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    SubjectRe: [Xen-devel] [RFC PATCH] Boot PV guests with more than 128GB (v1) for 3.7
    >>> On 27.07.12 at 12:00, Ian Campbell <> wrote:
    > On Fri, 2012-07-27 at 08:34 +0100, Jan Beulich wrote:
    >> >>> On 26.07.12 at 22:47, Konrad Rzeszutek Wilk <> wrote:
    >> > 2). Allocate a new array, copy the existing P2M into it,
    >> > revector the P2M tree to use that, and return the old
    >> > P2M to the memory allocate. This has the advantage that
    >> > it sets the stage for using XEN_ELF_NOTE_INIT_P2M
    >> > feature. That feature allows us to set the exact virtual
    >> > address space we want for the P2M - and allows us to
    >> > boot as initial domain on large machines.
    >> And I would hope that the tools would get updated to recognize
    >> this note too, so that huge DomU-s would become possible as
    >> well.
    > Does this help us with >160GB 32 bit PV guests too? I'm guessing not
    > since the real limitation there is the relatively small amount of kernel
    > address space.

    Correct - 32-bit PV guests are limited anyway (and it's for a
    reason the Dom0 support in the hypervisor only deals with
    64-bit ones). And honestly, considering the huge page
    information table such a memory amount would require, I
    doubt this big a PV guest would even boot (or if it does, be
    of any use).


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