Re: [PATCH V2 0/3] xen: remove some memory limits from pv-domains

[Juergen Gross]

On 09/17/2014 04:43 PM, David Vrabel wrote:
> On 17/09/14 05:12, Juergen Gross wrote:
> > When a Xen pv-domain is booted the initial memory map contains multiple
> > objects in the top 2 GB including the initrd and the p2m list. This
> > limits the supported maximum size of the initrd and the maximum
> > memory size the p2m list can span is limited to about 500 GB.
> >
> > Xen however supports loading the initrd without mapping it and the
> > initial p2m list can be mapped by Xen to an arbitrary selected virtual
> > address. The following patches activate those options and thus remove
> > the limitations.
> >
> > It should be noted that the p2m list limitation isn't only affecting
> > the amount of memory a pv domain can use, but it also hinders Dom0 to
> > be started on physical systems with larger memory without reducing it's
> > memory via a Xen boot parameter. By mapping the initial p2m list to
> > an area not in the top 2 GB it is now possible to boot Dom0 on such
> > systems.
> >
> > It would be desirable to be able to use more than 512 GB in a pv
> > domain, but this would require a reorganization of the p2m tree built
> > by the kernel at boot time. As this reorganization would affect the
> > Xen tools and kexec, too, it is not included in this patch set. This
> > topic can be addressed later.
> >
> > Juergen Gross (3):
> >    xen: sync some headers with xen tree
> >    xen: eliminate scalability issues from initrd handling
>
> I've applied these two to devel/for-linus-3.18.
>
> Thanks.

Thanks, too. :-)


Juergen

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