Re: [Xen-devel] DMA trouble with current xen-sparse

[Daniel Veillard <veillard@xxxxxxxxxx>]

On Thu, Nov 03, 2005 at 03:45:27AM +0100, Vincent Hanquez wrote:
> On Wed, Nov 02, 2005 at 06:04:25PM -0500, Daniel Veillard wrote:
> >   I'm not a kernel hacker, but if you give me a patch displaying those
> > informations at the IOMMU_BUG_ON pointed by Steven, I will gladly rebuild 
> > and try to reboot over it to give you the informations (I have no serial
> > so hint on avoiding the instant reboot of the dom0 would help). Oh yeah
> > it's just dom0 on top of the hypervisor, no domU even started.
> 
> Hi Daniel,

  Hi, Salut :-)

> could you try the following patch just to have a bit more information
> about the pointer and the size ?
[...]
> stick a while (1) ; after the printk would help you to avoid the reboot
> something like:

Sure, took a bit of time to recompile the kernel (I didn't do this for years)
and it crashed as expected, here are the info:

  ptr: f160ed8e 1514

the size looks a full ethernet frame, i.e. 1500 of payload, 2 ethernet
addresses and the 2bytes for the ethernet type, that looks kosher to me
but clearly it is not aligned.

Daniel

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