Re: [Xen-devel] [PATCH][XEN] construct_dom0: Initialize variable before use

["Christoph Egger" <Christoph.Egger@xxxxxxx>]

Great, thanks! I just can't test the removal of the 166GB RAM limit :-)

Christoph


On Thursday 06 December 2007 14:39:51 Keir Fraser wrote:
> Changeset 16548.
>
>  -- Keir
>
> On 29/11/07 13:02, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote:
> > Hi!
> >
> > Attached patch initializes d->arch.physaddr_bitsize properly for a
> > 64bit Dom0/64bit hypervisor.
> > This bug has been found when booting a NetBSD/Xen Dom0 with more
> > than 4GB RAM.
> >
> > Without this fix, d->arch.physaddr_bitsize is 0 in
> > domain_clamp_alloc_bitsize(). This causes all attempts to
> > XENMEM_increase_reservation with bits > 0 to fail. More precisely,
> > __alloc_domheap_pages() returns NULL.
> > This impacts Xen heap allocation in general.
> > Question: How did that work on Linux Dom0?
> >
> > I think, initializing physaddr_bitsize to 64 unconditionally is ok
> > because in construct_dom0() it is overridden with the proper value when
> > you boot 64bit hypervisor with a 32bit Dom0. If the hypervisor is not
> > 64bit, physaddr_bitsize isn't used at all anyway.
> >
> > Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>



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