this patch to help narrow down the problem:
> > 
> > diff --git a/arch/x86/xen/pci-swiotlb.c b/arch/x86/xen/pci-swiotlb.c
> > index ecdbfe2..37fd0e3 100644
> > --- a/arch/x86/xen/pci-swiotlb.c
> > +++ b/arch/x86/xen/pci-swiotlb.c
> > @@ -960,7 +960,7 @@ xen_swiotlb_fixup(void *buf, size_t size, 
> > unsigned long nslabs)
> >              dma_bits);
> >        } while (rc && dma_bits++ < max_dma_bits);
> >        if (rc)
> > -         panic(KERN_ERR "xen_create_contiguous_region failed\n");
> > +         panic(KERN_ERR "xen_create_contiguous_region failed: rc: 
> %d\n", rc);
> > 
> >        i += slabs;
> >     } while(i < nslabs);
> > 
> > And also ensure that your command line for Xen has: console=com1,vga
> > guest_loglvl=all
> 
> Made that change and tried again.  rc was -12.  Do you need the whole 
> dump?  I'm not really sure how to capture it...

Trying to attach the domU console output such that Lotus Notes doesn't 
garble it all... bare with me.  ;-)

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