Re: [Xen-ia64-devel] I cannot create domU anymore

[tgingold@xxxxxxx]

Quoting Tristan Gingold <tgingold@xxxxxxx>:

> On Sun, Jun 17, 2007 at 08:43:37AM -0600, Alex Williamson wrote:
> > On Sun, 2007-06-17 at 07:59 +0200, Tristan Gingold wrote:
> > > Hi,
> >    That's coming from the swiotlb code.  By default a domU will use the
> > xen machine vector, which relies on xen_dma instead of swiotlb for DMA.
> > However, if you boot a domU with machvec=dig it will make use of the
> > swiotlb.  This works for me, but is really only useful if you're running
> > driver domains with 32bit devices, which isn't really recommended.
> > Could that be the case?  Unfortunately there's a limited amount of
> > memory below 4G for xen to remap.  Maybe the default size of the swiotlb
> > should be smaller if running in a domU?  Thanks,
>
> Thank you for the info.
> I didn't add any machvec= option and I don't try to run a driver domain.
> I will try to understand whu swiotlb is used instead of xen_dma.

BTW I think I have configure my kernel for DIG only and that may be the root of
the problem.

Thank you for having pointed this to me.  I haven't carefully followed the
DMA/swiotlb issues and now I think I should have.

Tristan.

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