Re: [Xen-devel] Xen Kernel (3.0.2) breaks b44 module

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 12 May 2006, at 19:27, Chris Wright wrote:

> > When we support more flexible allocation in Xen, we'll fix up the
> > swiotlb to automatically try to grab some lower memory and/or allow 
> > the
> > address mask for the physical memory in the swiotlb to be specified on
> > the kernel command line.
> What's the plan here?  I've seen a few bug reports due to 28-bit device
> limitations (sound cards).
Memory below 16MB isn't going to happen, at least on 32-bit Xen. It'd 
be easier on 64-bit Xen as we don't need separate notions of Xen heap 
and guest heap. We could support pretty much anything more than 24 bits 
though. It's just a case of making the Xen buddy allocator more 
flexible and keep separate buddy lists for different address widths. If 
we fix for things like b4400, we should be fixed for the crappy sound 
cards too.
 -- Keir


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