Xen kernel fixes

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Hi,

I have made the for-centos-v5 branch available on

git://xenbits.xen.org/people/dvrabel/linux.git

This is based on 3.4.54 and includes the following additional fixes
(since the for-centos-v4 branch).

* x86/xen: during early setup, only 1:1 map the ISA region

Fixes a boot failure if tboot is used.

* xen/evtchn: avoid a deadlock when unbinding an event channel

Fixes a potential deadlock by users (e.g., qemu, xenstored) of
/dev/xen/evtchn.

You may also wish to consider enabling
CONFIG_XEN_BALLOON_MEMORY_HOTPLUG.  The kernel bug that was causing
problems is already fixed (by xen/balloon: Subtract from
xen_released_pages the count that is populated) and now that dom0 will
not try to auto-balloon by default, enabling this option should no
longer cause problems in dom0.

This option is required to increase the amount of memory in a guest
using this kernel above the initial amount.

David
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