Re: [Xen-devel] [PATCH] xl, e820_host, PV passthrough: Fix guests crashing when memory == maxmem

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-05-24 at 14:58 +0100, Ian Campbell wrote:
> On Fri, 2013-05-24 at 09:36 -0400, Konrad Rzeszutek Wilk wrote:
> > The code had an obvious bug where it would assume that the balloon
> > amount would always be _something_ and add an E820_RAM entry at the
> > end of the E820 array. The added E820_RAM would contain the balloon amount
> > plus the delta of memory that had to be subtracted b/c of the various
> > E820 entries. That assumption is certainly true when maxmem != mem,
> > but if guest config has maxmem = memory that is incorrect (as balloon
> > value is zero). The end result is that the E820 that is constructed
> > is missing a swath of "delta" memory and in most cases ends up with
> > only one E820_RAM entry that is of 512MB size on many Intel systems.
> > 
> > Reported-by: Christian Holpert <christian@xxxxxxxxxx>
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> 
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

And applied.



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