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    Subject[PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high'
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    In a couple of days I thinking to ask Linus to pull this branch:

    git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/bug-fixes-for-rc5

    Which as two fixes that fix a bootup (Linux can't boot under Xen
    at all) regression introduced by "x86-64, mm: Put early page table high"
    (git commit 4b239f458c229de044d6905c2b0f9fe16ed9e01e). Stefano
    and Yinghai have been working on patches fixing this regression
    when the patch was still in x86/mm-core before the 2.6.39 merge window openned.

    But we haven't come up with an acceptable general solution yet, so this
    patchset provides a workaround for the problem. Peter, Yinghai - what would be
    the best forum/email/conference to hammer out a general solution for this?

    Currently, there are couple of ways of fixing this:
    - use pvops hooks: http://marc.info/?i=1302607192-21355-2-git-send-email-stefano.stabellini@eu.citrix.com
    - have a workaround in Xen MMU's early bootup code (which is what these
    two patches to this email have).
    - or remove the patch introducing the regression altogether.

    Foremost important is to fix the regression, and attached patches
    achieve that. I want to remove this workaround patch when we
    hammer out more appropriate semantics for the page table creation - but
    that will take some time and the runway to do that in 2.6.39 is gone.

    Konrad Rzeszutek Wilk (1):
    xen/mmu: Add workaround "x86-64, mm: Put early page table high"

    Stefano Stabellini (1):
    xen: mask_rw_pte mark RO all pagetable pages up to pgt_buf_top

    arch/x86/xen/mmu.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++-
    1 files changed, 124 insertions(+), 1 deletions(-)


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