Description of problem:
Fixes include:

1. pc: drop external DSDT loading

    This breaks migration and is unneeded with modern SeaBIOS.

2. migration: don't use uninitialized variables

    The qmp_migrate method uses the 'blk' and 'inc' parameter without
    checking if they're valid or not (they may be uninitialized if
    command is received via QMP)

3.migration: send total time in QMP at "completed" stage

   The "completed" stage sets total_time but not has_total_time and
    thus it is not sent via QMP reply (but sent via HMP nevertheless)
 
4. migration: fix spice migration

    Commit 29ae8a4133082e16970c9d4be09f4b6a15034617 ("rdma: introduce
    MIG_STATE_NONE and change MIG_STATE_SETUP state transition") changed the
    state transitions during migration setup.
    
    Spice used to be notified with MIG_STATE_ACTIVE and it detected this
    using migration_is_active().  Spice is now notified with
    MIG_STATE_SETUP and migration_is_active() no longer works.
    
    Replace migration_is_active() with migration_in_setup() to fix spice
    migration.
 
5. migration: notify migration state before starting thread
    
    The migration thread runs outside the QEMU global mutex when possible.
    Therefore we must notify migration state change *before* starting the
    migration thread.
    
    This allows registered listeners to act before live migration iterations
    begin.  Therefore they can get into a state that allows for live
    migration.  When the migration thread starts everything will be ready.
    
    Without this patch there is a race condition during migration setup,
    depending on whether the migration thread has already transitioned from
    SETUP to ACTIVE state.
    
    Acked-by: Paolo Bonzini <pbonzini>
    Reviewed-by: Kevin Wolf <kwolf>
    Signed-off-by: Stefan Hajnoczi <stefanha>


6. target-i386: Disable PMU CPUID leaf by default
    
    Bug description: QEMU currently gets all bits from GET_SUPPORTED_CPUID
    for CPUID leaf 0xA and passes them directly to the guest. This makes
    the guest ABI depend on host kernel and host CPU capabilities, and
    breaks live migration if we migrate between hosts with different
    capabilities (e.g., different number of PMU counters).
    
    Add a "pmu" property to X86CPU, and set it to true only on "-cpu host",
    or on pc-*-1.5 and older machine-types.
    
    For now, setting pmu=on will enable the current passthrough mode that
    doesn't have any ABI stability guarantees, but in the future we may
    implement a mode where the PMU CPUID bits are stable and configurable.
    
    Signed-off-by: Eduardo Habkost <ehabkost>
    Cc: Paolo Bonzini <pbonzini>
    Signed-off-by: Andreas Färber <afaerber>

7. migration: add autoconvergence documentation
    
    This hunk got lost during merge.  It is documentation.

8. Fix real mode guest segments dpl value in savevm
    
    Older KVM version put invalid value in the segments registers dpl field
    for
    real mode guests (0x3).
    This breaks migration from those hosts to hosts with unrestricted guest
    support.
    We detect it by checking CS dpl value for real mode guest and fix the dpl
    values
    of all the segment registers.
    
9. Fix real mode guest migration
    
    Older KVM versions save CS dpl value to an invalid value for real mode
    guests
    (0x3). This patch detect this situation when loading CPU state and set
    all the
    segments dpl to zero.
    This will allow migration from older KVM on host without unrestricted
    guest
    to hosts with restricted guest support.
    For example migration from a Penryn host (with kernel 2.6.32) to
    a Westmere host (for real mode guest) will fail with "kvm: unhandled exit
    80000021".


10. block-migration: efficiently encode zero blocks
    
    this patch adds a efficient encoding for zero blocks by
    adding a new flag indicating a block is completely zero.
    
    additionally bdrv_write_zeros() is used at the destination
    to efficiently write these zeroes. depending on the implementation
    this avoids that the destination target gets fully provisioned.
    
    Signed-off-by: Peter Lieven <pl>
    Signed-off-by: Stefan Hajnoczi <stefanha>

11. block/raw: add bdrv_co_write_zeroes
    
12. block: add bdrv_write_zeroes()

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