fixup kernel core dumps on paravirtual guests

Merge from head

Merge from head up to r188941 (last revision before the USB stack switch)

- MFC from head@196987

add core dump support to blkfront

Obtained from: Frank Suchomel

- MFC

update backend_changed to reflect .m prototype

Update the projects tree to a newer FreeBSD current.

Merge in support for Xen HVM on amd64 architecture.

merge 186535, 186537, and 186538 from releng_7_xen

Log:
- merge in latest xenbus from dfr's xenhvm
- fix race condition in xs_read_reply by converting tsleep to mtx_sleep

Log:
unmask evtchn in b

merge 186535, 186537, and 186538 from releng_7_xen

Log:
- merge in latest xenbus from dfr's xenhvm
- fix race condition in xs_read_reply by converting tsleep to mtx_sleep

Log:
unmask evtchn in bind_{virq, ipi}_to_irq

Log:
- remove code for handling case of not being able to sleep
- eliminate tsleep - make sleeps atomic

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integrate from head@185615

Integrate 185578 from dfr
Use newbus to managed devices

Update xen/interface includes to the latest in mercurial

MFC after: 1 month

Evidently the block device starts at 767.

MFC after: 1 month

make block devices start at 0

mark blkfront_info as ready

MFC after: 1 month

Make sure that machine addresses are vm_paddr_t

MFC after: 1 month

Import Xen paravirtual drivers.

MFC after: 2 weeks

Merge from head at r201628.

# This hasn't been tested, and there are at least three bad commits
# that need to be backed out before the branch will be stable again.

In blkif_queue_cb(), test the return value from gnttab_claim_grant_reference()
for >= 0 instead of != ENOSPC.

Correct alignment and boundary constraints in blkfront's bus dma tag. The
blkif interface in Xen requires all I/O to be 512 byte aligned with each
segment bounded by a 4k page.

Note: This submissio

Correct alignment and boundary constraints in blkfront's bus dma tag. The
blkif interface in Xen requires all I/O to be 512 byte aligned with each
segment bounded by a 4k page.

Note: This submission only documents the proper contraints for blkif I/O.
The alignment code in busdma does not yet handle alignment constraints
correctly in all cases.

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Merge Scott Long's latest blkfront now that the licensing issues are resolved

Update license to reflect terms in xen 2.0 as of the time when the driver was ported
to FreeBSD

fixup kernel core dumps on paravirtual guests

- MFC from head@196987