lkml.org 
[lkml]   [2012]   [Jul]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    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 <Ian.Campbell@citrix.com> wrote:
    > On Fri, 2012-07-27 at 08:34 +0100, Jan Beulich wrote:
    >> >>> On 26.07.12 at 22:47, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 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).

    Jan



    \
     
     \ /
      Last update: 2012-07-27 13:01    [W:0.032 / U:0.124 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site