Get blktap2 running on pvops.
Syncing blktap2/pvops with linux-2.6-xen. This queue merges a bunch of
blktap2 related changes from linux-2.6.18 into the pvops tree.
fix-git-c3a1cb06-vsyscall.diff # Fix x86_32 build after 
CONFIG_X86_VSYSCALL (c3a1cb06)
linux-2.6.18-xen.hg-885.a4b49dff3387.diff # blktap2: add tlb flush properly.
linux-2.6.18-xen.hg-887.85a4c18ad9aa.diff # blktap2: fix compiler warnings
linux-2.6.18-xen.hg-892.485fe5efa4ff.diff # blktap2: allow to build as module
linux-2.6.18-xen.hg-893.f994bfe9b93b.diff # blktap2: reduce TLB flush scope
linux-2.6.18-xen.hg-894.4e5cd2fc45a7.diff # blktap2: fix blkback/blktap2 
interaction
linux-2.6.18-xen.hg-896.f59c5daed527.diff # blktap2: use blk_rq_map_sg() here 
too
linux-2.6.18-xen.hg-913.b086278a4406.diff # blktap2: remove warnings.
linux-2.6.18-xen.hg-918.71a61b393cdf.diff # blkback: pagemap bug fixes
linux-2.6.18-xen.hg-960.5e08fff8dc05.diff # blktap2: properly __init-annotate 
blktap2 code
linux-2.6.18-xen.hg-962:0d9c11acc939.diff # blktap2: simplify address 
translations
cleanup-linux-2.6.18-xen.hg-918.diff # blkback: simplify 
linux-2.6.18-xen.hg-918.71a61b393cdf
Different from the filenames listed, results are far from
pristine. Where differences matter, comments went into the header.
I didn't test in detail which one are stricly required on pvops. But
least the tlb flushing updates apparently were a good idea.
These were all done all against xen/master @ 60e0545e
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