Re: [Qemu-devel] [RFC v6 06/14] configure: Use slow-path for atomic only when the softmmu is enabled

[Paolo Bonzini <pbonzini@redhat.com>]

On 15/12/2015 15:23, alvise rigo wrote:
> Hi,
> 
> On Mon, Dec 14, 2015 at 11:14 AM, Laurent Vivier <lvivier@redhat.com> wrote:
>>
>>
>> On 14/12/2015 09:41, Alvise Rigo wrote:
>>> Use the new slow path for atomic instruction translation when the
>>> softmmu is enabled.
>>>
>>> Suggested-by: Jani Kokkonen <jani.kokkonen@huawei.com>
>>> Suggested-by: Claudio Fontana <claudio.fontana@huawei.com>
>>> Signed-off-by: Alvise Rigo <a.rigo@virtualopensystems.com>
>>> ---
>>>  configure | 4 ++++
>>>  1 file changed, 4 insertions(+)
>>>
>>> diff --git a/configure b/configure
>>> index b9552fd..cc3891a 100755
>>> --- a/configure
>>> +++ b/configure
>>> @@ -4794,6 +4794,7 @@ echo "Install blobs     $blobs"
>>>  echo "KVM support       $kvm"
>>>  echo "RDMA support      $rdma"
>>>  echo "TCG interpreter   $tcg_interpreter"
>>> +echo "use ld/st excl    $softmmu"
>>>  echo "fdt support       $fdt"
>>>  echo "preadv support    $preadv"
>>>  echo "fdatasync         $fdatasync"
>>> @@ -5186,6 +5187,9 @@ fi
>>>  if test "$tcg_interpreter" = "yes" ; then
>>>    echo "CONFIG_TCG_INTERPRETER=y" >> $config_host_mak
>>>  fi
>>> +if test "$softmmu" = "yes" ; then
>>> +  echo "CONFIG_TCG_USE_LDST_EXCL=y" >> $config_host_mak
>>> +fi
>>
>> why is this "$softmmu" and not "$target_softmmu" ?
> 
> I see now that is $target_softmmu setting CONFIG_SOFTMMU=y.
> So for my understanding, which are the cases where $softmmu is set
> while $target_softmmu is not?

When compiling foo-linux-user.

Paolo