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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2009-12-22 at 14:35 +0000, Konrad Rzeszutek Wilk wrote:
> On Tue, Dec 22, 2009 at 09:20:15AM +0000, Ian Campbell wrote:
> > On Tue, 2009-12-22 at 08:42 +0000, Pasi Kärkkäinen wrote:
> > > >    (early) [    0.000000] PCI-DMA: Using Xen software bounce
> > > buffering for IO
> > > >    (Xen-SWIOTLB)
> > > >    (early) [    0.000000] Kernel panic - not syncing:
> > > >    <3>xen_create_contiguous_region failed
> > > > 
> > > 
> > > Did you try cgroup_disable=memory kernel option? 
> > 
> > I think this is more likely to relate to the failure to initialise
> > swiotlb due to the failure of xen_create_contiguous_region, leading to a
> > panic. IIRC the guest won't be privileged enough to make this call
> > unless it has PCI passthrough enabled.
> 
> Not so. You can still make the call even if you don't have PCI passthrough
> enabled. The up call is just to replace MFNs.

I thought it used to be that you could only (successfully) make order>0
increase_reservation or mem_exchange hypercalls if you had I/O
privileges? Has this changed?

Ian.



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