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Re: [Embedded-pv-devel] [Xen-devel] [PATCH RFC 13/18] xen: introduce and use 'dom0_rambase_pfn' setting for kernel Dom0
- To: "Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxx>
- From: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
- Date: Mon, 23 May 2016 12:52:49 +0300
- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Steve Capper <Steve.Capper@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Andrii Anisov <andrii.anisov@xxxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxx>, "embedded-pv-devel@xxxxxxxxxxxxxxxxxxxx" <embedded-pv-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- Delivery-date: Mon, 23 May 2016 09:53:14 +0000
- List-id: <embedded-pv-devel.lists.xenproject.org>
Hi, Edgar.
On Fri, May 20, 2016 at 7:05 PM, Edgar E. Iglesias
<edgar.iglesias@xxxxxxxxx> wrote:
> Hi,
>
> We have similar needs (not exactly the same) in some of our setups.
> We need to map certain OCMs (On Chip Memories) to dom0. Among other things,
> these are used to communicate with remote accelerators/CPUs that have
> "hardcoded" addresses to these RAMs.
>
> Our approach is more along the lines of Juliens second suggestion. We're
> trying to use the mmio-sram DTS bindings to bring in these memories into
> dom0.
>
> IIUC the Ducati FW issue correctly, you need to allocate a chunk of DDR.
>
> Another possible solution:
> I think you could reserve the memory area by simply not mentioning it
> in the main memory node (these nodes support multiple ranges so you can
> introduce gaps). Then you could for example create an mmio-sram node to
> get the memory explicitely mapped 1:1 into dom0.
>
> Just a moment ago, I posted an RFC for the mmio-sram support to the list.
Thank You for advice.
I'll try to use Your solution.
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