Re: [Xen-devel] [PATCH v5 8/8] xen: arm: allocate more than one bank for 1:1 domain 0 if needed

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 07/09/2014 01:07 PM, Ian Campbell wrote:
> Depending on where Xen and the initial modules were loaded into RAM we may not
> be able to allocate a suitably contiguous block of memory for dom0. Especially
> since the allocations made by alloc_domheap_pages are naturally aligned (e.g. 
> a
> 1GB allocation must be at a 1GB boundary).
> 
> The alignment requirement in particular is a huge limitation, meaning that 
> even
> dom0_mem0=1G on a 2GB system is pretty likely to fail unless you are very
> careful with your load addresses. People were also having trouble with dom0 >
> 128MB on the 1GB cubieboard2 when using fairly standard load addresses for
> things.
> 
> This patch tries to allocate multiple banks of memory in order to try and
> satisfy the entire requested domain 0 allocation. Sadly this turns out to be
> pretty tricky to arrange (see the large comment in the code).
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>

Regards,

-- 
Julien Grall

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