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Re: [Xen-users] Re: About swiotlb and " ...PCI-DMA: Out ofSW-IOMMU..."er

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Subject: Re: [Xen-users] Re: About swiotlb and " ...PCI-DMA: Out ofSW-IOMMU..."error
From: Stephan Seitz <s.seitz@xxxxxxxxxxxx>
Date: Sun, 09 Dec 2007 14:51:18 +0000
Cc: frankabel@xxxxxxxxxxxxxxxxxx, "Shaun R." <mailinglists@xxxxxxxxxxxxxxxx>, ma.schuster@xxxxxx
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as i'm going to install a bunch of new servers with xen 3.1.2, i'm really
interested in which setup this Out of SW-IOMMU error occurs.

Recent posts on xen-devel and xen-user are not really clear about the used
hardware, the xen version and the dom0 kernel.

To collect some statements:
- It occurs when using 3ware controller on xen 3.1.2 with bundled 2.6.18
- It occurs when using more than 2 G Ram (in dom0 ?)
- It has to do with the used memory model (maybe only on 64bit xen ?)
- One could ommit the error by limiting dom0 max_mem
- It occurs when a pciback.hide()/pci=[] routed physical device is used
  by buggy domU drivers (seen on the list w/. Infiniband card)

My favorite installation would be xen 3.1.2 64bit w/ bundled (and slightly
patched to support areca raid) 2.6.18 64bit dom0, running 32bit PAE
domU's without any physical device access.
The machines are dual Quad Xeons equipped w/ 32G Ram and areca raid controller.

As I do not want to waste time building packages just to end up with this
strange error, could you please shed some light on me?

Thanks in advance


Shaun R. schrieb:
>> btw: I own a 3ware 9500 - so we use the same driver - 3w_9xxx - maybe
>> here
>> the problem starts...
> I run the 9560 controller and i patch is a newer driver provided by
> 3ware, i had to do this because 2.6.18 doesnt have support for the 9560
> controllers. There are some problems with Xen and 3wares drivers.  I
> also had a ML discussion going a while back because the latest driver
> for the 3ware controller would cause a kernel panic only with a Xen
> patched kernel, with a vanilla kernel it would work fine.  Keir also
> talked with me alittle about this but didnt really seam interested to
> hear or look into it futher.  I'm sure they are busy and i'm not
> positive that it was a problem with Xen it could have been a problem
> with the 3ware code.  It was only happening with the xen patches though
> so i figured they would want to have a look, 3ware is a popular
> controller these days...
> ~Shaun

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