Re: [Xen-devel] [PATCH v5 8/9] tools: arm: support up to (almost) 1TB of guest RAM

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 22/05/14 10:46, Ian Campbell wrote:
> This creates a second bank of RAM starting at 8GB and potentially
> extending to the 1TB boundary, which is the limit imposed by our
> current use of a 3 level p2m with 2 pages at level 0 (2^40 bits).
>
> I've deliberately left a gap between the two banks just to
> exercise those code paths.
>
> The second bank is 1016GB in size which plus the 3GB below 4GB is
> 1019GB maximum guest RAM. At the point where the fact that this
> is slightly less than a full TB starts to become an issue for
> people then we can switch to a 4 level p2m, which would be needed
> to support guests larger than 1TB anyhow.
>
> Tested on 32-bit with 1, 4 and 6GB guests. Anything more than
> ~3GB requires an LPAE enabled kernel, or a 64-bit guest.
>
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>


--
Julien Grall

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