[Xen-devel] [PATCH v4 00/17] x86/hvm: I/O emulation cleanup and fix

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

This patch series re-works much of the code involved in emulation of port
and memory mapped I/O for HVM guests.

The code has become very convoluted and, at least by inspection, certain
emulations will apparently malfunction.

The series is broken down into 17 patches (which are also available in
my xenbits repo: http://xenbits.xen.org/gitweb/?p=people/pauldu/xen.git
on the emulation27 branch) as follows:

0001-x86-hvm-simplify-hvmemul_do_io.patch
0002-x86-hvm-remove-hvm_io_pending-check-in-hvmemul_do_io.patch
0003-x86-hvm-remove-extraneous-parameter-from-hvmtrace_io.patch
0004-x86-hvm-remove-multiple-open-coded-chunking-loops.patch
0005-x86-hvm-re-name-struct-hvm_mmio_handler-to-hvm_mmio_.patch
0006-x86-hvm-unify-internal-portio-and-mmio-intercepts.patch
0007-x86-hvm-add-length-to-mmio-check-op.patch
0008-x86-hvm-unify-dpci-portio-intercept-with-standard-po.patch
0009-x86-hvm-unify-stdvga-mmio-intercept-with-standard-mm.patch
0010-x86-hvm-revert-82ed8716b-fix-direct-PCI-port-I-O-emu.patch
0011-x86-hvm-only-call-hvm_io_assist-from-hvm_wait_for_io.patch
0012-x86-hvm-split-I-O-completion-handling-from-state-mod.patch
0013-x86-hvm-remove-HVMIO_dispatched-I-O-state.patch
0014-x86-hvm-remove-hvm_io_state-enumeration.patch
0015-x86-hvm-use-ioreq_t-to-track-in-flight-state.patch
0016-x86-hvm-always-re-emulate-I-O-from-a-buffer.patch
0017-x86-hvm-track-large-memory-mapped-accesses-by-buffer.patch

v2:
 - Removed bogus assertion from patch 16
 - Re-worked patch #17 after basic testing of back-port onto XenServer

v3:
 - Addressed comments from Jan
 - Re-ordered series to bring a couple of more trivial patches to the
   front
 - Backport to XenServer (4.5) now passing automated tests
 - Tested on unstable with QEMU upstream and trad, with and without
   HAP (to force shadow emulation)

v4:
 - Removed previous patch #4 (make sure translated MMIO reads or
   writes fall within a page) and rebased rest of series.
 - Address Jan's comments on prevous patch #5 (now patch #4)

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