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[Xen-devel] [PATCH 0 of 7] Fix kexec in Xen (take 4)

This set of patches are partly bugfixed to problems I have noticed while 
working on this area of the codebase, and targeted fixes to get the kexec path 
working again on Xen 4.x

The first three patches are small bugfixes which are not directly related to 
the kexec problems, but are on the codepath.

The next four patches are directly related to fixing the kexec path.

These patches cause xen to track the BSP local APIC boot state and return to it 
before kexec'ing to a new kernel.  This prevents the kdump kernel falling over 
itself when booting in x2apic mode while expecting to be in xapic mode.

It also makes sure to disable IO virtualisation, along with fixing the current 
codepath related to disabling Interrup Remapping on Intel VTD boxes.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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