Re: [Xen-devel] 2.6.38 (FC15) with PCI passthrough fails mysteriously with iommu=soft..

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Jun 01, 2011 at 02:13:17PM -0400, Konrad Rzeszutek Wilk wrote:
> On Wed, Jun 01, 2011 at 07:32:54PM +0200, Laszlo Ersek wrote:
> > On 06/01/11 16:31, Konrad Rzeszutek Wilk wrote:
> > >On Wed, Jun 01, 2011 at 01:02:02PM +0200, Laszlo Ersek wrote:
> > >>(Perhaps it's best to write a separate mail about this.)
> > >
> > >Yes. You did use 'iommu=soft' on your bootup line right?
> > 
> > I thought I did; turns out I was wrong. Sorry for the noise.
> > 
> > Now I tried with "iommu=soft swiotlb=force", but this way the guest
> 
> You don't need the swiotlb=force. I wonder what page talks about that?
> The Wiki mentions it is only required for older kernels - not the new ones.
> 
> 
> > immediately disappears; it doesn't even start to produce console
> 
> It probably was panicing b/c it couldn't swizzle out 64MB
> of DMA32 memory. You can find that out if you do 'earlyprintk=xenboot' and
> that should print out the bootlog in your Xen debug console (if you have
> configured guest_loglvl=all).
> 
> You can also do 'swiotlb=1024' to lower the amount. .. which should have 
> worked,
> except that I found it does not work - so try this patch:
> 
> https://lkml.org/lkml/2011/6/1/554
> 
> Also, you can set this parameter in you guest file to analyze its stack:
> 
> on_crash="preserve"
> 
> using xenctx.
> 

xenctx usage is described here:
http://wiki.xen.org/xenwiki/XenCommonProblems#head-61843b32f0243b5ad0e17850f9493bffd80f8c17

-- Pasi


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