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Re: [Xen-devel] x86 swiotlb questions

To: Jan Beulich <jbeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] x86 swiotlb questions
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 23 Dec 2006 08:00:35 +1100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir@xxxxxxxxxxxxx>
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On Fri, Dec 22, 2006 at 04:20:28PM +0000, Jan Beulich wrote:
> One more thing: Is it really necessary to restrict dma_alloc_coherent() to 
> dma_bits?
> I.e., couldn't we, once the bit-level page allocator is merged, use the real 
> bit width
> needed for the requesting device here? If not, this would then permit using 
> the

Yes I think that should work.  If the width is less than what the
hypervisor supports it'll simply fail which is better than returning
the wrong memory silently.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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