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

[David Vrabel <david.vrabel@citrix.com>]

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.

David