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    SubjectRe: [PATCH 08/10] xen/mmu: Bugfix. Fill the top entry page with appropriate middle layer pointers.
    On Tue, Dec 21, 2010 at 02:38:30PM -0800, Jeremy Fitzhardinge wrote:
    > On 12/21/2010 01:37 PM, Konrad Rzeszutek Wilk wrote:
    > > If we swapped over from using an p2m_mid_identical to p2m_mid_missing
    > > (earlier call to set_phys_to_machine) and then started going through the
    > > PFNs in descending order to program a new MFN (balloon worker), we would
    > > end up in this code path. At that point we would set up new page filled with
    > > pointers to p2m_identity instead of p2m_missing. This had the disastrous
    > > effect that get_phys_to_machine on that PFN would return an 1-1 mapping
    > > instead of INVALID_P2M_ENTRY resulting in hitting a BUG check in balloon driver.
    > >
    > Are you going to fold this into the appropriate patch later?

    Yes. Rolled it in
    xen/mmu: Add the notion of identity (1-1) mapping.



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