[Qemu-devel] [PATCH 00/15] add disable-tcg option for x86 build

[Yang Zhong]

This patchset rebased from Paolo's below patchset, which was based on
QEMU 2.0.50 version. 
https://github.com/bonzini/qemu/tree/disable-tcg

Since qemu-system-x86_64 enabled kvm and TCG accelators by default, in 
fact, the TCG accelator is NOT useful in the system build of x86 platform. 
This patchset will disable TCG for x86 platform if --disable-tcg option is 
added into ./configure command.

The new configure build command like below
(1)./configure
   tcg is enabled by default

(2)./configure --disable-tcg
   tcg is disabled in i386 and x86_64 softmmu build
   tcg is enabled in others softmmu and all users build

(3)./configure --disable-tcg --target-list=x86_64-softmmu, x86_64-linux-user
   tcg is disabled in x86_64 softmmu build
   tcg is enabled in x86_64 linux user build 

How to verify disable-tcg option
(1)./configure
   a)all user and softmmu build are okay.
   b) CONFIG_TCG=y is set in $config_target_mak in all user and softmmu 
directory
   c)kvm starting vm is okay
     ./qemu-system-x86_64 -enable-kvm -cpu host -m 2G -smp 
cpus=4,cores=4,threads=1,\
       sockets=1 -drive format=raw,file=eywa.img,index=0,media=disk -nographic 
-serial \
       stdio -nodefaults
   d)tcg starting vm is okay
     ./qemu-system-x86_64 -m 2G -smp cpus=4,cores=4,threads=1,sockets=1 -drive 
format=raw,\
        file=eywa.img,index=0,media=disk -nographic -serial stdio -nodefaults

(2) ./configure --disable-tcg  
   a) all user and softmmu build are okay.
   b) CONFIG_TCG=y is not set in $config_target_mak in i386_softmmu and 
x86_64-softmmu 
      directory
   c) kvm starting vm is okay
     ./qemu-system-x86_64 -enable-kvm -cpu host -m 2G -smp 
cpus=4,cores=4,threads=1,\
       sockets=1 -drive format=raw,file=eywa.img,index=0,media=disk -nographic 
-serial \
       stdio -nodefaults
   d) tcg starting vm is aborted
      The log as below:
      "tcg" accelerator not found.
      No accelerator found!


Yang Zhong (15):
  configure: add the disable-tcg option
  vl: add CONFIG_TCG for tcg related code
  tcg: tcg_handle_interrupt() function
  tcg: change tcg_enabled()
  tcg: move page_size_init() function
  kvmvapic: remove tcg related code
  tcg: move cpu_sync_bndcs_hflags() function
  tcg: make cpu_get_fp80()/cpu_set_fp80() static
  tcg: add the tcg-stub.c file into accel/stubs/
  tcg: move tb related lock functions
  tcg: split cpu_set_mxcsr()/cpu_set_fpuc()
  tcg: remove inline definition of flush_icache_range()
  tcg: disable tcg in CPUX86State struct
  tcg: add the CONFIG_TCG for header
  tcg: add the CONFIG_TCG into Makefiles

 Makefile.target              |   4 +-
 accel/Makefile.objs          |   2 +-
 accel/stubs/Makefile.objs    |   1 +
 accel/stubs/tcg-stub.c       | 129 +++++++++++++++++++++++++++++++++++++++++++
 accel/tcg/Makefile.objs      |   2 +-
 accel/tcg/cpu-exec.c         |   1 +
 accel/tcg/cputlb.c           |   1 +
 accel/tcg/tcg-all.c          |   2 +-
 accel/tcg/translate-all.c    |  54 ++++++++++--------
 accel/tcg/translate-all.h    |   3 +
 accel/tcg/translate-common.c |  56 -------------------
 bsd-user/main.c              |   1 +
 configure                    |  28 +++++++++-
 cpus.c                       |   4 +-
 exec.c                       |  20 +++++++
 hw/i386/kvmvapic.c           |  24 --------
 include/exec/cpu-defs.h      |   4 +-
 include/exec/cputlb.h        |   2 +-
 include/exec/exec-all.h      |  53 +++++++++---------
 include/exec/helper-proto.h  |   2 +
 include/qemu-common.h        |   7 ++-
 linux-user/main.c            |   2 +-
 target/i386/Makefile.objs    |   7 ++-
 target/i386/cpu.h            |  22 ++++++--
 target/i386/fpu_helper.c     |  26 +--------
 target/i386/helper.c         |  34 +++++++++++-
 target/i386/machine.c        |  18 ++++++
 target/i386/mpx_helper.c     |  30 ----------
 tcg/i386/tcg-target.h        |   5 +-
 tcg/i386/tcg-target.inc.c    |   4 ++
 tcg/tcg.h                    |   4 --
 trace/control-target.c       |   1 -
 vl.c                         |  12 ++++
 33 files changed, 356 insertions(+), 209 deletions(-)
 create mode 100644 accel/stubs/tcg-stub.c
 delete mode 100644 accel/tcg/translate-common.c

-- 
1.9.1