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Re: [Xen-devel] Question about DMA on 1:1 mapping dom0 of arm64

To: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
From: Ian Campbell <ian.campbell@xxxxxxxxxx>
Date: Fri, 17 Apr 2015 15:38:13 +0100
Cc: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, Chen Baozi <cbz@xxxxxxxxxx>, julien.grall@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxx
Delivery-date: Fri, 17 Apr 2015 14:38:26 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Fri, 2015-04-17 at 15:32 +0100, Stefano Stabellini wrote:
> I think that given that dom0 is mapped 1:1 on ARM, the easiest and best
> fix would be to simply allocate memory under 4G to begin with.

Not necessarily best, see my reply (hint: dom0 might not have RAM under
4GB even if the host does).



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References:
- [Xen-devel] Question about DMA on 1:1 mapping dom0 of arm64
  - From: Chen Baozi
- Re: [Xen-devel] Question about DMA on 1:1 mapping dom0 of arm64
  - From: Stefano Stabellini

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