Re: [Xen-devel] [PATCH v2 2/8] tools: arm: report an error if the guest RAM is too large

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-04-25 at 12:50 +0100, Julien Grall wrote:
> Hi Ian,
> 
> On 25/04/14 12:22, Ian Campbell wrote:
> > Due to the layout of the guest physical address space we cannot support more
> > than 768M of RAM before overrunning the area set aside for the grant table. 
> > Due
> > to the presence of the magic pages at the end of the RAM region guests are
> > actually limited to 767M.
> >
> > Catch this case during domain build and fail gracefully instead of obscurely
> > later on.
> >
> > Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > ---
> > This is the only patch in this series which I consider to be suitable for
> > backporting to Xen 4.4
> 
> I agree with you. Without this the guest can crash with weird error.

I've found that it just hangs silently, which is even more frustrating.

> 
> For this patch:
> 
> Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>

Thanks.



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