[Qemu-devel] [PATCH RFC 0/5] Xen: introduce Xen PV target

[Wei Liu <wei.liu2@citrix.com>]

As promised I hacked a prototype based on Paolo's disable TCG series.
However I coded some stubs for TCG anyway. So this series in principle
should work with / without Paolo's series.

The first 3 patches refactor some code to disentangle Xen PV and HVM
guest. The 4th patch has the real meat. It introduces Xen PV target,
which contains basically a dummy CPU, then hooks up this Xen PV CPU to
QEMU internal structures.

The last patch introduces xenpv-softmmu, which contains *no* emulation
code. I know that in previous discussion people said that every device
emulation should be included if the target architecture is called null.
But since this target CPU is now called xenpv I don't feel obliged to
include any device emulation in this prototype anymore. :-)

Please note that the existing Xen QEMU build is not affected at all. You
can still use "--disable-tcg --enable-xen --target-list=i386-softmmu"
(or x86_64-softmmu") to build qemu-system-{i386,x86_64} and use it for
both HVM and PV guest. This series adds another option to build QEMU with
"--disable-tcg --enable-xen --target-list=xenpv-softmmu" and get a QEMU
binary tailored for Xen PV guest. The effect is that we reduce the
binary size from 14MB to 7.3MB.

What do you think of this idea? I'm all ears.

Wei.

Wei Liu (5):
  xen: move Xen PV machine files to hw/xenpv
  xen: factor out common functions
  exec: guard Xen HVM hooks with CONFIG_XEN_I386
  xen: implement Xen PV target
  xen: introduce xenpv-softmmu.mak

 Makefile.target                      |    3 +-
 arch_init.c                          |    2 +
 configure                            |   12 ++-
 cpu-exec.c                           |    2 +
 default-configs/i386-softmmu.mak     |    1 -
 default-configs/x86_64-softmmu.mak   |    1 -
 default-configs/xenpv-softmmu.mak    |    2 +
 exec.c                               |   16 ++++
 hw/i386/Makefile.objs                |    2 +-
 hw/xenpv/Makefile.objs               |    2 +
 hw/{i386 => xenpv}/xen_domainbuild.c |    0
 hw/{i386 => xenpv}/xen_domainbuild.h |    0
 hw/{i386 => xenpv}/xen_machine_pv.c  |    0
 include/exec/memory-internal.h       |    2 +
 include/sysemu/arch_init.h           |    1 +
 target-xenpv/Makefile.objs           |    1 +
 target-xenpv/cpu-qom.h               |   64 ++++++++++++++++
 target-xenpv/cpu.h                   |   66 ++++++++++++++++
 target-xenpv/helper.c                |   32 ++++++++
 target-xenpv/translate.c             |   27 +++++++
 xen-common.c                         |  137 ++++++++++++++++++++++++++++++++++
 xen-all.c => xen-hvm.c               |  112 +--------------------------
 xen-stub.c                           |    4 -
 23 files changed, 368 insertions(+), 121 deletions(-)
 create mode 100644 default-configs/xenpv-softmmu.mak
 create mode 100644 hw/xenpv/Makefile.objs
 rename hw/{i386 => xenpv}/xen_domainbuild.c (100%)
 rename hw/{i386 => xenpv}/xen_domainbuild.h (100%)
 rename hw/{i386 => xenpv}/xen_machine_pv.c (100%)
 create mode 100644 target-xenpv/Makefile.objs
 create mode 100644 target-xenpv/cpu-qom.h
 create mode 100644 target-xenpv/cpu.h
 create mode 100644 target-xenpv/helper.c
 create mode 100644 target-xenpv/helper.h
 create mode 100644 target-xenpv/translate.c
 create mode 100644 xen-common.c
 rename xen-all.c => xen-hvm.c (92%)

-- 
1.7.10.4